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Added/Updated tests\functional\transactions\test_read_consist_sttm_restart_on_delete_02.py: one more re-implementing in order to prevent raises and get execution order predictable. See notes.
This commit is contained in:
pavel-zotov
parent
3ba2df6b63
commit
d36db9712a
@ -115,34 +115,58 @@ DESCRIPTION:
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NOTE: concrete values of fields TRN, GLOBAL_CN and SNAP_NO in the TLOG_DONE can differ from one to another run!
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This is because of concurrent nature of connections that work against database. We must not assume that these values will be constant.
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################
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Checked on 4.0.0.2144 SS/CS
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FBTEST: functional.transactions.read_consist_sttm_restart_on_delete_02
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NOTES:
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[28.07.2022] pzotov
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Checked on 4.0.1.2692, 5.0.0.591
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[23.09.2023] pzotov
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Replaced verification method of worker attachment presense (which tries DML and waits for resource).
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This attachment is created by *asynchronously* launched ISQL thus using of time.sleep(1) is COMPLETELY wrong.
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Loop with query to mon$statements is used instead (we search for record which SQL_TEXT contains 'special tag', see variable SQL_TAG_THAT_WE_WAITING_FOR).
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Maximal duration of this loop is limited by variable 'MAX_WAIT_FOR_WORKER_START_MS'.
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Many thanks to Vlad for suggestions.
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[25.09.2023] pzotov
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1. Added trace launch and its parsing in order to get number of times when WORKER statement did restart.
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See commits:
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1) FB 4.x (23-JUN-2022, 4.0.2.2782): https://github.com/FirebirdSQL/firebird/commit/95b8623adbf129d0730a50a18b4f1cf9976ac35c
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2) FB 5.x (27-JUN-2022, 5.0.0.555): https://github.com/FirebirdSQL/firebird/commit/f121cd4a6b40b1639f560c6c38a057c4e68bb3df
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Trace must contain several groups, each with similar lines:
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<timestamp> (<trace_memory_address>) EXECUTE_STATEMENT_RESTART
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{SQL_TO_BE_RESTARTED}
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Restarted <N> time(s)
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2. To prevent raises between concurrent transactions, it is necessary to ensure that code:
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* does not allow LOCKER-2 to start its work until WORKER session will establish connection and - moreover - will actually locks first record
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from the scope that is seen by the query that we want to be executed by worker.
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* does not allow LOCKER-1 to do something after LOCKER-2 issued commit (and thus released record): we first have to ensure that this record
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now is locked by WORKER. The same when record was occupied by LOCKER-2 and then is released: LOCKER-1 must not do smth until WORKER will
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encounter this record and 'catch' it.
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This is done by calls to function 'wait_for_record_become_locked()' which are performed by separate 'monitoring' connection with starting Tx
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with NO_WAIT mode and catching exception with further parsing. In case when record has been already occupied (by WORKER) this exception will
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have form "deadlock / -update conflicts ... / -concurrent transaction number is <N>". We can then obtain number of this transaction and query
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mon$statements for get MON$SQL_TEXT that is runnig by this Tx. If it contains contains 'special tag' (see variable SQL_TAG_THAT_WE_WAITING_FOR)
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then we can be sure that WORKER really did establish connection and successfully locked row with required ID.
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Table 'TLOG_WANT' (which is fulfilled by trigger TEST_BIUD using in autonomous tx) can NOT be used for detection of moments when WORKER
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actually locks records which he was waiting for: this trigger fires BEFORE actual updating occurs, i.e. when record become seeon by WORKER
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but is still occupied by some LOCKER ("[DOC]: c) engine continue to evaluate remaining records ... and put write locks on it too")
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NB! Worker transaction must running in WAIT mode - in contrary to Tx that we start in our monitoring loop.
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Checked on WI-T6.0.0.48, WI-T5.0.0.1211, WI-V4.0.4.2988.
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"""
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import subprocess
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import pytest
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from firebird.qa import *
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import re
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from pathlib import Path
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import time
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import datetime as py_dt
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import locale
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import pytest
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from firebird.qa import *
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from firebird.driver import tpb, Isolation, TraAccessMode, DatabaseError
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db = db_factory()
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act = python_act('db', substitutions=[('=', ''), ('[ \t]+', ' ')])
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act = python_act( 'db', substitutions = [ ('=', ''), ('[ \t]+', ' '), ('.* EXECUTE_STATEMENT_RESTART', 'EXECUTE_STATEMENT_RESTART') ] )
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#act = python_act( 'db', substitutions = [ ('.* EXECUTE_STATEMENT_RESTART', 'EXECUTE_STATEMENT_RESTART') ] )
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MAX_WAIT_FOR_WORKER_START_MS = 10000;
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SQL_TAG_THAT_WE_WAITING_FOR = 'SQL_TAG_THAT_WE_WAITING_FOR'
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@ -152,72 +176,55 @@ fn_worker_sql = temp_file('tmp_worker.sql')
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fn_worker_log = temp_file('tmp_worker.log')
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fn_worker_err = temp_file('tmp_worker.err')
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expected_stdout = """
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checked_mode: table, STDLOG: Records affected: 6
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#-----------------------------------------------------------------------------------------------------------------------------------------------------
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checked_mode: table, STDLOG: ID
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checked_mode: table, STDLOG: =======
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checked_mode: table, STDLOG: 1
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checked_mode: table, STDLOG: 2
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checked_mode: table, STDLOG: Records affected: 2
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def wait_for_record_become_locked(tx_monitoring, cur_monitoring, sql_to_lock_record, SQL_TAG_THAT_WE_WAITING_FOR):
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checked_mode: table, STDLOG: OLD_ID OP SNAP_NO_RANK
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checked_mode: table, STDLOG: ======= ====== =====================
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checked_mode: table, STDLOG: 3 DEL 1
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checked_mode: table, STDLOG: 4 DEL 1
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checked_mode: table, STDLOG: -3 DEL 2
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checked_mode: table, STDLOG: -2 DEL 2
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checked_mode: table, STDLOG: -1 DEL 2
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checked_mode: table, STDLOG: 3 DEL 2
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checked_mode: table, STDLOG: 4 DEL 2
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checked_mode: table, STDLOG: 5 DEL 2
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checked_mode: table, STDLOG: Records affected: 8
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# ::: NB :::
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# tx_monitoring must work in NOWAIT mode!
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checked_mode: view, STDLOG: Records affected: 6
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checked_mode: view, STDLOG: ID
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checked_mode: view, STDLOG: =======
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checked_mode: view, STDLOG: 1
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checked_mode: view, STDLOG: 2
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checked_mode: view, STDLOG: Records affected: 2
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checked_mode: view, STDLOG: OLD_ID OP SNAP_NO_RANK
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checked_mode: view, STDLOG: ======= ====== =====================
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checked_mode: view, STDLOG: 3 DEL 1
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checked_mode: view, STDLOG: 4 DEL 1
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checked_mode: view, STDLOG: -3 DEL 2
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checked_mode: view, STDLOG: -2 DEL 2
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checked_mode: view, STDLOG: -1 DEL 2
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checked_mode: view, STDLOG: 3 DEL 2
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checked_mode: view, STDLOG: 4 DEL 2
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checked_mode: view, STDLOG: 5 DEL 2
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checked_mode: view, STDLOG: Records affected: 8
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"""
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def wait_for_attach_showup_in_monitoring(con_monitoring, sql_text_tag):
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chk_sql = f"select 1 from mon$statements s where s.mon$attachment_id != current_connection and s.mon$sql_text containing '{sql_text_tag}'"
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attach_with_sql_tag = None
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t1=py_dt.datetime.now()
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cur_monitoring = con_monitoring.cursor()
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required_concurrent_found = None
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concurrent_tx_pattern = re.compile('concurrent transaction number is \\d+', re.IGNORECASE)
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while True:
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cur_monitoring.execute(chk_sql)
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for r in cur_monitoring:
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attach_with_sql_tag = r[0]
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if not attach_with_sql_tag:
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concurrent_tx_number = None
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concurrent_runsql = ''
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tx_monitoring.begin()
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try:
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cur_monitoring.execute(sql_to_lock_record)
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except DatabaseError as exc:
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# Failed: SQL execution failed with: deadlock
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# -update conflicts with concurrent update
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# -concurrent transaction number is 40
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m = concurrent_tx_pattern.search( str(exc) )
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if m:
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concurrent_tx_number = m.group().split()[-1] # 'concurrent transaction number is 40' ==> '40'
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cur_monitoring.execute( 'select mon$sql_text from mon$statements where mon$transaction_id = ?', (int(concurrent_tx_number),) )
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for r in cur_monitoring:
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concurrent_runsql = r[0]
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if SQL_TAG_THAT_WE_WAITING_FOR in concurrent_runsql:
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required_concurrent_found = 1
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# pytest.fail(f"Can not upd, concurrent TX = {concurrent_tx_number}, sql: {concurrent_runsql}")
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finally:
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tx_monitoring.rollback()
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if not required_concurrent_found:
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t2=py_dt.datetime.now()
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d1=t2-t1
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if d1.seconds*1000 + d1.microseconds//1000 >= MAX_WAIT_FOR_WORKER_START_MS:
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break
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else:
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con_monitoring.commit()
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time.sleep(0.2)
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else:
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break
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assert attach_with_sql_tag, f"Could not find attach statement containing '{sql_text_tag}' for {MAX_WAIT_FOR_WORKER_START_MS} ms. ABEND."
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assert required_concurrent_found, f"Could not find attach that running SQL with tag '{SQL_TAG_THAT_WE_WAITING_FOR}' and locks record for {MAX_WAIT_FOR_WORKER_START_MS} ms. Check query: {sql_to_lock_record}. ABEND."
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return
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@pytest.mark.version('>=4.0')
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#-----------------------------------------------------------------------------------------------------------------------------------------------------
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@pytest.mark.version('>=4.0.2')
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def test_1(act: Action, fn_worker_sql: Path, fn_worker_log: Path, fn_worker_err: Path, capsys):
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sql_init = (act.files_dir / 'read-consist-sttm-restart-DDL.sql').read_text()
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@ -246,123 +253,229 @@ def test_1(act: Action, fn_worker_sql: Path, fn_worker_log: Path, fn_worker_err:
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assert act.stderr == ''
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act.reset()
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with act.db.connect() as con_lock_1, act.db.connect() as con_lock_2, act.db.connect() as con_monitoring:
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for i,c in enumerate((con_lock_1,con_lock_2)):
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sttm = f"execute block as begin rdb$set_context('USER_SESSION', 'WHO', 'LOCKER #{i+1}'); end"
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c.execute_immediate(sttm)
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trace_cfg_items = [
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'time_threshold = 0',
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'log_errors = true',
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'log_statement_start = true',
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'log_statement_finish = true',
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]
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#########################
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### L O C K E R - 1 ###
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#########################
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with act.trace(db_events = trace_cfg_items, encoding=locale.getpreferredencoding()):
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con_lock_1.execute_immediate( f'update {target_obj} set id=id where id = 5' % locals() )
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with act.db.connect() as con_lock_1, act.db.connect() as con_lock_2, act.db.connect() as con_monitoring:
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worker_sql = f'''
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set list on;
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set autoddl off;
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set term ^;
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execute block returns (whoami varchar(30)) as
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begin
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whoami = 'WORKER'; -- , ATT#' || current_connection;
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rdb$set_context('USER_SESSION','WHO', whoami);
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-- suspend;
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end
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^
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set term ;^
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commit;
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--set echo on;
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SET KEEP_TRAN_PARAMS ON;
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set transaction read committed read consistency;
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--select current_connection, current_transaction from rdb$database;
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set list off;
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set wng off;
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--set plan on;
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set count on;
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tpb_monitoring = tpb(isolation=Isolation.READ_COMMITTED_RECORD_VERSION, lock_timeout=0)
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tx_monitoring = con_monitoring.transaction_manager(tpb_monitoring)
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cur_monitoring = tx_monitoring.cursor()
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-- delete from {target_obj} where id < 0 or id >= 3 order by id; -- THIS MUST BE LOCKED
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{SQL_TO_BE_RESTARTED};
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-- check results:
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-- ###############
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select id from {target_obj} order by id; -- this will produce output only after all lockers do their commit/rollback
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select v.old_id, v.op, v.snap_no_rank
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from v_worker_log v
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where v.op = 'del';
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set width who 10;
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-- DO NOT check this! Values can differ here from one run to another!
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-- select id, trn, who, old_id, new_id, op, rec_vers, global_cn, snap_no from tlog_done order by id;
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rollback;
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'''
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fn_worker_sql.write_text(worker_sql)
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with fn_worker_log.open(mode='w') as hang_out, fn_worker_err.open(mode='w') as hang_err:
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############################################################################
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### L A U N C H W O R K E R U S I N G I S Q L, A S Y N C. ###
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############################################################################
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p_worker = subprocess.Popen([act.vars['isql'], '-i', str(fn_worker_sql),
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'-user', act.db.user,
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'-password', act.db.password,
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act.db.dsn
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],
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stdout = hang_out,
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stderr = hang_err
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)
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wait_for_attach_showup_in_monitoring(con_monitoring, SQL_TAG_THAT_WE_WAITING_FOR)
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# >>> !!!THIS WAS WRONG!!! >>> time.sleep(1)
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#########################
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### L O C K E R - 2 ###
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#########################
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# Insert ID value that is less than previous min(id).
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# Session-worker is executing its statement using PLAN ORDER,
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# and it should see this new value and restart its statement:
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con_lock_2.execute_immediate( f'insert into {target_obj}(id) values(-1)' % locals() )
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con_lock_2.commit()
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con_lock_2.execute_immediate( f'update {target_obj} set id=id where id = -1' % locals() )
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for i,c in enumerate((con_lock_1,con_lock_2)):
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sttm = f"execute block as begin rdb$set_context('USER_SESSION', 'WHO', 'LOCKER #{i+1}'); end"
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c.execute_immediate(sttm)
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#########################
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### L O C K E R - 1 ###
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#########################
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con_lock_1.commit()
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con_lock_1.execute_immediate( f'insert into {target_obj}(id) values(-2)' % locals() )
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con_lock_1.commit()
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con_lock_1.execute_immediate( f'update {target_obj} set id=id where id = -2' % locals() )
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con_lock_1.execute_immediate( f'update {target_obj} set id=id where id = 5' )
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worker_sql = f'''
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set list on;
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set autoddl off;
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set term ^;
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execute block returns (whoami varchar(30)) as
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begin
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whoami = 'WORKER'; -- , ATT#' || current_connection;
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rdb$set_context('USER_SESSION','WHO', whoami);
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-- suspend;
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end
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^
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set term ;^
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commit;
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--set echo on;
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SET KEEP_TRAN_PARAMS ON;
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set transaction read committed read consistency;
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--select current_connection, current_transaction from rdb$database;
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set list off;
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set wng off;
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--set plan on;
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set count on;
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-- delete from {target_obj} where id < 0 or id >= 3 order by id; -- THIS MUST BE LOCKED
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{SQL_TO_BE_RESTARTED};
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-- check results:
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-- ###############
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select id from {target_obj} order by id; -- this will produce output only after all lockers do their commit/rollback
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select v.old_id, v.op, v.snap_no_rank
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from v_worker_log v
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where v.op = 'del';
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set width who 10;
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-- DO NOT check this! Values can differ here from one run to another!
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-- select id, trn, who, old_id, new_id, op, rec_vers, global_cn, snap_no from tlog_done order by id;
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rollback;
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'''
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fn_worker_sql.write_text(worker_sql)
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with fn_worker_log.open(mode='w') as hang_out, fn_worker_err.open(mode='w') as hang_err:
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############################################################################
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### L A U N C H W O R K E R U S I N G I S Q L, A S Y N C. ###
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############################################################################
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p_worker = subprocess.Popen([act.vars['isql'], '-i', str(fn_worker_sql),
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'-user', act.db.user,
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'-password', act.db.password,
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act.db.dsn
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],
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stdout = hang_out,
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stderr = hang_err
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)
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# NB: when ISQL will establish attach, first record that it must lock is ID = 3 -- see above SQL_TO_BE_RESTARTED
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# We must to ensure that this (worker) attachment has been really created and LOCKS this record:
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#
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wait_for_record_become_locked(tx_monitoring, cur_monitoring, f'update {target_obj} set id=id where id=3', SQL_TAG_THAT_WE_WAITING_FOR)
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#########################
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### L O C K E R - 2 ###
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#########################
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# Insert ID value that is less than previous min(id).
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# Session-worker is executing its statement using PLAN ORDER,
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# and it should see this new value and restart its statement:
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con_lock_2.commit()
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con_lock_2.execute_immediate( f'insert into {target_obj}(id) values(-3)' % locals() )
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con_lock_2.commit()
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con_lock_2.execute_immediate( f'update {target_obj} set id=id where id = -3' % locals() )
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#########################
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### L O C K E R - 2 ###
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#########################
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# Insert ID value that is less than previous min(id).
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# Session-worker is executing its statement using PLAN ORDER,
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# and it should see this new value and restart its statement:
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con_lock_2.execute_immediate( f'insert into {target_obj}(id) values(-1)' )
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con_lock_2.commit()
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con_lock_2.execute_immediate( f'update {target_obj} set id=id where id = -1' )
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con_lock_1.commit()
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con_lock_2.commit()
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#########################
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### L O C K E R - 1 ###
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#########################
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con_lock_1.commit() # releases record with ID = 5 ==> now it can be locked by worker.
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# Here we wait for ISQL complete its mission:
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p_worker.wait()
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# We have to WAIT HERE until worker will actually 'catch' just released record with ID = 5.
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#
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wait_for_record_become_locked(tx_monitoring, cur_monitoring, f'update {target_obj} set id=id where id=5', SQL_TAG_THAT_WE_WAITING_FOR)
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# If we come here then it means that record with ID = 5 for sure is locked by WORKER.
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con_lock_1.execute_immediate( f'insert into {target_obj}(id) values(-2)' )
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con_lock_1.commit()
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con_lock_1.execute_immediate( f'update {target_obj} set id=id where id = -2' )
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||||
|
||||
|
||||
for g in (fn_worker_log, fn_worker_err):
|
||||
with g.open() as f:
|
||||
for line in f:
|
||||
if line.split():
|
||||
if g == fn_worker_log:
|
||||
print(f'checked_mode: {checked_mode}, STDLOG: {line}')
|
||||
else:
|
||||
print(f'UNEXPECTED STDERR {line}')
|
||||
#########################
|
||||
### L O C K E R - 2 ###
|
||||
#########################
|
||||
# Insert ID value that is less than previous min(id).
|
||||
# Session-worker is executing its statement using PLAN ORDER,
|
||||
# and it should see this new value and restart its statement:
|
||||
con_lock_2.commit()
|
||||
|
||||
act.expected_stdout = expected_stdout
|
||||
act.stdout = capsys.readouterr().out
|
||||
assert act.clean_stdout == act.clean_expected_stdout
|
||||
# We have to WAIT HERE until worker will actually 'catch' just released record with ID = -1.
|
||||
#
|
||||
wait_for_record_become_locked(tx_monitoring, cur_monitoring, f'update {target_obj} set id=id where id=-1', SQL_TAG_THAT_WE_WAITING_FOR)
|
||||
# If we come here then it means that record with ID = -1 for sure is locked by WORKER.
|
||||
|
||||
con_lock_2.execute_immediate( f'insert into {target_obj}(id) values(-3)' )
|
||||
con_lock_2.commit()
|
||||
con_lock_2.execute_immediate( f'update {target_obj} set id=id where id = -3' )
|
||||
|
||||
#########################
|
||||
### L O C K E R - 1 ###
|
||||
#########################
|
||||
con_lock_1.commit()
|
||||
|
||||
# We have to WAIT HERE until worker will actually 'catch' just released record with ID = -2.
|
||||
#
|
||||
wait_for_record_become_locked(tx_monitoring, cur_monitoring, f'update {target_obj} set id=id where id=-2', SQL_TAG_THAT_WE_WAITING_FOR)
|
||||
# If we come here then it means that record with ID = -2 for sure is locked by WORKER.
|
||||
|
||||
|
||||
con_lock_2.commit() # WORKER will complete his job after this
|
||||
|
||||
# Here we wait for ISQL complete its mission:
|
||||
p_worker.wait()
|
||||
|
||||
#< with act.db.connect()
|
||||
|
||||
|
||||
for g in (fn_worker_log, fn_worker_err):
|
||||
with g.open() as f:
|
||||
for line in f:
|
||||
if line.split():
|
||||
if g == fn_worker_log:
|
||||
print(f'checked_mode: {checked_mode}, STDLOG: {line}')
|
||||
else:
|
||||
print(f'UNEXPECTED STDERR {line}')
|
||||
|
||||
expected_stdout_worker = f"""
|
||||
checked_mode: {checked_mode}, STDLOG: Records affected: 6
|
||||
|
||||
checked_mode: {checked_mode}, STDLOG: ID
|
||||
checked_mode: {checked_mode}, STDLOG: =======
|
||||
checked_mode: {checked_mode}, STDLOG: 1
|
||||
checked_mode: {checked_mode}, STDLOG: 2
|
||||
checked_mode: {checked_mode}, STDLOG: Records affected: 2
|
||||
|
||||
checked_mode: {checked_mode}, STDLOG: OLD_ID OP SNAP_NO_RANK
|
||||
checked_mode: {checked_mode}, STDLOG: ======= ====== =====================
|
||||
checked_mode: {checked_mode}, STDLOG: 3 DEL 1
|
||||
checked_mode: {checked_mode}, STDLOG: 4 DEL 1
|
||||
checked_mode: {checked_mode}, STDLOG: -3 DEL 2
|
||||
checked_mode: {checked_mode}, STDLOG: -2 DEL 2
|
||||
checked_mode: {checked_mode}, STDLOG: -1 DEL 2
|
||||
checked_mode: {checked_mode}, STDLOG: 3 DEL 2
|
||||
checked_mode: {checked_mode}, STDLOG: 4 DEL 2
|
||||
checked_mode: {checked_mode}, STDLOG: 5 DEL 2
|
||||
checked_mode: {checked_mode}, STDLOG: Records affected: 8
|
||||
"""
|
||||
|
||||
act.expected_stdout = expected_stdout_worker
|
||||
act.stdout = capsys.readouterr().out
|
||||
assert act.clean_stdout == act.clean_expected_stdout
|
||||
act.reset()
|
||||
|
||||
# < with act.trace
|
||||
|
||||
allowed_patterns = \
|
||||
[
|
||||
'\\)\\s+EXECUTE_STATEMENT_RESTART$'
|
||||
,re.escape(SQL_TO_BE_RESTARTED)
|
||||
,'^Restarted \\d+ time\\(s\\)'
|
||||
]
|
||||
allowed_patterns = [re.compile(x) for x in allowed_patterns]
|
||||
|
||||
for line in act.trace_log:
|
||||
if line.strip():
|
||||
if act.match_any(line.strip(), allowed_patterns):
|
||||
print(line.strip())
|
||||
|
||||
expected_stdout_trace = f"""
|
||||
{SQL_TO_BE_RESTARTED}
|
||||
|
||||
EXECUTE_STATEMENT_RESTART
|
||||
{SQL_TO_BE_RESTARTED}
|
||||
Restarted 1 time(s)
|
||||
|
||||
EXECUTE_STATEMENT_RESTART
|
||||
{SQL_TO_BE_RESTARTED}
|
||||
Restarted 2 time(s)
|
||||
|
||||
EXECUTE_STATEMENT_RESTART
|
||||
{SQL_TO_BE_RESTARTED}
|
||||
Restarted 3 time(s)
|
||||
|
||||
EXECUTE_STATEMENT_RESTART
|
||||
{SQL_TO_BE_RESTARTED}
|
||||
Restarted 4 time(s)
|
||||
|
||||
{SQL_TO_BE_RESTARTED}
|
||||
"""
|
||||
|
||||
act.expected_stdout = expected_stdout_trace
|
||||
act.stdout = capsys.readouterr().out
|
||||
assert act.clean_stdout == act.clean_expected_stdout
|
||||
act.reset()
|
||||
|
||||
# < for checked_mode in('table', 'view')
|
||||
|
||||
Loading…
Reference in New Issue
Block a user