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Code Issues

Make automatic online re-initialization reliable (#8324)

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This commit is contained in:
Dmitry Yemanov 2024-11-25 09:01:00 +03:00
parent 2cc772c8f8
commit a8c5b9fa96
1 changed files with 59 additions and 24 deletions
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83
src/remote/server/ReplServer.cpp
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@ -574,17 +574,20 @@ namespace
return true;
}
enum ActionType { REPLICATE, REPLAY, FAST_FORWARD };
void replicate(Target* target,
TransactionList& transactions,
FB_UINT64 sequence, ULONG offset,
ULONG length, const UCHAR* data,
bool rewind)
ActionType action)
{
const Block* const header = (Block*) data;
const auto traNumber = header->traNumber;
if (!rewind || !traNumber || transactions.exist(traNumber))
if (action == REPLICATE ||
(action == REPLAY && (!traNumber || transactions.exist(traNumber))))
{
target->replicate(sequence, offset, length, data);
}
@ -597,7 +600,7 @@ namespace
if (transactions.find(traNumber, pos))
transactions.remove(pos);
}
else if (!rewind)
else if (action != REPLAY)
{
transactions.clear();
}
@ -606,7 +609,7 @@ namespace
{
fb_assert(traNumber);
if (!rewind && !transactions.exist(traNumber))
if (action != REPLAY && !transactions.exist(traNumber))
transactions.add(ActiveTransaction(traNumber, sequence));
}
}
@ -737,6 +740,7 @@ namespace
const FB_UINT64 max_sequence = queue.back()->header.hdr_sequence;
FB_UINT64 next_sequence = 0;
const bool restart = target->isShutdown();
auto action = REPLICATE;
for (auto segment : queue)
{
@ -754,21 +758,48 @@ namespace
const FB_UINT64 db_sequence = target->initReplica();
const FB_UINT64 last_db_sequence = control.getDbSequence();
if (sequence <= db_sequence)
{
target->verbose("Deleting segment %" UQUADFORMAT " due to fast forward", sequence);
segment->remove();
continue;
}
if (db_sequence != last_db_sequence)
{
target->verbose("Resetting replication to continue from segment %" UQUADFORMAT, db_sequence + 1);
control.saveDbSequence(db_sequence);
transactions.clear();
control.saveComplete(db_sequence, transactions);
last_sequence = db_sequence;
last_offset = 0;
if (sequence == db_sequence + 1)
{
if (const auto oldest = findOldest(transactions))
{
const TraNumber oldest_trans = oldest->tra_id;
const FB_UINT64 oldest_sequence = oldest ? oldest->sequence : 0;
target->verbose("Resetting replication to continue from segment %" UQUADFORMAT
" (new OAT: %" UQUADFORMAT " in segment %" UQUADFORMAT ")",
db_sequence + 1, oldest_trans, oldest_sequence);
}
else
{
target->verbose("Resetting replication to continue from segment %" UQUADFORMAT,
db_sequence + 1);
}
control.saveDbSequence(db_sequence);
return PROCESS_SHUTDOWN; // this enforces restart from OAT
}
if (action != FAST_FORWARD)
{
if (segment != queue.front())
{
fb_assert(false);
return PROCESS_SHUTDOWN;
}
if (db_sequence > max_sequence)
{
target->verbose("Database sequence has been changed to %" UQUADFORMAT
", waiting for appropriate segment", db_sequence);
return PROCESS_SUSPEND;
}
target->verbose("Database sequence has been changed to %" UQUADFORMAT
", preparing for replication reset", db_sequence);
action = FAST_FORWARD;
}
}
// If no new segments appeared since our last attempt,
@ -843,8 +874,10 @@ namespace
if (blockLength)
{
const bool rewind = (sequence < last_sequence ||
const bool replay = (sequence < last_sequence ||
(sequence == last_sequence && (!last_offset || totalLength < last_offset)));
if (action != FAST_FORWARD)
action = replay ? REPLAY : REPLICATE;
UCHAR* const data = buffer.getBuffer(length);
memcpy(data, &header, sizeof(Block));
@ -852,8 +885,7 @@ namespace
if (read(file, data + sizeof(Block), blockLength) != blockLength)
raiseError("Journal file %s read failed (error %d)", segment->filename.c_str(), ERRNO);
replicate(target, transactions, sequence, totalLength,
length, data, rewind);
replicate(target, transactions, sequence, totalLength, length, data, action);
}
totalLength += length;
@ -872,7 +904,10 @@ namespace
oldest_sequence = oldest ? oldest->sequence : 0;
next_sequence = sequence + 1;
string extra;
string actionName, extra;
actionName = (action == FAST_FORWARD) ? "scanned" :
(action == REPLAY) ? "replayed" : "replicated";
if (oldest)
{
const TraNumber oldest_trans = oldest->tra_id;
@ -884,8 +919,8 @@ namespace
extra = "deleting";
}
target->verbose("Segment %" UQUADFORMAT " (%u bytes) is replicated in %s, %s",
sequence, totalLength, interval.c_str(), extra.c_str());
target->verbose("Segment %" UQUADFORMAT " (%u bytes) is %s in %s, %s",
sequence, totalLength, actionName.c_str(), interval.c_str(), extra.c_str());
if (!oldest_sequence)
segment->remove();
@ -907,8 +942,8 @@ namespace
break;
target->verbose("Deleting segment %" UQUADFORMAT " as no longer needed", sequence);
segment->remove();
} while (pos < queue.getCount());
}
}