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MDEV-18080, part#1: MyRocks is slow with log-bin=off

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The cause for this was fix MDEV-15372, which was trying to speed up
the parallel slave.

Part#1: Do not attempt the "optimization" for transactions that are not
replication slave workers.
This commit is contained in:
Sergei Petrunia 2019-03-28 15:54:42 +03:00
parent e42192d7b3
commit 8fcd9478cc
1 changed files with 25 additions and 13 deletions
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12
storage/rocksdb/ha_rocksdb.cc
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@ -3750,6 +3750,10 @@ static int rocksdb_commit(handlerton* hton, THD* thd, bool commit_tx)
- For a COMMIT statement that finishes a multi-statement transaction
- For a statement that has its own transaction
*/
if (thd->slave_thread)
{
// An attempt to make parallel slave performant (not fully successful,
// see MDEV-15372):
// First, commit without syncing. This establishes the commit order
tx->set_sync(false);
@ -3765,6 +3769,14 @@ static int rocksdb_commit(handlerton* hton, THD* thd, bool commit_tx)
if (!s.ok())
DBUG_RETURN(HA_ERR_INTERNAL_ERROR);
}
}
else
{
/* Not a slave thread */
if (tx->commit()) {
DBUG_RETURN(HA_ERR_ROCKSDB_COMMIT_FAILED);
}
}
} else {
/*
We get here when committing a statement within a transaction.