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Posted to dev@hbase.apache.org by "Himanshu Vashishtha (JIRA)" <ji...@apache.org> on 2014/02/20 18:32:19 UTC
[jira] [Created] (HBASE-10577) Remove unnecessary looping in FSHLog
Himanshu Vashishtha created HBASE-10577:
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Summary: Remove unnecessary looping in FSHLog
Key: HBASE-10577
URL: https://issues.apache.org/jira/browse/HBASE-10577
Project: HBase
Issue Type: Bug
Components: wal
Affects Versions: 0.99.0
Reporter: Himanshu Vashishtha
In the new disruptor based FSHLog, the Syncer threads are handed a batch of SyncFuture objects from the RingBufferHandler. The Syncer then invokes a sync call on the current writer instance.
This handing of batch is done in serially in RingBufferHandler, that is, every syncer receives a non overlapping batch of SyncFutures. Once synced, Syncer thread updates highestSyncedSequence.
In the run method of Syncer, we have:
{code}
long currentHighestSyncedSequence = highestSyncedSequence.get();
if (currentSequence < currentHighestSyncedSequence) {
syncCount += releaseSyncFuture(takeSyncFuture, currentHighestSyncedSequence, null);
// Done with the 'take'. Go around again and do a new 'take'.
continue;
}
{code}
I find this logic of polling the BlockingQueue again in this condition un-necessary. When the currentHighestSyncedSequence is already greater than currentSequence, then doesn't it mean some other Syncer has already synced SyncFuture of these ops ? And, we should just go ahead and release all the SyncFutures for this batch to unblock the handlers. That would avoid polling the Blockingqueue for all SyncFuture objects in this case.
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