[jira] [Created] (HBASE-24578) [WAL] Add a parameter to config RingBufferEventHandler's SyncFuture count

["Reid Chan (Jira)" <ji...@apache.org>]

Reid Chan created HBASE-24578:
---------------------------------

             Summary: [WAL] Add a parameter to config RingBufferEventHandler's SyncFuture count
                 Key: HBASE-24578
                 URL: https://issues.apache.org/jira/browse/HBASE-24578
             Project: HBase
          Issue Type: Improvement
            Reporter: Reid Chan


The current value is the value of {{hbase.regionserver.handler.count}}, which works good in default wal provider --- one WAL per regionserver.

When I tried to use WAL group provider, either by group or wal per region, the default value was bad. If rs has 100 regions I use wal per region strategy, then rs will allocate 100 * SyncFuture[$hbase.regionserver.handler.count] array
{code}
int maxHandlersCount = conf.getInt(HConstants.REGION_SERVER_HANDLER_COUNT, 200);
    this.ringBufferEventHandler = new RingBufferEventHandler(
        conf.getInt("hbase.regionserver.hlog.syncer.count", 5), maxHandlersCount); 
...

----

RingBufferEventHandler(final int syncRunnerCount, final int maxHandlersCount) {
      this.syncFutures = new SyncFuture[maxHandlersCount];
      ...
 }
{code} 



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