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From "John Leach (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12912) StoreScanner calls Configuration for Boolean Check on each initialization
Date Fri, 23 Jan 2015 21:46:34 GMT
John Leach created HBASE-12912:
----------------------------------

             Summary: StoreScanner calls Configuration for Boolean Check on each initialization
                 Key: HBASE-12912
                 URL: https://issues.apache.org/jira/browse/HBASE-12912
             Project: HBase
          Issue Type: Bug
            Reporter: John Leach
         Attachments: StoreScannerStall.tiff

There is a clear CPU drain and iterator creation when creating store scanners under high load.
 Splice was running a TPCC test of our database and we are seeing object creation and CPU
waste on the boolean check....


Code Snippet...

if (store != null && ((HStore)store).getHRegion() != null
        && store.getStorefilesCount() > 1) {
      RegionServerServices rsService = ((HStore)store).getHRegion().getRegionServerServices();
      if (rsService == null || !rsService.getConfiguration().getBoolean(
            STORESCANNER_PARALLEL_SEEK_ENABLE, false)) return;
      isParallelSeekEnabled = true;
      executor = rsService.getExecutorService();
    }

Will attach profile...




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