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From "Ted Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4528) The put operation can release the rowlock before sync-ing the Hlog
Date Sun, 23 Oct 2011 10:46:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13133610#comment-13133610
] 

Ted Yu commented on HBASE-4528:
-------------------------------

>From StoreFile.Reader.passesTimerangeFilter():
{code}
    public boolean shouldSeek(Scan scan, final SortedSet<byte[]> columns) {
      return (passesTimerangeFilter(scan) && passesBloomFilter(scan, columns));
    }

    /**
     * Check if this storeFile may contain keys within the TimeRange
     * @param scan
     * @return False if it definitely does not exist in this StoreFile
     */
    private boolean passesTimerangeFilter(Scan scan) {
{code}

                
> The put operation can release the rowlock before sync-ing the Hlog
> ------------------------------------------------------------------
>
>                 Key: HBASE-4528
>                 URL: https://issues.apache.org/jira/browse/HBASE-4528
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.94.0
>
>         Attachments: appendNoSync5.txt, appendNoSyncPut1.txt, appendNoSyncPut2.txt, appendNoSyncPut3.txt,
appendNoSyncPut4.txt, appendNoSyncPut5.txt, appendNoSyncPut6.txt, appendNoSyncPut7.txt, appendNoSyncPut8.txt
>
>
> This allows for better throughput when there are hot rows. A single row update improves
from 100 puts/sec/server to 5000 puts/sec/server.

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