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From "dhruba borthakur (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4528) The put operation can release the rowlock before sync-ing the Hlog
Date Sat, 08 Oct 2011 07:49:30 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HBASE-4528:
------------------------------------

    Attachment: appendNoSyncPut4.txt

Addressed Gary's concern. The HLog.sync() does not throw an exception if it encounters a HDFS
error. Instead it triggers a logroll as usual.

If the put code encounter an error while syncing to hdfs, then it rollbacks the change to
the memstore and throws an exception to the client.

Kannan: I will rerun my performance benchmark and report results.
                
> 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
>         Attachments: appendNoSyncPut1.txt, appendNoSyncPut2.txt, appendNoSyncPut3.txt,
appendNoSyncPut4.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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