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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-2957) Release row lock when waiting for wal-sync
Date Wed, 16 Jul 2014 23:03:05 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2957?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell resolved HBASE-2957.
-----------------------------------

    Resolution: Not a Problem

> Release row lock when waiting for wal-sync
> ------------------------------------------
>
>                 Key: HBASE-2957
>                 URL: https://issues.apache.org/jira/browse/HBASE-2957
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver, wal
>    Affects Versions: 0.20.0
>            Reporter: Prakash Khemani
>
> Is there a reason to hold on to the row-lock while waiting for the WAL-sync to be completed
by the logSyncer thread?
> I think data consistency will be guaranteed even if the following happens (a) the row
lock is held while the row is updated in memory (b) the row lock is released after queuing
the KV record for WAL-syncing (c) the log-sync system guarantees that the log records for
any given row are synced in order (d) the HBase client only receives a success notification
after the sync completes (no change from the current state)
> I think this should be a huge win. For my use case, and I am sure for others,  the handler
thread spends the bulk of its row-lock critical section  time waiting for sync to complete.
> Even if the log-sync system cannot guarantee the orderly completion of sync records,
the "Don't hold row lock while waiting for sync" option should be available to HBase clients
on a per request basis.



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