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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19024) provide a configurable option to hsync WAL edits to the disk for better durability
Date Fri, 27 Oct 2017 22:55:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16223001#comment-16223001
] 

Andrew Purtell commented on HBASE-19024:
----------------------------------------

Changes lgtm.

Let me check these failures locally
{noformat}
Failed junit tests 	hadoop.hbase.regionserver.TestHRegionWithInMemoryFlush
  	hadoop.hbase.regionserver.TestHRegion 
{noformat}

I will also try to bring the changes back to branch-1. If all good will commit. 

> provide a configurable option to hsync WAL edits to the disk for better durability
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-19024
>                 URL: https://issues.apache.org/jira/browse/HBASE-19024
>             Project: HBase
>          Issue Type: Improvement
>          Components: wal
>         Environment: 
>            Reporter: Vikas Vishwakarma
>            Assignee: Harshal Jain
>         Attachments: master.patch, master.v2.patch
>
>
> At present we do not have an option to hsync WAL edits to the disk for better durability.
In our local tests we see 10-15% latency impact of using hsync instead of hflush which is
not very high.  
> We should have a configurable option to hysnc WAL edits instead of just sync/hflush which
will call the corresponding API on the hadoop side. Currently HBase handles both SYNC_WAL
and FSYNC_WAL as the same calling FSDataOutputStream sync/hflush on the hadoop side. This
can be modified to let FSYNC_WAL call hsync on the hadoop side instead of sync/hflush. We
can keep the default value to sync as the current behavior and hsync can be enabled based
on explicit configuration.



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