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https://issues.apache.org/jira/browse/HBASE-19024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harshal Jain updated HBASE-19024:
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Attachment: master.v9.patch
> 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: branch-1.branch-1.patch, branch-1.v1.branch-1.patch,
> master.patch, master.v2.patch, master.v3.patch, master.v5.patch,
> master.v5.patch, master.v6.patch, master.v8.patch, master.v8.patch,
> master.v9.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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