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https://issues.apache.org/jira/browse/HBASE-20471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16446704#comment-16446704
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Yu Li commented on HBASE-20471:
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bq. The global configs can be configured at Table or CF level also by using
setConfiguration(String key, String value) any way
Yes, but currently the per-table/CF setting for durability (if different from
global) could not be assured due to the same disruptor mechanism...
> Recheck the design and implementation of FSYNC_WAL durability for WAL
> ---------------------------------------------------------------------
>
> Key: HBASE-20471
> URL: https://issues.apache.org/jira/browse/HBASE-20471
> Project: HBase
> Issue Type: Task
> Reporter: Yu Li
> Priority: Major
>
> This is something derived from discussion in HBASE-19024 around [this
> comment|https://issues.apache.org/jira/browse/HBASE-19024?focusedCommentId=16445592&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16445592]
> We have been supplying user the API to set durability per mutation for a long
> time, by design the SYNC_WAL durability to call {{FSDataOutputStream#hflush}}
> and FSYNC_WAL {{FSDataOutputStream#hsync}}, while in implementation we have
> been calling hflush for FSYNC_WAL also until HBASE-19024. Although
> HBASE-19024 tried to fix the syntax with good willing, the implementation
> there cannot assure the FSYNC_WAL edits are truly hsync'ed due to the
> disruptor mechanism used in WAL implementation. Here in this JIRA we aim to
> have more discussion and give it a complete solution.
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