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https://issues.apache.org/jira/browse/HDFS-12853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16316006#comment-16316006
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Tsz Wo Nicholas Sze commented on HDFS-12853:
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> COMMIT_DATA should be sync'ed with WRITE_DATA so that COMMIT_DATA is always
> after WRITE_DATA.
If we don't have the synchronization mentioned the above, it seems that the
patch won't work?
> Ozone: Optimize chunk writes for Ratis by avoiding double writes
> ----------------------------------------------------------------
>
> Key: HDFS-12853
> URL: https://issues.apache.org/jira/browse/HDFS-12853
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Mukul Kumar Singh
> Assignee: Mukul Kumar Singh
> Fix For: HDFS-7240
>
> Attachments: HDFS-12853-HDFS-7240.001.patch,
> HDFS-12853-HDFS-7240.002.patch
>
>
> Ozone, in replicated mode writes the data twice, once to the raft log and
> then to the statemachine.
> This results in the data being written twice during a particular chunk write,
> this is subobtimal. With RATIS-122 the statemachine in Ozone can be optimized
> by writing the data to the statemachine only once.
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