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https://issues.apache.org/jira/browse/HDDS-2309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17650542#comment-17650542
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mingchao zhao commented on HDDS-2309:
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Ozone 1.3.0 had been released and we currently have more than 600 open issues
targeted for 1.3.0. I am moving the target field to 1.4.0.
If there is anything needs to be discussed about the Target Version, Please
reach out to me via Apache email or Slack.
> Optimise OzoneManagerDoubleBuffer::flushTransactions to flush in batches
> ------------------------------------------------------------------------
>
> Key: HDDS-2309
> URL: https://issues.apache.org/jira/browse/HDDS-2309
> Project: Apache Ozone
> Issue Type: Bug
> Components: Ozone Manager
> Reporter: Rajesh Balamohan
> Priority: Major
> Labels: TriagePending, performance
> Attachments: Screenshot 2019-10-15 at 4.19.13 PM.png
>
>
> When running a write heavy benchmark,
> {{{color:#000000}org/apache/hadoop/ozone/om/ratis/OzoneManagerDoubleBuffer.flushTransactions{color}}}
> was invoked for pretty much every write.
> This forces {{cleanupCache}} to be invoked which ends up choking in single
> thread executor. Attaching the profiler information which gives more details.
> Ideally, {{flushTransactions}} should batch up the work to reduce load on
> rocksDB.
>
> [https://github.com/apache/hadoop-ozone/blob/master/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/ratis/OzoneManagerDoubleBuffer.java#L130]
>
> [https://github.com/apache/hadoop-ozone/blob/master/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/ratis/OzoneManagerDoubleBuffer.java#L322]
>
>
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