[jira] [Assigned] (HDDS-2309) Optimise OzoneManagerDoubleBuffer::flushTransactions to flush in batches

["Bharat Viswanadham (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-2309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bharat Viswanadham reassigned HDDS-2309:
----------------------------------------

    Assignee:     (was: Bharat Viswanadham)

> 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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