Rajesh Balamohan created HDDS-2309:
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Summary: Optimise OzoneManagerDoubleBuffer::flushTransactions to
flush in batches
Key: HDDS-2309
URL: https://issues.apache.org/jira/browse/HDDS-2309
Project: Hadoop Distributed Data Store
Issue Type: Bug
Components: Ozone Manager
Reporter: Rajesh Balamohan
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]
(implementation of canFlush() has to be optimized for correct batching).
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