Rajesh Balamohan created HDDS-2382:
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Summary: Consider reducing number of file::exists() calls during
write operation
Key: HDDS-2382
URL: https://issues.apache.org/jira/browse/HDDS-2382
Project: Hadoop Distributed Data Store
Issue Type: Bug
Components: Ozone Datanode
Reporter: Rajesh Balamohan
When writing 100-200 MB files with multiple threads, observed lots of
{{[file::exists(])}} checks.
For every 16 MB chunk, it ends up checking whether {{chunksLoc}} directory
exists or not. (ref:
[https://github.com/apache/hadoop-ozone/blob/master/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/helpers/ChunkUtils.java#L239])
Also, this check ({{ChunkUtils.getChunkFile}}) happens from 2 places.
1.org.apache.hadoop.ozone.container.common.transport.server.ratis.ContainerStateMachine.lambda$handleWriteChunk
2.org.apache.hadoop.ozone.container.common.transport.server.ratis.ContainerStateMachine.lambda$applyTransaction
Note that these are folders and not actual chunk filenames. It would be helpful
to reduce this check, if we track create/delete of these folders.
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