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https://issues.apache.org/jira/browse/HDDS-3240?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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runzhiwang reopened HDDS-3240:
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> Improve write efficiency by creating container in parallel.
> -----------------------------------------------------------
>
> Key: HDDS-3240
> URL: https://issues.apache.org/jira/browse/HDDS-3240
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: runzhiwang
> Assignee: runzhiwang
> Priority: Major
> Attachments: screenshot-1.png
>
>
> 1. As the image shows, when stage is
> DispatcherContext.WriteChunkStage.WRITE_DATA, the leader datanode execute two
> steps: KeyValueHandleHandler.handleCreateContainer,
> keyValueHandler.handleWriteChunk, after leader finish the two steps, the two
> follower datanodes execute two steps:
> KeyValueHandleHandler.handleCreateContainer,
> keyValueHandler.handleWriteChunk.
> 2. The problem is KeyValueHandleHandler.handleCreateContainer cost about
> 300ms, so the leader and two followers cost 600ms to createContainer. The
> total cost of the whole write is about 1000ms, so it's a waste for leader and
> follower createContainer in sequential.
> 3. Besides, when createContainer, RocksDB.open cost about 200ms.
> So I will try to:
> A. leader datanode and 2 follower datanodes create container in parallel, not
> in sequential.
> B. optimize RocksDB.open.
> !screenshot-1.png!
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