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https://issues.apache.org/jira/browse/HDDS-3283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17124281#comment-17124281
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Arpit Agarwal commented on HDDS-3283:
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Is this jira covering both DN and OM?
> Improve write efficiency by decreasing the number of force sync to disk
> -----------------------------------------------------------------------
>
> Key: HDDS-3283
> URL: https://issues.apache.org/jira/browse/HDDS-3283
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: runzhiwang
> Assignee: runzhiwang
> Priority: Major
>
> The whole write cost about 140ms, and 110ms was cost by force sync to disk.
> The force sync operations are as follows.
> *RocksDB*
> 1. When create key, the response was put into
> [omDoubleBufferHelper|https://github.com/apache/hadoop-ozone/blob/master/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/request/key/OMKeyCreateRequest.java#L264],
> and sync to disk by
> [writeOptions.setSync(true)|https://github.com/apache/hadoop-ozone/blob/master/hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/utils/db/DBStoreBuilder.java#L171]
> 2. When commit key, the response was put into
> [omDoubleBufferHelper|https://github.com/apache/hadoop-ozone/blob/master/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/request/key/OMKeyCommitRequest.java#L222],
> and sync to disk by
> [writeOptions.setSync(true)|https://github.com/apache/hadoop-ozone/blob/master/hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/utils/db/DBStoreBuilder.java#L171]
> *Ratis*
> 1. leader and follower [sync
> |https://github.com/apache/incubator-ratis/blob/master/ratis-server/src/main/java/org/apache/ratis/server/raftlog/segmented/BufferedWriteChannel.java#L86]
> raftlog to disk
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