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https://issues.apache.org/jira/browse/HDDS-3244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shashikant Banerjee resolved HDDS-3244.
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Fix Version/s: 0.6.0
Resolution: Fixed
Thanks [~yjxxtd] for working on this. I have committed this.
> Improve write efficiency by opening RocksDB only once
> -----------------------------------------------------
>
> Key: HDDS-3244
> URL: https://issues.apache.org/jira/browse/HDDS-3244
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: runzhiwang
> Assignee: runzhiwang
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.6.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> when datanode create each container, a new RocksDB instance will be
> [created|https://github.com/apache/hadoop-ozone/blob/master/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/helpers/KeyValueContainerUtil.java#L76],
> but then the created RocksDB was
> [closed|https://github.com/apache/hadoop-ozone/blob/master/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/helpers/KeyValueContainerUtil.java#L83],
> until PutBlock the RocsDB will be
> [opend|https://github.com/apache/hadoop-ozone/blob/master/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/utils/ContainerCache.java#L123]
> again, so the RocksDB was open twice.
> [RocksDB.open|https://github.com/apache/hadoop-ozone/blob/master/hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/utils/RocksDBStore.java#L68]
> cost about 150ms-200ms, it's a waste to open it twice.
> I will try to open the RocksDB only once.
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