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Posted to issues@ozone.apache.org by "Shashikant Banerjee (Jira)" <ji...@apache.org> on 2020/04/09 15:49:00 UTC
[jira] [Resolved] (HDDS-3244) Improve write efficiency by opening
RocksDB only once
[ https://issues.apache.org/jira/browse/HDDS-3244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shashikant Banerjee resolved HDDS-3244.
---------------------------------------
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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