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Posted to issues@ozone.apache.org by "runzhiwang (Jira)" <ji...@apache.org> on 2020/03/22 02:41:00 UTC
[jira] [Comment Edited] (HDDS-3244) Improve write efficiency by
optimizing RocksDB.open
[ https://issues.apache.org/jira/browse/HDDS-3244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17064149#comment-17064149 ]
runzhiwang edited comment on HDDS-3244 at 3/22/20, 2:40 AM:
------------------------------------------------------------
[~bharat] Hi, when create each container in datanode, it will create an instance of [RocksDB|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]. I'm confused, if the RocksDB was unnecessary, why create it. Because when create RocksDB, [RocksDB.open|https://github.com/apache/hadoop-ozone/blob/master/hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/utils/RocksDBStore.java#L68] will cost 150ms-200ms, it cost too long.
was (Author: yjxxtd):
[~bharat] Hi, when create each container in datanode, it will create an instance of [RocksDB|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]. I'm confused, if the RocksDB was unnecessary, why create it. Because when create RocksDB, RocksDB.open will cost 150ms-200ms, it cost too long.
> Improve write efficiency by optimizing RocksDB.open
> ---------------------------------------------------
>
> 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
>
> [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 when create container, it's a waste.
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