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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12864) Ozone: Turn off full synced write in RocksDB MetadataStore
Date Tue, 24 Apr 2018 20:59:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16451124#comment-16451124
] 

Hudson commented on HDFS-12864:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #14057 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/14057/])
HDFS-12864. Ozone: Turn off full synced write in RocksDB MetadataStore. (aengineer: rev ffccb190074782ef5d2b896063639c4de62aca84)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/utils/RocksDBStore.java


> Ozone: Turn off full synced write in RocksDB MetadataStore
> ----------------------------------------------------------
>
>                 Key: HDFS-12864
>                 URL: https://issues.apache.org/jira/browse/HDFS-12864
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Elek, Marton
>            Assignee: Elek, Marton
>            Priority: Major
>             Fix For: HDFS-7240
>
>         Attachments: HDFS-12864-HDFS-7240.001.patch
>
>
> Based on the suggestion from [~xyao] I created the patch to turn off fully synced write
in the rocksdb.
> With this patch we measured about 10x performance gain (200 nodes cluster + 30 corona
instance).
> 1. We don't need fully synced rocksdb writing, as HA will cover the few cases when a
node would be lost
> 2. Long term (IMHO) we need to add a possibility to configure any settings in rocksdb,
so it could be turned off, but the setSync(false) is a reasonable default.



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