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From "Ayush Saxena (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14858) [SBN read] Allow configurably enable/disable AlignmentContext on NameNode
Date Tue, 24 Sep 2019 16:56:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16936986#comment-16936986
] 

Ayush Saxena commented on HDFS-14858:
-------------------------------------

Thanx [~vagarychen] for the patch, it should be by default false only. Give a check if the
config finds a place in {{ObserverNamenode.md}} too.
Apart Looks Good.

> [SBN read] Allow configurably enable/disable AlignmentContext on NameNode
> -------------------------------------------------------------------------
>
>                 Key: HDFS-14858
>                 URL: https://issues.apache.org/jira/browse/HDFS-14858
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>            Priority: Major
>         Attachments: HDFS-14858.001.patch, HDFS-14858.002.patch
>
>
> As brought up under HDFS-14277, we should make sure SBN read has no performance impact
when it is not enabled. One potential overhead of SBN read is maintaining and updating additional
state status on NameNode. Specifically, this is done by creating/updating/checking a {{GlobalStateIdContext}}
instance. Currently, even without enabling SBN read, this logic is still be checked.  We can
make this configurable so that when SBN read is not enabled, there is no such overhead and
everything works as-is.



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