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From "Hadoop QA (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14858) [SBN read] Allow configurably enable/disable AlignmentContext on NameNode
Date Thu, 19 Sep 2019 23:01:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16933838#comment-16933838
] 

Hadoop QA commented on HDFS-14858:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  8s{color} | {color:red}
HDFS-14858 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-14858 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12980792/HDFS-14858.001.patch
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| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/27913/console |
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This message was automatically generated.



> [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
>
>
> 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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