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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5456) NameNode startup progress creates new steps if caller attempts to create a counter for a step that doesn't already exist.
Date Tue, 05 Nov 2013 06:12:17 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5456?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HDFS-5456:
--------------------------------

       Resolution: Fixed
    Fix Version/s: 2.2.1
                   3.0.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Thank you for the code review, Arpit.  I've committed this patch to trunk, branch-2, and branch-2.2.

> NameNode startup progress creates new steps if caller attempts to create a counter for
a step that doesn't already exist.
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5456
>                 URL: https://issues.apache.org/jira/browse/HDFS-5456
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>            Priority: Critical
>             Fix For: 3.0.0, 2.2.1
>
>         Attachments: HDFS-5456.1.patch
>
>
> NameNode startup progress is supposed to be immutable after startup has completed.  All
methods are coded to ignore update attempts after startup has completed.  However, {{StartupProgress#getCounter}}
does not implement this correctly.  If a caller attempts to get a counter for a new step that
hasn't been seen before, then the method accidentally creates the step.  This allocates additional
space in the internal tracking data structures, so ultimately this is a memory leak.



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