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https://issues.apache.org/jira/browse/HDFS-15931?focusedWorklogId=575919&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-575919
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ASF GitHub Bot logged work on HDFS-15931:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 02/Apr/21 05:42
            Start Date: 02/Apr/21 05:42
    Worklog Time Spent: 10m 
      Work Description: liuml07 commented on pull request #2830:
URL: https://github.com/apache/hadoop/pull/2830#issuecomment-812331417


   Right right, the PR title is as this one shows now - without "Contributed 
by...".
   
   ```
   HADOOP-12345. Fix foo.
   ```
   
   When committing, this "Contributed by ..." will be added into subject/ 
title. I also seen people keep this in commit message. 
   
   My comment was more about `:` vs `.`.


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 575919)
    Time Spent: 2.5h  (was: 2h 20m)

> Fix non-static inner classes for better memory management
> ---------------------------------------------------------
>
>                 Key: HDFS-15931
>                 URL: https://issues.apache.org/jira/browse/HDFS-15931
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Viraj Jasani
>            Assignee: Viraj Jasani
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.3.1, 3.4.0, 3.1.5, 2.10.2, 3.2.3
>
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
>
> If an inner class does not need to reference its enclosing instance, it can 
> be static. This prevents a common cause of memory leaks and uses less memory 
> per instance of the enclosing class.
> Came across DataNodeProperties as a non static inner class defined in 
> MiniDFSCluster without holding any implicit reference to MiniDFSCluster. 
> Taking this opportunity to find other non-static inner classes that are not 
> holding implicit reference to their respective enclosing instances.



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