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https://issues.apache.org/jira/browse/HADOOP-17128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17159411#comment-17159411
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Wei-Chiu Chuang commented on HADOOP-17128:
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thanks for filing the jira? Are you proposing to increase outputBufferCapacity 
to 1MB (=1024*1024)?

> double buffer memory size hard code
> -----------------------------------
>
>                 Key: HADOOP-17128
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17128
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ha
>    Affects Versions: 2.7.7
>         Environment: 
> D:\hadoop-2.7.0-src\hadoop-hdfs-project\hadoop-hdfs\src\main\java\org\apache\hadoop\hdfs\qjournal\client\QuorumJournalManager.java
>            Reporter: David Wei
>            Priority: Major
>             Fix For: site
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> private int outputBufferCapacity = 512 * 1024;



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