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From "Adam Fuchs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7380) unsteady and slow performance when writing to file with block size >2GB
Date Fri, 07 Nov 2014 22:38:34 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Adam Fuchs updated HDFS-7380:
-----------------------------
    Attachment: BenchmarkWrites.java

> unsteady and slow performance when writing to file with block size >2GB
> -----------------------------------------------------------------------
>
>                 Key: HDFS-7380
>                 URL: https://issues.apache.org/jira/browse/HDFS-7380
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Adam Fuchs
>         Attachments: BenchmarkWrites.java
>
>
> Appending to a large file with block size > 2GB can lead to periods of really poor
performance (4X slower than optimal). I found this issue when looking at Accmulo write performance
in ACCUMULO-3303. I wrote a small test application to isolate this performance down to some
basic API calls (to be attached). A description of the execution can be found here: https://issues.apache.org/jira/browse/ACCUMULO-3303?focusedCommentId=14202830&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14202830
> The specific hadoop version was as follows:
> {code}
> [root@n1 ~]# hadoop version
> Hadoop 2.4.0.2.1.2.0-402
> Subversion git@github.com:hortonworks/hadoop.git -r 9e5db004df1a751e93aa89b42956c5325f3a4482
> Compiled by jenkins on 2014-04-27T22:28Z
> Compiled with protoc 2.5.0
> From source with checksum 9e788148daa5dd7934eb468e57e037b5
> This command was run using /usr/lib/hadoop/hadoop-common-2.4.0.2.1.2.0-402.jar
> {code}



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