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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5517) Lower the default maximum number of blocks per file
Date Tue, 29 Nov 2016 08:40:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15704679#comment-15704679
] 

Hudson commented on HDFS-5517:
------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10904 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/10904/])
HDFS-5517. Lower the default maximum number of blocks per file. (wang: rev 09451252fae90a3ec192b8d7f0c49508df65e8c5)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml


> Lower the default maximum number of blocks per file
> ---------------------------------------------------
>
>                 Key: HDFS-5517
>                 URL: https://issues.apache.org/jira/browse/HDFS-5517
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.2.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>              Labels: BB2015-05-TBR
>             Fix For: 3.0.0-alpha2
>
>         Attachments: HDFS-5517.002.patch, HDFS-5517.patch
>
>
> We introduced the maximum number of blocks per file in HDFS-4305, but we set the default
to 1MM. In practice this limit is so high as to never be hit, whereas we know that an individual
file with 10s of thousands of blocks can cause problems. We should lower the default value,
in my opinion to 10k.



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