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https://issues.apache.org/jira/browse/HDFS-5517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15710421#comment-15710421
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Hudson commented on HDFS-5517:
------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10921 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/10921/])
HDFS-5517. Lower the default maximum number of blocks per file. (wang: rev
7226a71b1f684f562bd88ee121f1dd7aa8b73816)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDirectoryScanner.java
> 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-5517.003.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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