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https://issues.apache.org/jira/browse/HDFS-5517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583770#comment-15583770
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Hadoop QA commented on HDFS-5517:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  7s{color} 
| {color:red} HDFS-5517 does not apply to trunk. Rebase required? Wrong Branch? 
See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-5517 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12614116/HDFS-5517.patch |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17189/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


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> 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
>         Attachments: 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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