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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10691) FileDistribution fails in hdfs oiv command due to ArrayIndexOutOfBoundsException
Date Fri, 29 Jul 2016 11:48:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yiqun Lin updated HDFS-10691:
-----------------------------
    Attachment: HDFS-10691-branch-2.7.patch

> FileDistribution fails in hdfs oiv command due to ArrayIndexOutOfBoundsException
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-10691
>                 URL: https://issues.apache.org/jira/browse/HDFS-10691
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>             Fix For: 2.8.0, 3.0.0-alpha2
>
>         Attachments: HDFS-10691-branch-2.7.patch, HDFS-10691.001.patch, HDFS-10691.002.patch,
HDFS-10691.003.patch
>
>
> I use hdfs oiv -p FileDistribution command to do a file analyse. But the {{ArrayIndexOutOfBoundsException}}
happened and lead the process terminated. The stack infos:
> {code}
> Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 103
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.FileDistributionCalculator.run(FileDistributionCalculator.java:243)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.FileDistributionCalculator.visit(FileDistributionCalculator.java:176)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewerPB.run(OfflineImageViewerPB.java:176)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewerPB.main(OfflineImageViewerPB.java:129)
> {code}
> I looked into the code and I found the exception was threw in increasing count of {{distribution}}.
And the reason for the exception is that the bucket number was more than the distribution's
length.
> Here are my steps:
> 1).The input command params:
> {code}
> hdfs oiv -p FileDistribution -maxSize 104857600 -step 1024000
> {code}
> The {{numIntervals}} in code should be 104857600/1024000 =102(real value:102.4), so the
{{distribution}}'s length should be {{numIntervals}} + 1 = 103.
> 2).The {{ArrayIndexOutOfBoundsException}} will happens when the file size is in range
((maxSize/step)*step, maxSize]. For example, if the size of one file is 104800000, and it's
in range of size as mentioned before. And the bucket number is calculated as 104800000/1024000=102.3,
then in code we do the {{Math.ceil}} of this, so the final value should be 103. But the {{distribution}}'s
length is also 103, it means the index is from 0 to 102. So the {{ArrayIndexOutOfBoundsException}}
happens.
> In a word, the exception will happens when {{maxSize}} can not be divided by {{step}}
and meanwhile the size of file is in range ((maxSize/step)*step, maxSize]. The related logic
should be changed from 
> {code}
> int bucket = fileSize > maxSize ? distribution.length - 1 : (int) Math
>             .ceil((double)fileSize / steps);
> {code}
> to 
> {code}
> int bucket =
>             fileSize >= maxSize || fileSize > (maxSize / steps) * steps ?
>                 distribution.length - 1 : (int) Math.ceil((double) fileSize / steps);
> {code}



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