Yiqun Lin created HDFS-10691:
--------------------------------
Summary: 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
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 happened 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-steps}}, maxSize]. For example, if the size of one file is
104400000, 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.
The exception will happens when {{maxSize}} can not be divided by {{step}}. 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 + steps) > maxSize ?
distribution.length - 1
: (int) Math.ceil((double) fileSize / steps);
{code}
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