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https://issues.apache.org/jira/browse/HDFS-14240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757595#comment-16757595
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Masatake Iwasaki commented on HDFS-14240:
-----------------------------------------
{quote}roblem is here:array datanodes's length is determined by args as
"-datanodes" or "-threads" ，but dnIdx = dnInfo.getXferPort() is a random port.
{quote}
NNThroughputBenchmark registers fake datanode having port number based on idx
if using in-process NameNode. The code path assuming the mode seems to be
reached in the mode using real NameNode.
[~shenyinjie] if you can show the command line to reproduce the issue, it would
be help.
[~RANith] I assigned you to this ticket.
> blockReport test in NNThroughputBenchmark throws
> ArrayIndexOutOfBoundsException
> -------------------------------------------------------------------------------
>
> Key: HDFS-14240
> URL: https://issues.apache.org/jira/browse/HDFS-14240
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Shen Yinjie
> Assignee: Ranith Sardar
> Priority: Major
> Attachments: screenshot-1.png
>
>
> When I run a blockReport test with NNThroughputBenchmark,
> BlockReportStats.addBlocks() throws ArrayIndexOutOfBoundsException.
> digging the code:
> {code:java}
> for(DatanodeInfo dnInfo : loc.getLocations())
> { int dnIdx = dnInfo.getXferPort() - 1;
> datanodes[dnIdx].addBlock(loc.getBlock().getLocalBlock());{code}
>
> problem is here:array datanodes's length is determined by args as
> "-datanodes" or "-threads" ，but dnIdx = dnInfo.getXferPort() is a random port.
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