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https://issues.apache.org/jira/browse/HDFS-7276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185849#comment-14185849
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Tsz Wo Nicholas Sze commented on HDFS-7276:
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- nAllocations=65536
{noformat}
arrayLength=65536, nThreads=256, nAllocations=65536, maxArrays=1024
NewByteArrayWithoutLimit: 13347
NewByteArrayWithLimit: 13335
UsingByteArrayManager: 12970
arrayLength=65536, nThreads=256, nAllocations=65536, maxArrays=4096
NewByteArrayWithoutLimit: 13266
NewByteArrayWithLimit: 13269
UsingByteArrayManager: 12859
arrayLength=65536, nThreads=256, nAllocations=65536, maxArrays=16384
NewByteArrayWithoutLimit: 13270
NewByteArrayWithLimit: 13279
UsingByteArrayManager: 12886
arrayLength=65536, nThreads=256, nAllocations=65536, maxArrays=65536
NewByteArrayWithoutLimit: 13287
NewByteArrayWithLimit: 13276
UsingByteArrayManager: 12886
arrayLength=65536, nThreads=256, nAllocations=65536, maxArrays=262144
NewByteArrayWithoutLimit: 13344
NewByteArrayWithLimit: 13324
UsingByteArrayManager: 12906
{noformat}
> Limit the number of byte arrays used by DFSOutputStream
> -------------------------------------------------------
>
> Key: HDFS-7276
> URL: https://issues.apache.org/jira/browse/HDFS-7276
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Attachments: h7276_20141021.patch, h7276_20141022.patch,
> h7276_20141023.patch, h7276_20141024.patch, h7276_20141027.patch
>
>
> When there are a lot of DFSOutputStream's writing concurrently, the number of
> outstanding packets could be large. The byte arrays created by those packets
> could occupy a lot of memory.
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