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https://issues.apache.org/jira/browse/HDFS-7276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14197089#comment-14197089
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stack commented on HDFS-7276:
-----------------------------
I was thinking it was because 20480 * 130, my packet size, was too big but this
is 24G heap. Setting the size down to 10k, it still hangs when it runs up to
10k -- see below -- even if I set the reset down to 10 seconds again. To
check, I disabled this feature and it ran to completion. Let me know if I can
help debug.
{code}
2014-11-04 15:12:42,468 DEBUG [sync.0] util.ByteArrayManager: allocate(65565):
count=55559, aboveThreshold, [131072: 9999/10000, free=1], recycled? true
2014-11-04 15:12:42,468 DEBUG [ResponseProcessor for block
BP-410607956-10.20.84.26-1391491814882:blk_1075488661_1099513376778]
util.ByteArrayManager: recycle: array.length=131072, [131072: 10000/10000,
free=0], notifyAll, freeQueue.offer, freeQueueSize=1
101143,1 99%
2014-11-04 15:12:42,468 DEBUG [sync.0] util.ByteArrayManager: allocate(65565):
count=55559, aboveThreshold, [131072: 9999/10000, free=1], recycled? true
2014-11-04 15:12:42,468 DEBUG [ResponseProcessor for block
BP-410607956-10.20.84.26-1391491814882:blk_1075488661_1099513376778]
util.ByteArrayManager: recycle: array.length=131072, [131072: 10000/10000,
free=0], notifyAll, freeQueue.offer, freeQueueSize=1
2014-11-04 15:12:42,468 DEBUG [sync.1] util.ByteArrayManager: allocate(65565):
count=55560, aboveThreshold, [131072: 9999/10000, free=1], recycled? true
2014-11-04 15:12:42,469 DEBUG [sync.2] util.ByteArrayManager: allocate(65565):
count=55561, aboveThreshold, [131072: 10000/10000, free=0]: wait ...
2014-11-04 15:12:42,469 DEBUG [ResponseProcessor for block
BP-410607956-10.20.84.26-1391491814882:blk_1075488661_1099513376778]
util.ByteArrayManager: recycle: array.length=131072, [131072: 10000/10000,
free=0], notifyAll, freeQueue.offer, freeQueueSize=1
2014-11-04 15:12:42,469 DEBUG [sync.2] util.ByteArrayManager: wake up: [131072:
9999/10000, free=1], recycled? true
2014-11-04 15:12:42,469 DEBUG [sync.3] util.ByteArrayManager: allocate(65565):
count=55562, aboveThreshold, [131072: 10000/10000, free=0]: wait ...
2014-11-04 15:12:42,469 DEBUG [ResponseProcessor for block
BP-410607956-10.20.84.26-1391491814882:blk_1075488661_1099513376778]
util.ByteArrayManager: recycle: array.length=131072, [131072: 10000/10000,
free=0], notifyAll, freeQueue.offer, freeQueueSize=1
2014-11-04 15:12:42,469 DEBUG [sync.3] util.ByteArrayManager: wake up: [131072:
9999/10000, free=1], recycled? true
2014-11-04 15:12:42,469 DEBUG [sync.4] util.ByteArrayManager: allocate(65565):
count=55563, aboveThreshold, [131072: 10000/10000, free=0]: wait ...
2014-11-04 15:12:42,470 DEBUG [ResponseProcessor for block
BP-410607956-10.20.84.26-1391491814882:blk_1075488661_1099513376778]
util.ByteArrayManager: recycle: array.length=131072, [131072: 10000/10000,
free=0], notifyAll, freeQueue.offer, freeQueueSize=1
2014-11-04 15:12:42,470 DEBUG [sync.4] util.ByteArrayManager: wake up: [131072:
9999/10000, free=1], recycled? true
2014-11-04 15:12:42,470 DEBUG [sync.0] util.ByteArrayManager: allocate(65565):
count=55564, aboveThreshold, [131072: 10000/10000, free=0]: wait ...
...
{code}
> 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
> Fix For: 2.6.0
>
> Attachments: h7276_20141021.patch, h7276_20141022.patch,
> h7276_20141023.patch, h7276_20141024.patch, h7276_20141027.patch,
> h7276_20141027b.patch, h7276_20141028.patch, h7276_20141029.patch,
> h7276_20141029b.patch, h7276_20141030.patch, h7276_20141031.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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