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https://issues.apache.org/jira/browse/HDFS-7276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze updated HDFS-7276:
--------------------------------------
Attachment: h7276_20141027b.patch
h7276_20141027b.patch: configurable parameters and formatted the performance
tests output.
{noformat}
arrayLength=65536, nThreads=512, nAllocations=16384, maxArrays=1024
NewByteArrayWithoutLimit: 1748, 1795, 1808, 1789, 1824, avg =
1792.800
NewByteArrayWithLimit: 1814, 1801, 1805, 1809, 1827, avg =
1811.200
UsingByteArrayManager: 1740, 1735, 1723, 1734, 1714, avg =
1729.200
{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,
> h7276_20141027b.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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