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https://issues.apache.org/jira/browse/HADOOP-13203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336378#comment-15336378
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Steve Loughran commented on HADOOP-13203:
-----------------------------------------
Performance of the HADOOP-13286 patch
{code}
testDecompression128K: Decompress with a 128K readahead
2016-06-17 17:14:57,072 [Thread-0] INFO compress.CodecPool
(CodecPool.java:getDecompressor(181)) - Got brand-new decompressor [.gz]
2016-06-17 17:15:32,986 [Thread-0] INFO contract.ContractTestUtils
(ContractTestUtils.java:end(1262)) - Duration of Time to read 514690 lines
[99896260 bytes expanded, 22633778 raw] with readahead = 131072: 36,078,064,490
nS
2016-06-17 17:15:32,986 [Thread-0] INFO scale.TestS3AInputStreamPerformance
(TestS3AInputStreamPerformance.java:logTimePerIOP(144)) - Time per IOP: 70,096
nS
2016-06-17 17:15:32,987 [Thread-0] INFO scale.TestS3AInputStreamPerformance
(TestS3AInputStreamPerformance.java:logStreamStatistics(306)) - Stream
Statistics
StreamStatistics{OpenOperations=175, CloseOperations=175, Closed=175,
Aborted=0, SeekOperations=0, ReadExceptions=0, ForwardSeekOperations=0,
BackwardSeekOperations=0, BytesSkippedOnSeek=0, BytesBackwardsOnSeek=0,
BytesRead=22633778, BytesRead excluding skipped=22633778, ReadOperations=6680,
ReadFullyOperations=0, ReadsIncomplete=1583}
{code}
> S3a: Consider reducing the number of connection aborts by setting correct
> length in s3 request
> ----------------------------------------------------------------------------------------------
>
> Key: HADOOP-13203
> URL: https://issues.apache.org/jira/browse/HADOOP-13203
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Minor
> Attachments: HADOOP-13203-branch-2-001.patch,
> HADOOP-13203-branch-2-002.patch, HADOOP-13203-branch-2-003.patch,
> HADOOP-13203-branch-2-004.patch, stream_stats.tar.gz
>
>
> Currently file's "contentLength" is set as the "requestedStreamLen", when
> invoking S3AInputStream::reopen(). As a part of lazySeek(), sometimes the
> stream had to be closed and reopened. But lots of times the stream was closed
> with abort() causing the internal http connection to be unusable. This incurs
> lots of connection establishment cost in some jobs. It would be good to set
> the correct value for the stream length to avoid connection aborts.
> I will post the patch once aws tests passes in my machine.
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