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Omkar Aradhya K S commented on HADOOP-14407: -------------------------------------------- {quote} Also, we will do more investigations into introducing both input and output copybuffersize configurations. {quote} We did a small set of runs to see at what level the copybuffersize stagnates in performance: !TotalTime-vs-CopyBufferSize.jpg! In this case, with copybuffersize set to just 128KB, we get >3x performance! {quote} If there is benefit of doing this I will submit a new patch with the changes or else we will go ahead with this patch. {quote} Since even a small increase in the copybuffersize give the desired performance, we will not need two separate copybuffersize for input and output. > DistCp - Introduce a configurable copy buffer size > -------------------------------------------------- > > Key: HADOOP-14407 > URL: https://issues.apache.org/jira/browse/HADOOP-14407 > Project: Hadoop Common > Issue Type: Improvement > Components: tools/distcp > Affects Versions: 2.9.0 > Reporter: Omkar Aradhya K S > Assignee: Omkar Aradhya K S > Fix For: 2.9.0, 3.0.0-alpha3 > > Attachments: HADOOP-14407.001.patch, HADOOP-14407.002.patch, > TotalTime-vs-CopyBufferSize.jpg > > > Currently, the RetriableFileCopyCommand has a fixed copy buffer size of just > 8KB. We have noticed in our performance tests that with bigger buffer sizes > we saw upto ~3x performance boost. Hence, making the copy buffer size a > configurable setting via the new parameter <copybuffersize>. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org