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From "Sital Kedia (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-14542) PipeRDD should allow configurable buffer size for the stdin writer
Date Mon, 11 Apr 2016 22:05:25 GMT

     [ https://issues.apache.org/jira/browse/SPARK-14542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sital Kedia updated SPARK-14542:
--------------------------------
    Description: Currently {code}PipedRDD{code} internally uses PrintWriter to write data
to the stdin of the piped process, which by default uses a BufferedWriter of buffer size 8k.
In our experiment, we have seen that 8k buffer size is too small and the job spends significant
amount of CPU time in system calls to copy the data. We should have a way to configure the
buffer size for the writer.   (was: Currently PipedRDD internally uses PrintWriter to write
data to the stdin of the piped process, which by default uses a BufferedWriter of buffer size
8k. In our experiment, we have seen that 8k buffer size is too small and the job spends significant
amount of CPU time in system calls to copy the data. We should have a way to configure the
buffer size for the writer. )

> PipeRDD should allow configurable buffer size for the stdin writer 
> -------------------------------------------------------------------
>
>                 Key: SPARK-14542
>                 URL: https://issues.apache.org/jira/browse/SPARK-14542
>             Project: Spark
>          Issue Type: Improvement
>    Affects Versions: 1.6.1
>            Reporter: Sital Kedia
>            Priority: Minor
>
> Currently {code}PipedRDD{code} internally uses PrintWriter to write data to the stdin
of the piped process, which by default uses a BufferedWriter of buffer size 8k. In our experiment,
we have seen that 8k buffer size is too small and the job spends significant amount of CPU
time in system calls to copy the data. We should have a way to configure the buffer size for
the writer. 



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