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From xuchuanyin <>
Subject [GitHub] carbondata pull request #1198: [CARBONDATA-1281] Support multiple temp dirs ...
Date Wed, 26 Jul 2017 14:05:54 GMT
GitHub user xuchuanyin reopened a pull request:

    [CARBONDATA-1281] Support multiple temp dirs for writing files while loading data

    # Modifications
    This feature mainly focus on avoiding disk hot-spot in single massive data loading, changes
are made in two parts: 
    1. randomly choose a yarn local folder while writing sort temp file each time in sort-process;
    2.randomly choose a yarn local folder while writing carbondata file each time in write-process.
    # Usage
    To enable this feature, user should enable `carbon.use.multi.temp.dir=true` and `carbon.use.local.dir=true`.
    # Performance
    In my case, this feature improves the loading performance from 35M/s/node to 70+M/s/node

You can merge this pull request into a Git repository by running:

    $ git pull new_feature_mtd4l

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1198
commit 46da65a1a0579c62a7f4196ae622f83dd5197e3a
Author: xuchuanyin <>
Date:   2017-07-25T11:17:53Z

    Support multiple temp dirs for writing files while loading data
    randomly choose a dir to write sort temp files
    randomly choose a dir to write carbondata files
    Fix errors in spelling
    optimize default value for using multiple temp dir
    update document for multiple temp dirs feature
    update property name
    (cherry picked from commit 71ab293ef8d2ff24a122bb074b7b95bca8c1b77e)

commit 6e35dec70196a12aaac24a69c795d3597f946386
Author: xuchuanyin <>
Date:   2017-07-25T11:20:32Z

    Add tests for multiple temp dirs during data loading
    Fix bugs in tests
    remove header in test data
    remove useless comment
    remove added useless testdata
    update data source for tests
    (cherry picked from commit ee355b78c0d703d5bc2d2767837c32b6cc422361)

commit 3e633070c3f793867c03ba350048994ced0e5527
Author: xuchuanyin <>
Date:   2017-07-25T12:28:17Z

    resolve review comments
    + update documents
    + update parameter name
    + optimize code to avoid duplicate lines

commit 9f746178600d7c16267bd0276b8a492f69871802
Author: xuchuanyin <>
Date:   2017-07-25T12:42:35Z

    fix checkstyle error


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