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From watermen <>
Subject [GitHub] incubator-carbondata pull request #719: [WIP][CARBONDATA-844] Avoid to get u...
Date Sat, 01 Apr 2017 09:13:07 GMT
GitHub user watermen opened a pull request:

    [WIP][CARBONDATA-844] Avoid to get useless splits

    In current implements of CarbonInputFormat.getDataBlocksOfSegment, 
    1. Get all of the carbondata splits in segments directory.
    2. Read the carbonindex and construct the B-tree.
    3. Apply filter and get matching splits.
    I think we get some useless splits and the operator of getSplits is expensive. So we'd
better to do the getSplits after filter:
    1. List the segment directory, and filter the path of carbonindex.
    2. Read the carbonindex and construct the B-tree.
    3. Apply filter and get matching blocks.
    4. Get carbondata splits from filtered blocks.
    - [ ] How to do something about IUD(isValidBlockBasedOnUpdateDetails)?
    - [ ] Fix bug in suite
    @jackylk @QiangCai Plz review the code when you have time.

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

    $ git pull CARBONDATA-844

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 #719
commit 0de95cb219300c7127c70a3f7e126960ee354e58
Author: Yadong Qi <>
Date:   2017-04-01T08:42:38Z

    Avoid to get useless splits.


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