GitHub user ndwangsen reopened a pull request:
https://github.com/apache/carbondata/pull/2314
[CARBONDATA-2309][DataLoad] Add strategy to generate bigger carbondata
files in case of small amoâ¦
In some scenario, the input amount of loading data is small, but carbondata
still distribute them to each executors (nodes) to do local-sort, thus
resulting to small carbondata files generated by each executor.
In some extreme conditions, if the cluster is big enough or if the amount
of data is small enough, the carbondata file contains only one blocklet or page.
I think a new strategy should be introduced to solve the above problem.
The new strategy should:
be able to control the minimum amount of input data for each node
ignore data locality otherwise it may always choose a small portion of
particular nodes
Be sure to do all of the following checklist to help us incorporate
your contribution quickly and easily:
- [ ] Any interfaces changed?
NO
- [ ] Any backward compatibility impacted?
NO
- [ ] Document update required?
YES
- [ ] Testing done
Please provide details on
- Whether new unit test cases have been added or why no new tests
are required?
YES
- How it is tested? Please attach test report.
Tested in local
- Is it a performance related change? Please attach the performance
test report.mac
After this PR, performance is as we expected
- Any additional information to help reviewers in testing this
change.
NO
- [ ] For large changes, please consider breaking it into sub-tasks under
an umbrella JIRA.
NO
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ndwangsen/incubator-carbondata load_min
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/carbondata/pull/2314.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2314
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commit 987921ef4d1c16e01b5c46384b8b1c356e3abe8a
Author: ndwangsen <luffy.wang@...>
Date: 2018-05-17T09:26:00Z
Add strategy to generate bigger carbondata files in case of small amount of
input data
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