GitHub user ravipesala opened a pull request:
https://github.com/apache/carbondata/pull/1999
[CARBONDATA-2204] Optimized number of reads of tablestatus file while
querying
As per the analysis of @xuchuanyin the number of reads of table status
files while querying goes to 7 times for first query and 5 times for second
query onwards.
This PR avoid reading status file multiple times. For first time query, it
reads 2 times(Needed for datamap refresher) and 1 time for second query
onwards.
Be sure to do all of the following checklist to help us incorporate
your contribution quickly and easily:
- [ ] Any interfaces changed?
- [ ] Any backward compatibility impacted?
- [ ] Document update required?
- [ ] Testing done
Please provide details on
- Whether new unit test cases have been added or why no new tests
are required?
- How it is tested? Please attach test report.
- Is it a performance related change? Please attach the performance
test report.
- Any additional information to help reviewers in testing this
change.
- [ ] For large changes, please consider breaking it into sub-tasks under
an umbrella JIRA.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ravipesala/incubator-carbondata
tablestatus-read
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/carbondata/pull/1999.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 #1999
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commit 12ebff124664e3621f7cab95bea46a94bb4b036a
Author: ravipesala <ravi.pesala@...>
Date: 2018-02-26T13:06:03Z
Optimized number of reads of tablestatus file while querying
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