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Posted to codereview@trafodion.apache.org by eowhadi <gi...@git.apache.org> on 2016/01/25 18:52:49 UTC
[GitHub] incubator-trafodion pull request: [TRAFODION-1420] Use ClientSmall...
GitHub user eowhadi opened a pull request:
https://github.com/apache/incubator-trafodion/pull/284
[TRAFODION-1420] Use ClientSmallScanner for small scans to improve performance
Hbase implements an optimization for small scan (defined as scanning less than a data block ie 64Kb) resulting in 3X performance improvement. The underlying trick is about cutting down RPC calls from 3 (OpenScan/Next/Close) to 1, and use pread stateless instead of seek/read state-full and locking method to read data. This JIRA is about improving the compiler who can be aware if a scan will be acting on single data block (small) or not, and pass this data to executor so that it can use the right parameter for scan. (scan.setSmall(boolean)).
reference:
https://issues.apache.org/jira/browse/HBASE-9488
https://issues.apache.org/jira/browse/HBASE-7266
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/eowhadi/incubator-trafodion smallScanner
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-trafodion/pull/284.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 #284
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commit 49a06f8be5f2c35b4f6ea20fd4220143addddc7a
Author: Eric Owhadi <er...@esgyn.com>
Date: 2016-01-25T17:40:50Z
Implement TRAFODION-1420 Use ClientSmallScanner for small scans to improve perdormance
Hbase implements an optimization for small scan (defined as scanning less than a data block ie 64Kb) resulting in 3X performance improvement. The underlying trick is about cutting down RPC calls from 3 (OpenScan/Next/Close) to 1, and use pread stateless instead of seek/read state-full and locking method to read data. This JIRA is about improving the compiler who can be aware if a scan will be acting on single data block (small) or not, and pass this data to executor so that it can use the right parameter for scan. (scan.setSmall(boolean)).
reference:
https://issues.apache.org/jira/browse/HBASE-9488
https://issues.apache.org/jira/browse/HBASE-7266
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[GitHub] incubator-trafodion pull request: [TRAFODION-1420] Use ClientSmall...
Posted by asfgit <gi...@git.apache.org>.
Github user asfgit closed the pull request at:
https://github.com/apache/incubator-trafodion/pull/284
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