GitHub user blfritch-esgyn opened a pull request:
https://github.com/apache/incubator-trafodion/pull/484
[TRAFODION-1974] Limit HBase cache size for ustat direct sampling
This is not a definitive fix for the issue of timeouts during Update
Statistics processing for very large tables, but should decrease the
frequency of such occurrences. It extends the fix for TRAFODION-1740
(SHA-1 99a143f29910c7d3c8e02fb1bf101214568bf80a, Dave Birdsall), which
modified the CQDs controlling HBase cache size based on the sampling
rate when the ustat sample table is populated. This commit does the
same thing when the sample can be read directly into memory from the
table being sampled.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/blfritch-esgyn/incubator-trafodion
TRAFODION-1974
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-trafodion/pull/484.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 #484
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commit 899273e1f211496650d9da4fdb92ede2b2ba2f26
Author: Barry Fritchman <[email protected]>
Date: 2016-05-14T06:21:30Z
[TRAFODION-1974] Limit HBase cache size for ustat direct sampling
This is not a definitive fix for the issue of timeouts during Update
Statistics processing for very large tables, but should decrease the
frequency of such occurrences. It extends the fix for TRAFODION-1740
(SHA-1 99a143f29910c7d3c8e02fb1bf101214568bf80a, Dave Birdsall), which
modified the CQDs controlling HBase cache size based on the sampling
rate when the ustat sample table is populated. This commit does the
same thing when the sample can be read directly into memory from the
table being sampled.
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