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https://issues.apache.org/jira/browse/TRAFODION-647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113918#comment-16113918
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ASF GitHub Bot commented on TRAFODION-647:
------------------------------------------
GitHub user CoderSong2015 opened a pull request:
https://github.com/apache/incubator-trafodion/pull/1198
[TRAFODION-647]Make threshold of compression configurable
In Windows,you need to modify the registry to set the compression threshold.
In Linux,you need to set the threshold by DSN file like:
[Default_DataSource]
...
Compression = balance
CompressionThreshold = 3000
...
You also can config it by connection string like:
"DSN=Default_DataSource;USER=XX;PWD=XXX;CompressionThreshold=3000"
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/CoderSong2015/incubator-trafodion master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-trafodion/pull/1198.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 #1198
----
commit a731155a95df05b41ad780a8254a60faada79027
Author: CoderSong2015 <[email protected]>
Date: 2017-08-04T03:36:14Z
Make threshold of compression configurable in linux
commit c181c842beb1c8c9617c1c5db507d672eff0ea46
Author: CoderSong2015 <[email protected]>
Date: 2017-08-04T03:48:18Z
Make threshold of compression configurable in windows
----
> LP Bug: 1371452 - allow user to set starting compress threshold value in odbc
> driver
> ------------------------------------------------------------------------------------
>
> Key: TRAFODION-647
> URL: https://issues.apache.org/jira/browse/TRAFODION-647
> Project: Apache Trafodion
> Issue Type: Bug
> Components: client-odbc-linux, client-odbc-windows,
> connectivity-dcs, connectivity-mxosrvr
> Reporter: Daniel Lu
> Assignee: Daniel Lu
>
> Currently, driver compression is turned on by the DSN setting
> "Compression=?", but still, if the sending buffer size is too small, we do
> not compress it. because in this case the time would be taken by
> compress+extract code, very possible longer than actually transmit time of
> the small buffer. so we have a hard code threshold value for this in driver
> and server. but we know what is the best value for this depend on actual H/W
> and network delay. so hard code is not a good option. we need to externalize
> it to outside user. for driver, we can put it in DSN setting, but for server
> side, a new property is required for DCS server, we need consider about it.
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