Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
Sqoop, mail # dev - Review Request: SQOOP-604 Easy throttling feature for MySQL exports


Copy link to this message
-
Re: Review Request: SQOOP-604 Easy throttling feature for MySQL exports
Abhijeet Gaikwad 2012-10-03, 14:25


> On Oct. 2, 2012, 3:45 p.m., Abhijeet Gaikwad wrote:
> > src/java/org/apache/sqoop/mapreduce/MySQLExportMapper.java, line 342
> > <https://reviews.apache.org/r/7135/diff/3/?file=172556#file172556line342>
> >
> >     You meant checkpointSleepMs?

Seems this is not yet resolved.
- Abhijeet
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/7135/#review12099
-----------------------------------------------------------
On Oct. 2, 2012, 4:08 p.m., Zoltán Tóth-Czifra wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/7135/
> -----------------------------------------------------------
>
> (Updated Oct. 2, 2012, 4:08 p.m.)
>
>
> Review request for Sqoop.
>
>
> Description
> -------
>
> Code review for SQOOP-604, see https://issues.apache.org/jira/browse/SQOOP-604
>
> The solution in short: Using the already existing "checkpoint" feature of the direct (--direct) MySQL exports (the export process is restarted every X bytes written), extending it with a new config value that would simply make the thread sleep for X milliseconds at the checkbpoints. With low enough byte count limit this can be a simple yet powerful throttling mechanism.
>
>
> Diffs
> -----
>
>   src/java/org/apache/sqoop/mapreduce/MySQLExportMapper.java a4e8b88
>
> Diff: https://reviews.apache.org/r/7135/diff/
>
>
> Testing
> -------
>
> Executing with different settings of sqoop.mysql.export.checkpoint.bytes and sqoop.mysql.export.sleep.ms:
>
> 33554432B / 0ms: Transferred 4.7579 MB in 8.7175 seconds (558.8826 KB/sec)
> 102400B / 500ms: Transferred 4.7579 MB in 35.7794 seconds (136.1698 KB/sec)
> 51200B / 500ms: Transferred 4.758 MB in 57.8675 seconds (84.1959 KB/sec)
> 51200B / 250ms: Transferred 4.7579 MB in 35.0293 seconds (139.0854 KB/sec)
>
> I did not add unit tests yet and as it involves calling to Thread.sleep, I find testing this difficult. Unfortunately there is no "machine" or "environment" object that could be injected to these classes as mocks that could take care of time-related fixtures.
>
>
> Thanks,
>
> Zoltán Tóth-Czifra
>
>