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From Eric Newton <>
Subject Re: Accumulo on MapR Continued - LargeRowTest
Date Wed, 18 Apr 2012 17:50:47 GMT
The latelastcontact test was recently re-written, so it will work in the
next release.

You could configure and run the continuous ingest and random walk tests.
 We run them for 24 hours, with agitation (random server kill) and without
prior to a release.

These are more likely to stress the underlying filesystem.


On Wed, Apr 18, 2012 at 1:17 PM, Keys Botzum <> wrote:

> Thanks to the help of Keith, Todd, and Eric, as well as MapR engineering,
> all of the Accumulo tests is test/system/auto are now passing. Note that
> the latelastcontact test only passes if I actually install zookeeper on the
> host. This is because of the dependency on that I mentioned
> earlier.
> The final piece of the puzzle was that MapR does aggressive read ahead
> caching of data as well as aggregation of writes to improve performance. As
> with Hbase, we don't think this type of behavior is helpful with something
> like Accumulo. In our specific case, the interaction between Accumulo and
> MapR's behavior results in the large row test failing.
> So now I have one more question. To disable the caching and aggregation
> behavior, we need to set these properties:
> <property>
> <name>fs.mapr.readbuffering</name>
> <value>false</value>
> </property>
> <property>
> <name>fs.mapr.aggregate.writes</name>
> <value>false</value>
> </property>
> If I set them in core-site.xml they of course work but that's a global
> setting. I want to only affect Accumulo. If I set them in
> accumulo-site.xml, I presume they take effect for normal Accumulo usage,
> but I'm nearly certain that settings in accumulo-site.xml do not affect the
> tests as I posted earlier. How can I set those two properties in a way that
> will cause the tests temporary configuration to take them into account? I
> tried editing TestUtilsMixin settings as did work for the
> Accumulo property table.file.compress.type, but the MapR related properties
> don't seem to take. Ideas?
> Also, if all of the auto tests pass successfully do you feel comfortable
> that the testing was sufficient or do you recommend running additional
> tests?
> Thanks!
> Keys
> ________________________________
> Keys Botzum
> Senior Principal Technologist
> WW Systems Engineering
> 443-718-0098
> MapR Technologies

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