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From Steve Lihn <stevel...@gmail.com>
Subject Re: Compaction-pool pause -- was: Cluster-wide pause
Date Thu, 01 Jul 2010 15:35:43 GMT
This problem was solved by forming a 3-node large-instance cluster. The
pause went away. I thought I would try a single node configuration to test
the intensive inserts, as you would expect to just work (though may not
performing well). It turns out somehow Cassandra likes to have a minimum
amount of clustering. If my experiment is correct, maybe this should be
mentioned on the wiki; or else the single node configuration should be
improved to at least work smoothly albeit slower.

On Wed, Jun 30, 2010 at 3:21 PM, Steve Lihn <stevelihn@gmail.com> wrote:

> Jon,
> Looks like this compaction process took 360 seconds. What is it and how do
> I avoid it?
>
> INFO [COMPACTION-POOL:1] 2010-06-30 14:56:08,667 CompactionManager.java
> (line 246) Compacting
> [org.apache.cassandra.io.SSTableReader(path='/mnt/itops/cdata/TFO/CurrentHolding-129-Data.db'),org.apache.cassandra.io.SSTableReader(path='/mnt/itops/cdata/TFO/CurrentHolding-150-Data.db'),org.apache.cassandra.io.SSTableReader(path='/mnt/itops/cdata/TFO/CurrentHolding-172-Data.db'),org.apache.cassandra.io.SSTableReader(path='/mnt/itops/cdata/TFO/CurrentHolding-194-Data.db')]
>  INFO [COMPACTION-POOL:1] 2010-06-30 15:02:09,537 CompactionManager.java
> (line 326) Compacted to /mnt/itops/cdata/TFO/CurrentHolding-197-Data.db.
> 1880884459/1880884459 bytes for 6306383 keys.  Time: 360870ms.
>
> On Wed, Jun 30, 2010 at 3:12 PM, Steve Lihn <stevelihn@gmail.com> wrote:
>
>> Jon,
>> I am experimenting writing 8 million rows into Cassandra and also
>> experienced some random timeouts, even with 10-second timeout parameter.
>> How do I avoid such timeout at all cost? (I.e. At this time, my priority
>> is to finish the end-to-end test. Don't want the program to fail at all.)
>> This is a one-node server with ms1G and mx2GB. The rest in
>> cassandra.in.sh are default I think.
>>
>> Steve
>>
>>
>>

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