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From Maxim Potekhin <potek...@bnl.gov>
Subject Re: Is the secondary index re-built under compaction?
Date Tue, 17 Apr 2012 14:09:00 GMT
I understand that indexes are CFs. But the compaction stats says it's 
building the
index, not compacting the corresponding CF. Either that's an ambiguous 
diagnostic,
or indeed something is not right with my rig as of late.

Maxim



On 4/17/2012 10:05 AM, Jake Luciani wrote:
> Well, the since the secondary indexes are themselves 
> column families they too are compacted along with everything else.
>
> On Tue, Apr 17, 2012 at 10:02 AM, Maxim Potekhin <potekhin@bnl.gov 
> <mailto:potekhin@bnl.gov>> wrote:
>
>     Thanks Jake. Then I am definitely seeing weirdness, as there are
>     tons of
>     "pending tasks" in compaction stats, and tons of index files
>     created in the
>     data directory. Plus it does tell me that it is building the
>     secondary index,
>     and that seems to be happening at an amazingly glacial pace.
>
>     I have 2 CFs there, with multiple secondary indexes. I'll try
>     to compact the CF one by one, reboot and see if that helps.
>
>     Maxim
>
>
>
>     On 4/17/2012 9:53 AM, Jake Luciani wrote:
>>     No, the indexes are not rebuilt every compaction.  Only if you
>>     manually rebuild or bootstrap a new node does it use compaction
>>     manager to rebuild.
>>
>>     On Tue, Apr 17, 2012 at 9:47 AM, Maxim Potekhin <potekhin@bnl.gov
>>     <mailto:potekhin@bnl.gov>> wrote:
>>
>>         Thanks Aaaron. Just to be clear, every time I do a compaction,
>>         I rebuild all indexes from scratch. Right?
>>
>>         Maxim
>>
>>
>>
>>         On 4/17/2012 6:16 AM, aaron morton wrote:
>>>         Yes secondary index builds are done via the compaction manager.
>>>
>>>         Cheers
>>>
>>>         -----------------
>>>         Aaron Morton
>>>         Freelance Developer
>>>         @aaronmorton
>>>         http://www.thelastpickle.com
>>>
>>>         On 17/04/2012, at 1:06 PM, Maxim Potekhin wrote:
>>>
>>>>         I noticed that "nodetool compactionstats" shows the
>>>>         building of the secondary index while
>>>>         I initiate compaction. Is this to be expected? Cassandra
>>>>         version 0.8.8.
>>>>
>>>>         Thank you
>>>>
>>>>         Maxim
>>>>
>>>
>>
>>
>>
>>
>>     -- 
>>     http://twitter.com/tjake
>
>
>
>
> -- 
> http://twitter.com/tjake


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