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From aaron morton <aa...@thelastpickle.com>
Subject Re: SSTable compaction issue in our system
Date Wed, 01 Feb 2012 00:14:45 GMT
There is no way to reverse a compaction. 

You can initiate a user compaction on a single file though, see nodetool (i think) or the
JMX interface. 
Cheers

-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 1/02/2012, at 4:10 AM, Micah Hausler wrote:

> A related question, is there any way to reverse a major compaction without loosing performance?
Do I just have to wait it out?
> 
> Micah Hausler
> 
> On Jan 30, 2012, at 7:50 PM, Roshan Pradeep wrote:
> 
>> Thanks Aaron for the perfect explanation. Decided to go with automatic compaction.
Thanks again.
>> 
>> On Wed, Jan 25, 2012 at 11:19 AM, aaron morton <aaron@thelastpickle.com> wrote:
>> The issue with major / manual compaction is that it creates a one file. One big old
file.  
>> 
>> That one file will not be compacted unless there are (min_compaction_threshold -1)
other files of a similar size. So thombstones and overwrites in that file may not be purged
for a long time. 
>> 
>> If you go down the manual compaction path you need to keep doing it.
>> 
>> If you feel you need to do it do it, otherwise let automatic compaction do it's thing.

>> Cheers
>>   
>>   
>> -----------------
>> Aaron Morton
>> Freelance Developer
>> @aaronmorton
>> http://www.thelastpickle.com
>> 
>> On 25/01/2012, at 12:47 PM, Roshan wrote:
>> 
>>> Thanks for the reply. Is the major compaction not recommended for Cassandra
>>> 1.0.6?
>>> 
>>> --
>>> View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Different-size-of-SSTable-are-remain-in-the-system-without-compact-tp7218239p7222322.html
>>> Sent from the cassandra-user@incubator.apache.org mailing list archive at Nabble.com.
>> 
>> 
> 


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