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From Roberto Bentivoglio <roberto.bentivog...@gmail.com>
Subject Re: Problem about freeing space after a major compaction
Date Mon, 28 Mar 2011 15:15:16 GMT
Thanks you again, we're going to update our enviroment.

Regards,
Roberto

On 28 March 2011 17:08, Ching-Cheng Chen <cchen@evidentsoftware.com> wrote:

>
> AFAIK, setting gc_grace_period to 0 shouldn't cause this issue.   In fact,
> that what I'm using now in a single node environment like yours.
>
> However, I'm using 0.7.2 with some patches.   If you are still using 0.7.0,
> most likely you got hit with this bug.
> You might want to patch it or upgrade to latest release.
>
> https://issues.apache.org/jira/browse/CASSANDRA-2059
>
> Regards,
>
> <https://issues.apache.org/jira/browse/CASSANDRA-2059>
>
> Chen
>
> Senior Developer, EvidentSoftware(Leaders in Monitoring of NoSQL & JAVA )
>
> http://www.evidentsoftware.com
>
> On Mon, Mar 28, 2011 at 11:04 AM, Roberto Bentivoglio <
> roberto.bentivoglio@gmail.com> wrote:
>
>> Hi Chen,
>> we've set the gc grace period of the column families to 0 as suggest in a
>> single node enviroment.
>> Can this setting cause the problem? I don't think so...
>>
>> Thanks,
>> Roberto
>>
>> On 28 March 2011 16:54, Ching-Cheng Chen <cchen@evidentsoftware.com>wrote:
>>
>>> tombstones removal also depends on your gc grace period setting.
>>>
>>> If you are pretty sure that you have proper gc grace period set and still
>>> on 0.7.0, then probably related to this bug.
>>>
>>> https://issues.apache.org/jira/browse/CASSANDRA-2059
>>>
>>> Regards,
>>>
>>> <https://issues.apache.org/jira/browse/CASSANDRA-2059>
>>>
>>> Chen
>>>
>>> Senior Developer, EvidentSoftware(Leaders in Monitoring of NoSQL & JAVA )
>>>
>>> http://www.evidentsoftware.com
>>>
>>> On Mon, Mar 28, 2011 at 10:40 AM, Roberto Bentivoglio <
>>> roberto.bentivoglio@gmail.com> wrote:
>>>
>>>> Hi all,
>>>> we're working on a Cassandra 0.7.0 production enviroment with a store of
>>>> data near to 500 GB.
>>>> We need to periodically remove the tombstones from deleted/expired data
>>>> performing a major compaction operation through nodetool.
>>>> After invoking the compaction on a single column family we can see from
>>>> JConsole that the LiveSSTableCount is going from 15 to 3 while the
>>>> LiveDiskSpaceUsed is going from 90GB to 50GB.
>>>> The problem now is that the space on the file system is been taken from
>>>> Cassandra (I assumed from the old SSTable) and it isn't freed. We have tried
>>>> to perform a full GC from the JConsole as described in
>>>> http://wiki.apache.org/cassandra/MemtableSSTable without any success.
>>>> The space is freed only after a database restart.
>>>>
>>>> How can we free this disk space without restart the db?
>>>>
>>>> Thanks you very much,
>>>> Roberto Bentivoglio
>>>>
>>>
>>>
>>
>

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