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Posted to user@cassandra.apache.org by Dimetrio <di...@flysoft.ru> on 2014/05/16 16:11:31 UTC
Tombstones
Does cassandra delete tombstones during simple LCS compaction or I should use
node tool repair?
Thanks.
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RE: Tombstones
Posted by Dimetrio <di...@flysoft.ru>.
oh,
its for for cassandra 1.x, right?
I use 2.0.7.
How could I reset leveled manifest in this case?
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RE: Tombstones
Posted by "Plotnik, Alexey" <ap...@rhonda.ru>.
It's located beside SSTables and has a name in format <CF>.json
For `accounts` column family in `company` keyspace it looks like <CASSANDRA_DATA_DIR>/company/accounts/accounts.json
-----Original Message-----
From: Dimetrio [mailto:dimetrio@flysoft.ru]
Sent: 18 мая 2014 г. 2:06
To: cassandra-user@incubator.apache.org
Subject: Re: Tombstones
Thanks!
How could I find leveled json manifest?
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Re: Tombstones
Posted by Dimetrio <di...@flysoft.ru>.
Thanks!
How could I find leveled json manifest?
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Re: Tombstones
Posted by Arya Goudarzi <go...@gmail.com>.
Nodetool cleanup deletes rows that aren't owned by specific tokens
(shouldn't be on this node). And nodetool repair makes sure data is in sync
between all replicas. It is wrong to say either of these commands cleanup
tombstones. Tombstones are only cleaned up during compactions only if they
are expired passed gc_grace_seconds. Now it is also incorrect to say that
compaction always cleans up tombstones. In fact there are situations that
can lead to tombstones live for a long time. SSTables are immutable, so if
the SSTables that hold tombstones aren't part of a compaction the
tombstones don't get cleaned up, so the behavior you are expecting is not
100% predictable. In case of LCS, if SStables are promoted to another
level, compaction happens and tombstones which are expired will cleanup.
Unlike SizeTiered in LCS there is no easy way to force compaction on
SSTables. One hack I have tried in the past was to stop the node and
deleted the .json file that holds level manifests. Start the node. LCS will
compact all of them again to figure out the levels. Another way is if you
pick smaller SSTable sizes, you may have more compaction churn but again it
is not 100% guarantee that the tombstones you want will be cleaned up.
On Fri, May 16, 2014 at 9:06 AM, Omar Shibli <om...@eyeviewdigital.com>wrote:
> Yes, but still you need to run 'nodetool cleanup' from time to time to
> make sure all tombstones are deleted.
>
>
> On Fri, May 16, 2014 at 10:11 AM, Dimetrio <di...@flysoft.ru> wrote:
>
>> Does cassandra delete tombstones during simple LCS compaction or I should
>> use
>> node tool repair?
>>
>> Thanks.
>>
>>
>>
>> --
>> View this message in context:
>> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Tombstones-tp7594467.html
>> Sent from the cassandra-user@incubator.apache.org mailing list archive
>> at Nabble.com.
>>
>
>
--
Cheers,
-Arya
Re: Tombstones
Posted by Omar Shibli <om...@eyeviewdigital.com>.
Yes, but still you need to run 'nodetool cleanup' from time to time to make
sure all tombstones are deleted.
On Fri, May 16, 2014 at 10:11 AM, Dimetrio <di...@flysoft.ru> wrote:
> Does cassandra delete tombstones during simple LCS compaction or I should
> use
> node tool repair?
>
> Thanks.
>
>
>
> --
> View this message in context:
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Tombstones-tp7594467.html
> Sent from the cassandra-user@incubator.apache.org mailing list archive at
> Nabble.com.
>
Re: Tombstones
Posted by Chris Lohfink <cl...@blackbirdit.com>.
It will delete them after gc_grace_seconds (set per table) and a compaction.
---
Chris Lohfink
On May 16, 2014, at 9:11 AM, Dimetrio <di...@flysoft.ru> wrote:
> Does cassandra delete tombstones during simple LCS compaction or I should use
> node tool repair?
>
> Thanks.
>
>
>
> --
> View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Tombstones-tp7594467.html
> Sent from the cassandra-user@incubator.apache.org mailing list archive at Nabble.com.
RE: Tombstones
Posted by Andreas Finke <An...@solvians.com>.
Hi Dimetrio,
>From the wiki:
Since 0.6.8, minor compactions also GC tombstones
Regards
Andi
---- Dimetrio wrote ----
Does cassandra delete tombstones during simple LCS compaction or I should use
node tool repair?
Thanks.
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