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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4781) Sometimes Cassandra starts compacting system-shema_columns cf repeatedly until the node is killed
Date Tue, 30 Oct 2012 19:28:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487149#comment-13487149
] 

Brandon Williams commented on CASSANDRA-4781:
---------------------------------------------

[~minaguib] your issue is slightly different; there is constant flushing of the schema too.
                
> Sometimes Cassandra starts compacting system-shema_columns cf repeatedly until the node
is killed
> -------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4781
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4781
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.2.0 beta 1
>         Environment: Ubuntu 12.04, single-node Cassandra cluster
>            Reporter: Aleksey Yeschenko
>            Assignee: Yuki Morishita
>             Fix For: 1.2.0 beta 2
>
>         Attachments: 4781.txt, 4781-v2.txt, 4781-v3.txt
>
>
> Cassandra starts flushing system-schema_columns cf in a seemingly infinite loop:
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,804 CompactionTask.java (line 239) Compacted
to [/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32107-Data.db,].
 3,827 to 3,827 (~100% of original) bytes for 3 keys at 0.202762MB/s.  Time: 18ms.
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,804 CompactionTask.java (line 119) Compacting
[SSTableReader(path='/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32107-Data.db')]
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,824 CompactionTask.java (line 239) Compacted
to [/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32108-Data.db,].
 3,827 to 3,827 (~100% of original) bytes for 3 keys at 0.182486MB/s.  Time: 20ms.
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,825 CompactionTask.java (line 119) Compacting
[SSTableReader(path='/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32108-Data.db')]
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,864 CompactionTask.java (line 239) Compacted
to [/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32109-Data.db,].
 3,827 to 3,827 (~100% of original) bytes for 3 keys at 0.096045MB/s.  Time: 38ms.
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,864 CompactionTask.java (line 119) Compacting
[SSTableReader(path='/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32109-Data.db')]
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,894 CompactionTask.java (line 239) Compacted
to [/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32110-Data.db,].
 3,827 to 3,827 (~100% of original) bytes for 3 keys at 0.121657MB/s.  Time: 30ms.
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,894 CompactionTask.java (line 119) Compacting
[SSTableReader(path='/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32110-Data.db')]
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,914 CompactionTask.java (line 239) Compacted
to [/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32111-Data.db,].
 3,827 to 3,827 (~100% of original) bytes for 3 keys at 0.202762MB/s.  Time: 18ms.
>  INFO [CompactionExecutor:7] 2012-10-09 17:55:46,914 CompactionTask.java (line 119) Compacting
[SSTableReader(path='/var/lib/cassandra/data/system/schema_columns/system-schema_columns-ia-32111-Data.db')]
> .........
> Don't know what's causing it. Don't know a way to predictably trigger this behaviour.
It just happens sometimes.

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