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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4781) Sometimes Cassandra starts flushing system-shema_columns cf repeatedly until the node is killed
Date Tue, 09 Oct 2012 15:40:03 GMT
Aleksey Yeschenko created CASSANDRA-4781:
--------------------------------------------

             Summary: Sometimes Cassandra starts flushing 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


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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