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https://issues.apache.org/jira/browse/CASSANDRA-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472479#comment-13472479
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Brandon Williams commented on CASSANDRA-4781:
---------------------------------------------
Here is something possibly related that is easy to reproduce. Given nodes X, Y
and Z, start X. Now start Y, and see X flush schema_columns and
schema_keyspaces in addition to peers/local, even though there's no schema and
nothing changed. Now start Z and see both X and Y exhibit this behavior, and
sometimes even flush the schema twice in a row.
> 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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