Aleksey Yeschenko created CASSANDRA-4781:
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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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