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From "Radim Kolar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4690) Delete only workload OOM cassandra
Date Wed, 19 Sep 2012 16:29:08 GMT
Radim Kolar created CASSANDRA-4690:
--------------------------------------

             Summary: Delete only workload OOM cassandra
                 Key: CASSANDRA-4690
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4690
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.11
         Environment: OpenJDK 6
            Reporter: Radim Kolar
            Priority: Blocker


Restart cassandra node and run delete only workload against CF. No other update operations
like insert or delete are used against that CF.

Cassandra do not counts deletes in serialized/live bytes. It counts them just as ops. After
some time cassandra will run almost out of Java heap space and tries to do emergency flush,
which will not be done at CF with deletes because cassandra thinks that it has 0 live bytes.
This will result in OOM after while, but usually cassandra just hangs.

To make this workload finish, you have to issue periodic nodetool flush commands. Their flueshes
on that CF looks:

 INFO [RMI TCP Connection(69)-64.6.108.239] 2012-09-19 18:22:46,366 ColumnFamilyStore.java
(line 705) Enqueuing flush of Memtable-sipdb@359811109(0/0 serialized/live bytes, 688056 ops)
 INFO [FlushWriter:13] 2012-09-19 18:22:46,366 Memtable.java (line 246) Writing Memtable-sipdb@359811109(0/0
serialized/live bytes, 688056 ops)
 INFO [FlushWriter:13] 2012-09-19 18:22:49,719 Memtable.java (line 283) Completed flushing
/var/lib/cassandra/data/test/sipdb-hd-4726-Data.db (37155024 bytes)


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