See https://issues.apache.org/jira/browse/CASSANDRA-3741 I did post a fix there that helped me.
2012/4/24 crypto five <[email protected]> > Hi, > > I have 50 millions of rows in column family on 4G RAM box. I allocatedf > 2GB to cassandra. > I have program which is traversing this CF and cleaning some data there, > it generates about 20k delete statements per second. > After about of 3 millions deletions cassandra stops responding to queries: > it doesn't react to CLI, nodetool etc. > I see in the logs that it tries to free some memory but can't even if I > wait whole day. > Also I see following in the logs: > > INFO [ScheduledTasks:1] 2012-04-23 18:38:13,333 StorageService.java (line > 2647) Unable to reduce heap usage since there are no dirty column families > > When I am looking at memory dump I see that memory goes to > ConcurrentSkipListMap(10%), HeapByteBuffer(13%), DecoratedKey(6%), > int[](6%), BigInteger(8.2%), ConcurrentSkipListMap$HeadIndex(7.2%), > ColumnFamily(6.5%), ThreadSafeSortedColumns(13.7%), long[](5.9%). > > What can I do to make cassandra stop dying? > Why it can't free the memory? > Any ideas? > > Thank you. > -- Best regards, Vitalii Tymchyshyn
