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From Віталій Тимчишин <tiv...@gmail.com>
Subject Re: Cassandra dying when gets many deletes
Date Tue, 24 Apr 2012 05:37:42 GMT
See https://issues.apache.org/jira/browse/CASSANDRA-3741
I did post a fix there that helped me.

2012/4/24 crypto five <cryptofive@gmail.com>

> 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

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