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From Wei Zhu <>
Subject Re: Heap is not released and streaming hangs at 0%
Date Wed, 19 Jun 2013 18:36:38 GMT
If you want, you can try to force the GC through Jconsole. Memory->Perform GC. 

It theoretically triggers a full GC and when it will happen depends on the JVM 


----- Original Message -----

From: "Robert Coli" <> 
Sent: Tuesday, June 18, 2013 10:43:13 AM 
Subject: Re: Heap is not released and streaming hangs at 0% 

On Tue, Jun 18, 2013 at 10:33 AM, srmore <> wrote: 
> But then shouldn't JVM C G it eventually ? I can still see Cassandra alive 
> and kicking but looks like the heap is locked up even after the traffic is 
> long stopped. 

No, when GC system fails this hard it is often a permanent failure 
which requires a restart of the JVM. 

> nodetool -h localhost flush didn't do much good. 

This adds support to the idea that your heap is too full, and not full 
of memtables. 

You could try nodetool -h localhost invalidatekeycache, but that 
probably will not free enough memory to help you. 


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