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Date: Wed, 19 Jun 2013 11:36:38 -0700 (PDT)
From: Wei Zhu <wz1975@yahoo.com>
Reply-To: Wei Zhu <wz1975@yahoo.com>
Subject: Re: Heap is not released and streaming hangs at 0%
To: user@cassandra.apache.org
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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 

-Wei 

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

From: "Robert Coli" <rcoli@eventbrite.com> 
To: user@cassandra.apache.org 
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 <comomore@gmail.com> 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. 

=Rob 


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<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000'>If you want, you can try to force the GC through Jconsole. Memory-&gt;Perform GC.<br><br>It theoretically triggers a full GC and when it will happen depends on the JVM<br><br>-Wei<br><br><hr id="zwchr"><div style="color: rgb(0, 0, 0); font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Robert Coli" &lt;rcoli@eventbrite.com&gt;<br><b>To: </b>user@cassandra.apache.org<br><b>Sent: </b>Tuesday, June 18, 2013 10:43:13 AM<br><b>Subject: </b>Re: Heap is not released and streaming hangs at 0%<br><br>On Tue, Jun 18, 2013 at 10:33 AM, srmore &lt;comomore@gmail.com&gt; wrote:<br>&gt; But then shouldn't JVM C G it eventually ? I can still see Cassandra alive<br>&gt; and kicking but looks like the heap is locked up even after
 the traffic is<br>&gt; long stopped.<br><br>No, when GC system fails this hard it is often a permanent failure<br>which requires a restart of the JVM.<br><br>&gt; nodetool -h localhost flush didn't do much good.<br><br>This adds support to the idea that your heap is too full, and not full<br>of memtables.<br><br>You could try nodetool -h localhost invalidatekeycache, but that<br>probably will not free enough memory to help you.<br><br>=Rob<br></div><br></div></body></html>
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