Re: RE: how to fix constantly getting out of memory (3.11)

[Jay Zhuang <ja...@yahoo.com.INVALID>]

 Hi,
For CASSANDRA-13929, The patch is available for review. Anyone interested in reviewing it?
Thanks,Jay
    On Tuesday, December 12, 2017, 5:02:14 AM PST, Steinmaurer, Thomas <th...@dynatrace.com> wrote:  
 
 Hi,

if you are talking about on-heap troubles, then the following might be related in 3.11.x:
https://issues.apache.org/jira/browse/CASSANDRA-13929

Thomas

-----Original Message-----
From: Micha [mailto:micha-1@fantasymail.de]
Sent: Dienstag, 12. Dezember 2017 09:24
To: dev@cassandra.apache.org
Subject: how to fix constantly getting out of memory (3.11)

Hi,

I have seven nodes, debian stretch with c*3.11, each with 2TB disk (500G free), 32G Ram.
I have a keyspace with seven tables. At the moment the cluster doesn't work at all reliably. Every morning at least 2 nodes are shut down due to out of memory. Repair afterwards fails with "some repair failed".
I use G1 with 16G heap on 6 six nodes and cms with 8G heap on one node to see a difference. In munin it's easy to see a constantly rising memory consumption. There are no other services running. I cannot understand who is not releasing the memory.
Some tables have some big rows (as mentioned in my last mail to the list). Can this be a source of the memory consumption?

How do you track down this?  Is there memory which doesn't get released and accumulates over time? I have not yet debugged such gc/memory issues.

cheers
 Michael


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