[jira] [Resolved] (CASSANDRA-5204) The first three Cassandra node is very busy , GC pause the world (Real production Env. Exp.)

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-5204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis resolved CASSANDRA-5204.
---------------------------------------

    Resolution: Invalid

Please take tuning/troubleshooting reports to the users list.
                
> The first three Cassandra node is very busy , GC pause the world (Real production Env. Exp.)
> --------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5204
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5204
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.1.5
>         Environment: cassandra 1.1.5 release
> centos 5.5  
> jdk1.7u9 
> vmware(TM)'s exsi based VM : 30GB RAM , 4*4core CPU 
> Hard ware : Dell R720 , 2*6core CPU , 128GB RAM , made 3 node as above
> data hosted by each node : about 8GB
>            Reporter: sunjian
>            Priority: Minor
>             Fix For: 1.0.10
>
>
> hi dear cares , 
> I have 10 nodes before , all on the centos VM with 16GB ram and 8core CPU , and running the cassandra 1.1.5 with only one User keyspace (RF=3) . Heap(Old:8GB,New:2GB)
> matters :
> 1. the first three nodes (from token 0) goes very busy all the time , but the left 7 nodes seems nothing to do , both the CPU and RAM was freely .
> 2. all of the first three nodes' JVM ram cost increasing crazy , CMS GC fires nearly every seconds
> 3. when GC happened , the world seems stopped . checking via node tool , when running node tool on the first three node , nodetool will hung up . when running on the left 7 nodes , it shows that the first three node down
> 4. when GC finished , the node comes back , but it will gone in mins later .
> 5. kill java process , reboot the frozen node , it will up in mins , and the JVM ram will be increasing full in mins as well , and everythings above repeating ....
> 6. even if only one of the first three node frozen , the client request will failed . but my client request CL=QUORUM , and I am playing with hector client lib.
> 7. disable the three nodes' thrift api , nothing changed.
> ----------change------------
> 0. stop the coming user request (stop our user service to make cassandra free)
> 1. decommission 4 nodes (one by one)
> 2. moving tokens to banlance the left 6 nodes (one by one) 
> 3. change the left 6 node resource to : 30GB RAM 16core CPU , heap(16G old , 4GB new)
> 4. enable JNA
> 5. do major compaction on the 6nodes , do repair on the 6nodes
> 6. start the new cluster ...
> 7. everything seems ok in the early running time , but 5hours past , every bad matters come back .
> 8. because of we have got double RAM now , the dead repeating cycle goes hourly
> some screen short attached .

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