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From Chris Lohfink <clohf...@blackbirdit.com>
Subject Re: MemtablePostFlusher and FlushWriter
Date Tue, 15 Jul 2014 23:49:49 GMT
The MemtablePostFlusher is also used for flushing non-cf backed (solr) indexes.  Are you using
DSE and solr by chance?

Chris

On Jul 15, 2014, at 5:01 PM, horschi <horschi@gmail.com> wrote:

> I have seen this behavour when Commitlog files got deleted (or permissions were set to
read only).
> 
> MemtablePostFlusher is the stage that marks the Commitlog as flushed. When they fail
it usually means there is something wrong with the commitlog files.
> 
> Check your logfiles for any commitlog related errors.
> 
> regards,
> Christian
> 
> 
> On Tue, Jul 15, 2014 at 7:03 PM, Kais Ahmed <kais@neteck-fr.com> wrote:
> Hi all,
> 
> I have a small cluster (2 nodes RF 2)  running with C* 2.0.6 on I2 Extra Large (AWS)
with SSD disk,
> the nodetool tpstats shows many MemtablePostFlusher pending and FlushWriter All time
blocked.
> 
> The two nodes have the default configuration. All CF use size-tiered compaction strategy.
> 
> There are 10 times more reads than writes (1300 reads/s and 150 writes/s).
> 
> 
> ubuntu@node1 :~$ nodetool tpstats
> Pool Name                    Active   Pending      Completed   Blocked  All time blocked
> MemtablePostFlusher               1      1158         159590         0              
  0
> FlushWriter                       0         0          11568         0              1031
> 
> ubuntu@node1:~$ nodetool compactionstats
> pending tasks: 90
> Active compaction remaining time :        n/a
> 
> 
> ubuntu@node2:~$ nodetool tpstats
> Pool Name                    Active   Pending      Completed   Blocked  All time blocked
> MemtablePostFlusher               1      1020          50987         0              
  0
> FlushWriter                       0         0           6672         0              
948
> 
> 
> ubuntu@node2:~$ nodetool compactionstats
> pending tasks: 89
> Active compaction remaining time :        n/a
> 
> I think there is something wrong, thank you for your help.
> 
> 


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