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 <hors...@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 <k...@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. > >
