Hi Alain, when "*MemtableReclaimMemory*" Pending Tasks increasing, its slowly backing up reads and writes mostly writes. yes i am seeing bit high GC pressure, currently we are using 24Gb Heap and G1GC collection. I tried changing Memtable flush threshold it did helped a little but not much. I am not seeing any Errors in the Logs.
Thanks Pranay. On Thu, Apr 27, 2017 at 6:08 AM, Alain RODRIGUEZ <arodr...@gmail.com> wrote: > Hi Pranay, > > According to http://docs.datastax.com/en/cassandra/3.0/cassandra/tools/ > toolsTPstats.html, "*MemtableReclaimMemory*" is the thread pool used for > "Making unused memory available". I don't know much about it since it was > never an issue for me. Neither did I heard much about it. > > > - Are pending tasks staying high for a long period? `watch -d nodetool > tpstats` > - What are your GC settings? > - Any other threads pending, blocked or dropped? > - Do you have errors or warnings in your logs? > - Any GC pressure? (monitored through charts or logs at INFO level, or > WARN on recent versions) > > > C*heers, > ----------------------- > Alain Rodriguez - @arodream - al...@thelastpickle.com > France > > The Last Pickle - Apache Cassandra Consulting > http://www.thelastpickle.com > > > > 2017-04-16 16:04 GMT+02:00 Pranay akula <pranay.akula2...@gmail.com>: > >> Hi, >> >> what is *MemtableReclaimMemory* mean in nodetooltpstats ?? does this >> mean trying to flushing memtable from memory to SStables. >> >> I can see sometimes increase in pending tasks of MemtableReclaimMemory >> in nodetool tpstats, at that time i can see increase in load on those nodes. >> >> Does decreasing memtable_cleanup_threshold will help ?? >> >> Thanks >> Pranay. >> > >
