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From Pranay akula <pranay.akula2...@gmail.com>
Subject Re: what is MemtableReclaimMemory mean ??
Date Tue, 02 May 2017 02:01:20 GMT
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 <arodrime@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 - alain@thelastpickle.com
> France
>
> The Last Pickle - Apache Cassandra Consulting
> http://www.thelastpickle.com
>
>
>
> 2017-04-16 16:04 GMT+02:00 Pranay akula <pranay.akula2323@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.
>>
>
>

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