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From Naresh Yadav <nyadav....@gmail.com>
Subject Cassandra HANGS after some writes
Date Tue, 13 Aug 2013 09:22:55 GMT
Hi All,

I have single node cassandra using  CQL using datastax java driver 1.0.1
and cassandra verison 1.2.6.

*Infrastructure :* 16GB machine with 8GB heap given to cassandra, i7
processor.. DEFAULT cassandra.yaml no change done by me.
-Xms1G^
 -Xmx12G^         no other change in cassandra.bat

*Problem :
_________
 *cassandra Freezes after some writes and i see no action on cassandra
console for an hour...all Native_Transport threads are also killed....my
program keeps running NO ERROR comes.......when i connect with cql that
works........ In start it creates 16 NativeTransport threads and after
10-15 minutes Total threads goes to 128...Just before it hangs, With
JCONSOLE when i see Native_Transport threads then i find most of them in
state as :

http://pastebin.com/DeShpHtP

*Load on cassandra : *
___________________
i am running a usecase which stores Combinations(my project terminology) in
cassandra....Currently testing storing 2.5 lakh combinations with 100
parallel threads..each thread storing one combination...real case i need to
support of many CRORES but that would need different hardware and multi
node cluster...

In Storing ONE combination takes around 2sec and involves :

527 INSERT INTO queries ....

506 UPDATE queries ....

954 SELECT queries ....

100 parallel threads parallely storing 100 combinations....
*MY CASSANDRA LOGS :*

http://pastebin.com/CnNvA9x3

Please look last 100-200 lines of log because that is time it freezed


PLEASE HELP ME OUT, I AM NOT ABLE TO PROCEED FROM 1 week...

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