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From karthi keyan <karthi93.san...@gmail.com>
Subject Re: Region server crashes after GC pause time
Date Fri, 22 Apr 2016 12:04:14 GMT
Hi Ding,

I have increased the Heap to 2G , still getting out of memory exception .
Actually i had write the data to HBase at 40K writes/sec .
 Is there any parameter to tune up , as my knowledge "-
XX:CMSInitiatingOccupancyFraction=N " i tuned like this in HBase.
Is there any other parameter required to resolve this issue???

Best,
Karthik

On Thu, Apr 14, 2016 at 12:21 PM, Ding,Dongchao <dingdongchao@baidu.com>
wrote:

> Dump the jvm heap,analysis the the heap and find which query(s) cost so
> many memory?
> In my ever bad case,the RS crashed for Long GC pauses because of a big
> query on Batch Get operation.
>
>
> In addition,I think you can increase the men of JVM, 512m is so small for
> RS.
>
>
>
> 在 16/4/14 14:00, "karthi keyan" <karthi93.sankar@gmail.com> 写入:
>
> >Hi ,
> >
> >i got this issue in HBase while at peak time handling more requests . can
> >any one pls guide me to resolve the Long GC pauses in hbase .
> >
> >JDK-7 , JVM heap 512m
> >
> >HBase 0.98.13
> >
> >
> > INFO  [JvmPauseMonitor] util.JvmPauseMonitor: Detected pause in JVM or
> >host machine (eg GC): pause of approximately 1466ms
> >GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=1967ms
> > INFO  [JvmPauseMonitor] util.JvmPauseMonitor: Detected pause in JVM or
> >host machine (eg GC): pause of approximately 2304ms
> >GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=2775ms
> > INFO  [JvmPauseMonitor] util.JvmPauseMonitor: Detected pause in JVM or
> >host machine (eg GC): pause of approximately 2287ms
> >GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=2775ms
> >
> > INFO  [RS:0;0:0:0:0:0:0:0:0:44037-SendThread(<host>:2181)]
> >zookeeper.ClientCnxn: Client session timed out, have not heard from server
> >in 6819ms for sessionid 0x1540ab48b280004, closing socket connection and
> >attempting reconnect
> > INFO  [SplitLogWorker-<host>,44037,1460468489645-SendThread(<host>:2181)]
> >zookeeper.ClientCnxn: Client session timed out, have not heard from server
> >in 6819ms for sessionid 0x1540ab48b280005, closing socket connection and
> >attempting reconnect
> >
> >Once after this HBase Region Server moved to Dead state.
> >
> >Best,
> >Karthik
>
>

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