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From Otis Gospodnetic <otis.gospodne...@gmail.com>
Subject Re: Is this a long GC pause, or something else?
Date Tue, 10 Jun 2014 21:43:04 GMT
Does it repeat?
We are seeing this with u60 oracle JVM too!  SPM shows the whole JVM blocking for about 16
minutes every M minutes. 



> On Jun 10, 2014, at 2:05 PM, Tom Brown <tombrown52@gmail.com> wrote:
> Last night a regionserver in my cluster stopped responding in a timely
> manner for about 20 minutes. I know that stop-the-world GC can cause this
> type of behavior, but 20 minutes seems excessive.
> The server is a 2 core VM with 16GB of RAM, (hbase max heap is 12GB). We
> are using the latest java 7 from oracle. HDFS is provided by an Isilon
> cluster.
> The server workload is read/write: the writing process reads all rows it is
> about to write, updates them if they exist, and then writes all the rows
> (replacing ones that were updated).
> The last messages before the pause were regarding an HLog roll:
> DEBUG org.apache.hadoop.hbase.regionserver.LogRoller: HLog roll requested
> INFO org.apache.hadoop.hbase.util.FSUtils: FileSystem doesn't support
> getDefaultReplication
> INFO org.apache.hadoop.hbase.util.FSUtils: FileSystem doesn't support
> getDefaultBlockSize
> During the next 20 minutes there were a handful of sporadic LruBlockCache
> stats messages but nothing else. After 20 minutes, normal operation resumed.
> Is 20 minutes for a GC pause expected given the operational load and
> machine specs? Could a GC pause include periodic log messages? If it wasn't
> a GC pause, what else could it be?
> --Tom

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