Hi, Are u trying to do parallel scans. If yes, check the time taken for GC and the number of calls that can be served at your end point.
Best Regards N.Hari Kumar On Tue, Sep 11, 2012 at 8:22 AM, Dhirendra Singh <[email protected]> wrote: > i tried with a smaller caching i.e 10, it failed again, not its not really > a big cell. this small cluster(4 nodes) is only used for Hbase, i am > currently using hbase-0.92.1-cdh4.0.1. , could you just let me know how > could i debug this issue ? > > > aused by: org.apache.hadoop.hbase.client.ScannerTimeoutException: > 99560ms passed since the last invocation, timeout is currently set to > 60000 > at > org.apache.hadoop.hbase.client.HTable$ClientScanner.next(HTable.java:1302) > at > org.apache.hadoop.hbase.client.HTable$ClientScanner$1.hasNext(HTable.java:1399) > ... 5 more > Caused by: org.apache.hadoop.hbase.UnknownScannerException: > org.apache.hadoop.hbase.UnknownScannerException: Name: > -8889369042827960647 > at > org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:2114) > at sun.reflect.GeneratedMethodAccessor38.invoke(Unknown Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at > org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:364) > at > org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1336) > > > > On Mon, Sep 10, 2012 at 10:53 PM, Stack <[email protected]> wrote: > > > On Mon, Sep 10, 2012 at 10:13 AM, Dhirendra Singh <[email protected]> > > wrote: > > > I am facing this exception while iterating over a big table, by > default > > i > > > have specified caching as 100, > > > > > > i am getting the below exception, even though i checked there are > several > > > calls made to the scanner before it threw this exception, but somehow > its > > > saying 86095ms were passed since last invocation. > > > > > > i also observed that if it set scan.setCaching(false), it succeeds, > > could > > > some one please explain or point me to some document as if what's > > happening > > > here and what's the best practices to avoid it. > > > > > > > > > > Try again cachine < 100. See if it works. A big cell? A GC pause? > > You should be able to tell roughly which server is being traversed > > when you get the timeout. Anything else going on on that server at > > the time? What version of HBase? > > St.Ack > > > > > > -- > Warm Regards, > Dhirendra Pratap > +91. 9717394713 > -- FROM HARI KUMAR.N
