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From "Cedric Ho" <cedric...@gmail.com>
Subject HBase UnknownScannerException
Date Fri, 26 Oct 2007 02:57:49 GMT

I was trying HBase from the 0.15 branch. And was doing:

HScannerInterface s = table.obtainScanner(...)
while(s.next(key, val)) {

And encounter the following exception whenever I spent too much time
in the while loop, (e.g. > 30 ~ 120 seconds). I am also doing insert
in the same table in another process. But the records they are working
on are definitely non-overlapping.

org.apache.hadoop.hbase.UnknownScannerException: Name:
        at org.apache.hadoop.hbase.HRegionServer.next(HRegionServer.java:1075)
        at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:379)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)

        at org.apache.hadoop.ipc.Client.call(Client.java:482)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:184)
        at $Proxy1.next(Unknown Source)
        at org.apache.hadoop.hbase.HTable$ClientScanner.next(HTable.java:831)

there are totally 6 machines:
one running namenode, secondarynamenode, hbase master
five running datanode, regionserver


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