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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1163) Master root scanner hung, clients blocked indefinitely waiting for getStartKeys()
Date Fri, 30 Jan 2009 01:52:59 GMT
Master root scanner hung, clients blocked indefinitely waiting for getStartKeys()
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                 Key: HBASE-1163
                 URL: https://issues.apache.org/jira/browse/HBASE-1163
             Project: Hadoop HBase
          Issue Type: Bug
    Affects Versions: 0.19.0
            Reporter: Andrew Purtell
            Priority: Critical


Mapreduce tasks based on TIF won't start. Clients trying to find regions by start key block
indefinitely (Heritrix hbase writer eventually times out archiver). 

Master seems hung in root scan. I've dumped thread stacks 10 times in 10 minutes and the same
HBaseClient$Call  object appears in the trace. See below:

Thread 21 (RegionManager.rootScanner):
  State: WAITING
  Blocked count: 500
  Waited count: 621
  Waiting on org.apache.hadoop.hbase.ipc.HBaseClient$Call@55a2896d
  Stack:
    java.lang.Object.wait(Native Method)
    java.lang.Object.wait(Object.java:485)
    org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:695)
    org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:321)
    $Proxy2.next(Unknown Source)
    org.apache.hadoop.hbase.master.BaseScanner.scanRegion(BaseScanner.java:161)
    org.apache.hadoop.hbase.master.RootScanner.scanRoot(RootScanner.java:55)
    org.apache.hadoop.hbase.master.RootScanner.maintenanceScan(RootScanner.java:80)
    org.apache.hadoop.hbase.master.BaseScanner.chore(BaseScanner.java:137)
    org.apache.hadoop.hbase.Chore.run(Chore.java:65)

I only see messages from the MetaScanner scanner in the master log, nothing from RootScanner.

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