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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3954) Demote warning/error about RPCs received in tabletserver before lock is acquired
Date Thu, 06 Aug 2015 17:10:17 GMT
Josh Elser created ACCUMULO-3954:
------------------------------------

             Summary: Demote warning/error about RPCs received in tabletserver before lock
is acquired
                 Key: ACCUMULO-3954
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3954
             Project: Accumulo
          Issue Type: Bug
          Components: tserver
    Affects Versions: 1.7.0, 1.6.3
            Reporter: Josh Elser
            Assignee: Josh Elser
            Priority: Trivial
             Fix For: 1.8.0


Noticed this error today on the monitor after restarting Accumulo:

{noformat}
2015-08-06 16:57:10,788 [tserver.TabletServer] WARN : tserver:hostname Got getScans message
from master before lock acquired, ignoring...
2015-08-06 16:57:10,791 [tserver.TabletServer$ThriftClientHandler] ERROR: tserver:jelser-phoenix-1.openstacklocal
Lock not acquired
java.lang.RuntimeException: Lock not acquired
        at org.apache.accumulo.tserver.TabletServer$ThriftClientHandler.checkPermission(TabletServer.java:1400)
        at org.apache.accumulo.tserver.TabletServer$ThriftClientHandler.getActiveScans(TabletServer.java:1622)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.apache.accumulo.core.trace.wrappers.RpcServerInvocationHandler.invoke(RpcServerInvocationHandler.java:39)
        at org.apache.accumulo.server.rpc.RpcWrapper$1.invoke(RpcWrapper.java:47)
        at com.sun.proxy.$Proxy21.getActiveScans(Unknown Source)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$getActiveScans.getResult(TabletClientService.java:2864)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$getActiveScans.getResult(TabletClientService.java:2848)
        at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
        at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
        at org.apache.accumulo.server.rpc.TimedProcessor.process(TimedProcessor.java:63)
        at org.apache.thrift.server.AbstractNonblockingServer$FrameBuffer.invoke(AbstractNonblockingServer.java:516)
        at org.apache.accumulo.server.rpc.CustomNonBlockingServer$1.run(CustomNonBlockingServer.java:78)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
        at java.lang.Thread.run(Thread.java:745)
{noformat}

I don't think this should be bubbling up to the monitor as an error. I believe it is an entirely
normal race condition that can happen. If the tabletserver is not ready to accept an RPC,
it can log a message at debug. The error condition would be a tabletserver never acquiring
its lock (and thus should be handled elsewhere).



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