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From "Josh Elser (JIRA)" <>
Subject [jira] [Created] (ACCUMULO-2964) Unexpected ThriftSecurityException from BatchScanner
Date Tue, 01 Jul 2014 05:09:25 GMT
Josh Elser created ACCUMULO-2964:

             Summary: Unexpected ThriftSecurityException from BatchScanner
                 Key: ACCUMULO-2964
             Project: Accumulo
          Issue Type: Bug
          Components: client, tserver
            Reporter: Josh Elser
            Priority: Minor
             Fix For: 1.7.0

This is something I've only seen a handful of times when writing/running tests that stop and
restart tservers. After the tserver is restarted, there is a thread (typically running in
the master) which is trying to read a table. As such, the thread will continue to poll until
the tserver comes up.

Very infrequently, the client gets a {{ThriftSecurityException}} with a code of {{DEFAULT_SECURITY_ERROR}}
and a message of {{Unknown security exception}}. There is no additional information in the
client log (from the thrift call inside the batchscanner), and the tserver contains no error
messages at all.

The error that the client saw.

2014-07-01 04:18:18,971 [impl.TabletServerBatchReaderIterator] DEBUG: Server : host:58090
msg : null
ThriftSecurityException(user:!SYSTEM, code:null)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$startMultiScan_result$
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$startMultiScan_result$
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$
        at org.apache.thrift.TServiceClient.receiveBase(
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(
        at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(
        at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(
        at org.apache.accumulo.core.metadata.MetadataLocationObtainer.lookupTablets(
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl.processInvalidated(
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl.binRanges(
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl.processInvalidated(
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl._locateTablet(
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl.locateTablet(
        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(
        at org.apache.accumulo.core.client.impl.ScannerIterator$
        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(
        at org.apache.accumulo.master.replication.DistributedWorkQueueWorkAssigner.createWork(
        at org.apache.accumulo.master.replication.DistributedWorkQueueWorkAssigner.assignWork(

The interesting part is that when the client saw this message, the new TabletServer was already
started, and the old tabletserver appears to have been dead for 20s. So, the client in the
master had been polling for 20s getting a ConnectException (connection refused) which is expected.
I don't know why we got this exception after a length of time.

The infrequency in which I see this makes me wonder if the random ports in the new tabletserver
are somehow re-grabbing the old tserver's thrift client service port and something is unexpectedly
being interpreted as this ThriftSecurityException? That's the only thing that seems remotely
possible to me. 

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