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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-4065) Strange temporary errors in Master after upgrade
Date Fri, 20 Nov 2015 02:54:10 GMT
Josh Elser created ACCUMULO-4065:
------------------------------------

             Summary: Strange temporary errors in Master after upgrade
                 Key: ACCUMULO-4065
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4065
             Project: Accumulo
          Issue Type: Bug
          Components: master
            Reporter: Josh Elser
            Assignee: Josh Elser


I'm running into a problem that I saw quite a while back in ACCUMULO-3653

I'm still trying to understand what happened, but what I understand so far is that, Accumulo
was running, a newer version was installed beside the running version, Accumulo was stopped,
the symlink changed, and the new version was started. After this, we started seeing a number
of errors in the Master. Shortly after that, the cluster was restarted and the errors stopped
happening.

This is what I can extract from the logs:

{noformat}
2015-11-19 22:42:47,115 [rpc.TServerUtils] DEBUG: Instantiating default, unsecure custom half-async
Thrift server
2015-11-19 22:42:47,122 [master.Master] INFO : Started replication coordinator service at
host3:10001
2015-11-19 22:42:47,158 [master.Master] ERROR: Error processing table state for store Normal
Tablets
java.lang.RuntimeException: java.lang.RuntimeException: Failed to create iterator
	at org.apache.accumulo.server.master.state.MetaDataTableScanner.<init>(MetaDataTableScanner.java:72)
	at org.apache.accumulo.server.master.state.MetaDataTableScanner.<init>(MetaDataTableScanner.java:56)
	at org.apache.accumulo.server.master.state.MetaDataStateStore.iterator(MetaDataStateStore.java:62)
	at org.apache.accumulo.master.TabletGroupWatcher.run(TabletGroupWatcher.java:172)
Caused by: java.lang.RuntimeException: Failed to create iterator
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.<init>(TabletServerBatchReaderIterator.java:158)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReader.iterator(TabletServerBatchReader.java:115)
	at org.apache.accumulo.server.master.state.MetaDataTableScanner.<init>(MetaDataTableScanner.java:66)
	... 3 more
Caused by: org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server host3:9997
	at org.apache.accumulo.core.client.impl.ThriftScanner.getBatchFromServer(ThriftScanner.java:116)
	at org.apache.accumulo.core.metadata.MetadataLocationObtainer.lookupTablet(MetadataLocationObtainer.java:95)
	at org.apache.accumulo.core.client.impl.TabletLocatorImpl.lookupTabletLocation(TabletLocatorImpl.java:463)
	at org.apache.accumulo.core.client.impl.TabletLocatorImpl.lookupTabletLocationAndCheckLock(TabletLocatorImpl.java:634)
	at org.apache.accumulo.core.client.impl.TabletLocatorImpl._locateTablet(TabletLocatorImpl.java:625)
	at org.apache.accumulo.core.client.impl.TabletLocatorImpl.binRanges(TabletLocatorImpl.java:280)
	at org.apache.accumulo.core.client.impl.TabletLocatorImpl.binRanges(TabletLocatorImpl.java:355)
	at org.apache.accumulo.core.client.impl.TimeoutTabletLocator.binRanges(TimeoutTabletLocator.java:100)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.binRanges(TabletServerBatchReaderIterator.java:233)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.lookup(TabletServerBatchReaderIterator.java:220)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.<init>(TabletServerBatchReaderIterator.java:154)
	... 5 more
Caused by: org.apache.thrift.TApplicationException: Internal error processing flush
	at org.apache.thrift.TApplicationException.read(TApplicationException.java:111)
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:71)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startScan(TabletClientService.java:232)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startScan(TabletClientService.java:208)
	at org.apache.accumulo.core.client.impl.ThriftScanner.getBatchFromServer(ThriftScanner.java:98)
	... 15 more
2015-11-19 22:42:47,178 [impl.ThriftScanner] DEBUG: Scan failed, not serving tablet (+r<<,host4:9997,35121a475360010)
2015-11-19 22:42:47,202 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: NotServingTabletException(extent:TKeyExtent(table:2B 72, endRow:null, prevEndRow:null))
2015-11-19 22:42:47,283 [impl.ThriftScanner] DEBUG: Scan failed, not serving tablet (+r<<,host4:9997,35121a475360010)
2015-11-19 22:42:47,372 [impl.TabletServerBatchReaderIterator] DEBUG: Server : host4:9997
msg : startMultiScan failed: unknown result
org.apache.thrift.TApplicationException: startMultiScan failed: unknown result
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:324)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:42:47,373 [impl.TabletServerBatchReaderIterator] WARN : Error on server host4:9997
org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server host4:9997
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:695)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.TApplicationException: startMultiScan failed: unknown result
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:324)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	... 6 more
2015-11-19 22:42:47,376 [master.Master] ERROR: Error processing table state for store Metadata
Tablets
java.lang.RuntimeException: org.apache.accumulo.core.client.impl.AccumuloServerException:
Error on server host4:9997
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.hasNext(TabletServerBatchReaderIterator.java:181)
	at org.apache.accumulo.server.master.state.MetaDataTableScanner.hasNext(MetaDataTableScanner.java:121)
	at org.apache.accumulo.master.TabletGroupWatcher.run(TabletGroupWatcher.java:173)
Caused by: org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server host4:9997
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:695)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.TApplicationException: startMultiScan failed: unknown result
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:324)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	... 6 more
{noformat}

A bit later:

{noformat}
2015-11-19 22:43:04,572 [recovery.RecoveryManager] DEBUG: Recovering hdfs://mycluster/apps/accumulo/data/wal/host4+9997/a2831ffa-c980-47bf-9f33-14716a0df6ec
to hdfs://mycluster/apps/accumulo/data/recovery/a2831ffa-c980-47bf-9f33-14716a0df6ec
2015-11-19 22:43:04,575 [impl.TabletServerBatchReaderIterator] DEBUG: Server : host4:9997
msg : closeMultiScan failed: out of sequence response
org.apache.thrift.TApplicationException: closeMultiScan failed: out of sequence response
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:76)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_closeMultiScan(TabletClientService.java:371)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.closeMultiScan(TabletClientService.java:357)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:681)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:43:04,575 [impl.TabletServerBatchReaderIterator] WARN : Error on server host4:9997
org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server host4:9997
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:695)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.TApplicationException: closeMultiScan failed: out of sequence
response
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:76)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_closeMultiScan(TabletClientService.java:371)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.closeMultiScan(TabletClientService.java:357)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:681)
	... 6 more
2015-11-19 22:43:04,576 [master.Master] ERROR: Error processing table state for store Metadata
Tablets
java.lang.RuntimeException: org.apache.accumulo.core.client.impl.AccumuloServerException:
Error on server host4:9997
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.hasNext(TabletServerBatchReaderIterator.java:181)
	at org.apache.accumulo.server.master.state.MetaDataTableScanner.hasNext(MetaDataTableScanner.java:121)
	at org.apache.accumulo.master.TabletGroupWatcher.run(TabletGroupWatcher.java:173)
Caused by: org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server host4:9997
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:695)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.TApplicationException: closeMultiScan failed: out of sequence
response
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:76)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_closeMultiScan(TabletClientService.java:371)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.closeMultiScan(TabletClientService.java:357)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:681)
	... 6 more
2015-11-19 22:43:04,882 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got c
2015-11-19 22:43:04,985 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got 0
2015-11-19 22:43:05,089 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got 16
2015-11-19 22:43:05,192 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got ffffffd6
2015-11-19 22:43:05,296 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got fffffff1
2015-11-19 22:43:05,399 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got ffffffb7
2015-11-19 22:43:05,502 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got ffffffe4
2015-11-19 22:43:05,605 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got ffffff98
2015-11-19 22:43:05,687 [impl.TabletServerBatchReaderIterator] DEBUG: Server : host4:9997
msg : Expected protocol id ffffff82 but got fffffff7
org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got fffffff7
	at org.apache.thrift.protocol.TCompactProtocol.readMessageBegin(TCompactProtocol.java:472)
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:69)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:317)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:43:05,688 [impl.TabletServerBatchReaderIterator] DEBUG: org.apache.thrift.protocol.TProtocolException:
Expected protocol id ffffff82 but got fffffff7
java.io.IOException: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82
but got fffffff7
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:702)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but
got fffffff7
	at org.apache.thrift.protocol.TCompactProtocol.readMessageBegin(TCompactProtocol.java:472)
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:69)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:317)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	... 6 more
2015-11-19 22:43:05,708 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got ffffffcf
2015-11-19 22:43:05,793 [impl.TabletServerBatchReaderIterator] DEBUG: Server : host4:9997
msg : Expected protocol id ffffff82 but got ffffffc6
org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got ffffffc6
	at org.apache.thrift.protocol.TCompactProtocol.readMessageBegin(TCompactProtocol.java:472)
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:69)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:317)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:43:05,794 [impl.TabletServerBatchReaderIterator] DEBUG: org.apache.thrift.protocol.TProtocolException:
Expected protocol id ffffff82 but got ffffffc6
java.io.IOException: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82
but got ffffffc6
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:702)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but
got ffffffc6
	at org.apache.thrift.protocol.TCompactProtocol.readMessageBegin(TCompactProtocol.java:472)
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:69)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:317)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	... 6 more
2015-11-19 22:43:05,810 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got ffffffd4
2015-11-19 22:43:05,913 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got 1
2015-11-19 22:43:05,960 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got 1c
2015-11-19 22:43:05,997 [impl.TabletServerBatchReaderIterator] DEBUG: Server : host4:9997
msg : Expected protocol id ffffff82 but got 19
org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but got 19
	at org.apache.thrift.protocol.TCompactProtocol.readMessageBegin(TCompactProtocol.java:472)
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:69)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:317)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:43:05,998 [impl.TabletServerBatchReaderIterator] DEBUG: org.apache.thrift.protocol.TProtocolException:
Expected protocol id ffffff82 but got 19
java.io.IOException: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82
but got 19
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:702)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.protocol.TProtocolException: Expected protocol id ffffff82 but
got 19
	at org.apache.thrift.protocol.TCompactProtocol.readMessageBegin(TCompactProtocol.java:472)
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:69)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startMultiScan(TabletClientService.java:317)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startMultiScan(TabletClientService.java:297)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:634)
	... 6 more
2015-11-19 22:43:06,006 [master.Master] WARN : Lost servers [host5:9997[25121a475480008]]
{noformat}

And even later

{noformat}
2015-11-19 22:43:41,810 [tracer.ZooTraceClient] DEBUG: Processing event for trace server zk
watch
2015-11-19 22:43:41,812 [tracer.ZooTraceClient] DEBUG: Scanning trace hosts in zookeeper:
/tracers
2015-11-19 22:43:41,813 [tracer.ZooTraceClient] DEBUG: Trace hosts: [10.240.0.76:12234, 10.240.0.76:12234]
2015-11-19 22:43:42,066 [impl.TabletServerBatchReaderIterator] WARN : null column family
java.lang.IllegalArgumentException: null column family
	at org.apache.accumulo.core.data.Key.<init>(Key.java:391)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:647)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:43:42,070 [master.Master] ERROR: Error processing table state for store Metadata
Tablets
java.lang.IllegalArgumentException: null column family
	at org.apache.accumulo.core.data.Key.<init>(Key.java:391)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:647)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:43:43,178 [impl.TabletServerBatchReaderIterator] WARN : null column family
java.lang.IllegalArgumentException: null column family
	at org.apache.accumulo.core.data.Key.<init>(Key.java:391)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:647)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:43:43,178 [master.Master] ERROR: Error processing table state for store Metadata
Tablets
java.lang.IllegalArgumentException: null column family
	at org.apache.accumulo.core.data.Key.<init>(Key.java:391)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:647)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:43:44,284 [impl.TabletServerBatchReaderIterator] WARN : null column family
java.lang.IllegalArgumentException: null column family
	at org.apache.accumulo.core.data.Key.<init>(Key.java:391)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator.doLookup(TabletServerBatchReaderIterator.java:647)
	at org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator$QueryTask.run(TabletServerBatchReaderIterator.java:349)
	at org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$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}

And even more

{noformat}
2015-11-19 22:44:05,375 [recovery.RecoveryManager] DEBUG: Recovering hdfs://mycluster/apps/accumulo/data/wal/host4+9997/a2831ffa-c980-47bf-9f33-14716a0df6ec
to hdfs://mycluster/apps/accumulo/data/recovery/a2831ffa-c980-47bf-9f33-14716a0df6ec
2015-11-19 22:44:05,385 [master.Master] DEBUG: 2 assigned to dead servers: [!0;~<@(null,host4:9997[35121a475360010],host4:9997[35121a475360010]),
!0<;~@(null,host5:9997[25121a475480008],host5:9997[25121a475480008])]...
2015-11-19 22:44:05,405 [impl.TabletServerBatchWriter] ERROR: Server side error on host4:9997:
org.apache.thrift.TApplicationException: startUpdate failed: unknown result
2015-11-19 22:44:05,405 [master.Master] ERROR: Error processing table state for store Metadata
Tablets
org.apache.accumulo.server.master.state.DistributedStoreException: org.apache.accumulo.core.client.MutationsRejectedException:
# constraint violations : 0  security codes: {}  # server errors 1 # exceptions 0
	at org.apache.accumulo.server.master.state.MetaDataStateStore.unassign(MetaDataStateStore.java:139)
	at org.apache.accumulo.master.TabletGroupWatcher.flushChanges(TabletGroupWatcher.java:738)
	at org.apache.accumulo.master.TabletGroupWatcher.run(TabletGroupWatcher.java:295)
Caused by: org.apache.accumulo.core.client.MutationsRejectedException: # constraint violations
: 0  security codes: {}  # server errors 1 # exceptions 0
	at org.apache.accumulo.core.client.impl.TabletServerBatchWriter.checkForFailures(TabletServerBatchWriter.java:550)
	at org.apache.accumulo.core.client.impl.TabletServerBatchWriter.close(TabletServerBatchWriter.java:361)
	at org.apache.accumulo.core.client.impl.BatchWriterImpl.close(BatchWriterImpl.java:54)
	at org.apache.accumulo.server.master.state.MetaDataStateStore.unassign(MetaDataStateStore.java:137)
	... 2 more
2015-11-19 22:44:05,406 [impl.TabletServerBatchWriter] ERROR: Failed to send tablet server
host4:9997 its batch : Error on server host4:9997
org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server host4:9997
	at org.apache.accumulo.core.client.impl.TabletServerBatchWriter$MutationWriter.sendMutationsToTabletServer(TabletServerBatchWriter.java:950)
	at org.apache.accumulo.core.client.impl.TabletServerBatchWriter$MutationWriter.access$1900(TabletServerBatchWriter.java:629)
	at org.apache.accumulo.core.client.impl.TabletServerBatchWriter$MutationWriter$SendTask.send(TabletServerBatchWriter.java:816)
	at org.apache.accumulo.core.client.impl.TabletServerBatchWriter$MutationWriter$SendTask.run(TabletServerBatchWriter.java:780)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.TApplicationException: startUpdate failed: unknown result
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startUpdate(TabletClientService.java:403)
	at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startUpdate(TabletClientService.java:381)
	at org.apache.accumulo.core.client.impl.TabletServerBatchWriter$MutationWriter.sendMutationsToTabletServer(TabletServerBatchWriter.java:893)
	... 9 more
{noformat}

And, curiously, after this exception, things seem to get happy:

{noformat}
2015-11-19 22:46:35,247 [transport.TIOStreamTransport] WARN : Error closing output stream.
java.io.IOException: The stream is closed
        at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:118)
        at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
        at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
        at java.io.FilterOutputStream.close(FilterOutputStream.java:158)
        at org.apache.thrift.transport.TIOStreamTransport.close(TIOStreamTransport.java:110)
        at org.apache.thrift.transport.TFramedTransport.close(TFramedTransport.java:89)
        at org.apache.accumulo.core.client.impl.ThriftTransportPool$CachedTTransport.close(ThriftTransportPool.java:309)
        at org.apache.accumulo.core.client.impl.ThriftTransportPool.returnTransport(ThriftTransportPool.java:571)
        at org.apache.accumulo.core.rpc.ThriftUtil.returnClient(ThriftUtil.java:147)
        at org.apache.accumulo.core.client.impl.ThriftScanner.getBatchFromServer(ThriftScanner.java:113)
        at org.apache.accumulo.core.metadata.MetadataLocationObtainer.lookupTablet(MetadataLocationObtainer.java:95)
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl.lookupTabletLocation(TabletLocatorImpl.java:463)
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl.lookupTabletLocationAndCheckLock(TabletLocatorImpl.java:634)
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl._locateTablet(TabletLocatorImpl.java:620)
        at org.apache.accumulo.core.client.impl.TabletLocatorImpl.locateTablet(TabletLocatorImpl.java:439)
        at org.apache.accumulo.core.client.impl.Writer.update(Writer.java:88)
        at org.apache.accumulo.server.util.MetadataTableUtil.update(MetadataTableUtil.java:153)
        at org.apache.accumulo.server.util.MetadataTableUtil.update(MetadataTableUtil.java:145)
        at org.apache.accumulo.server.util.MetadataTableUtil.addTablet(MetadataTableUtil.java:211)
        at org.apache.accumulo.master.tableOps.PopulateMetadata.call(PopulateMetadata.java:43)
        at org.apache.accumulo.master.tableOps.PopulateMetadata.call(PopulateMetadata.java:25)
        at org.apache.accumulo.master.tableOps.TraceRepo.call(TraceRepo.java:57)
        at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:72)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
        at java.lang.Thread.run(Thread.java:745)
2015-11-19 22:46:35,249 [impl.ThriftScanner] DEBUG: Error getting transport to host4:9997
: org.apache.thrift.transport.TTransportException: java.net.SocketTimeoutException: 120000
millis timeout while wai
ting for channel to be ready for write. ch : java.nio.channels.SocketChannel[connected local=/10.240.0.76:40610
remote=host4/10.240.0.77:9997]
2015-11-19 22:46:35,258 [replication.ReplicationDriver] ERROR: Caught Exception trying to
create Replication status records
java.lang.RuntimeException: org.apache.accumulo.core.client.impl.AccumuloServerException:
Error on server host5:9997
        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:161)
        at org.apache.accumulo.master.replication.StatusMaker.run(StatusMaker.java:94)
        at org.apache.accumulo.master.replication.ReplicationDriver.run(ReplicationDriver.java:87)
Caused by: org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server host5:9997
        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:293)
        at org.apache.accumulo.core.client.impl.ScannerIterator$Reader.run(ScannerIterator.java:80)
        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:151)
        ... 2 more
Caused by: org.apache.thrift.TApplicationException: Internal error processing flush
        at org.apache.thrift.TApplicationException.read(TApplicationException.java:111)
        at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:71)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startScan(TabletClientService.java:232)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startScan(TabletClientService.java:208)
        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:410)
        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:285)
        ... 4 more
{noformat}



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