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From Alex Lee <a...@orbistechnologies.com>
Subject RE: Tablet server stuck waiting for lock
Date Wed, 05 Mar 2014 17:36:35 GMT
Thank you for the quick response.

Where should I post the logs for you to access them? I’m relatively new to mailing lists,
so I’m not sure what standard procedure for that is.

I’m running 3 ZooKeeper servers. IPtables is off for all nodes. The netcat test was done
both locally and remotely for each zookeeper node. This cluster is being virtualized on Xen,
the old one was on KVM.

Thanks again,

Alex

From: Sean Busbey [mailto:busbey+lists@cloudera.com]
Sent: Wednesday, March 05, 2014 12:28 PM
To: Accumulo User List
Subject: Re: Tablet server stuck waiting for lock

Hi Alex!

Can you post your logs somewhere?

How many zookeeper servers are you running?

Is iptables enabled?

was your netcat test run local to the zookeeper server or on a remote server?

What virtualization platform is this running on top of?

-Sean

On Wed, Mar 5, 2014 at 11:17 AM, Alex Lee <alee@orbistechnologies.com<mailto:alee@orbistechnologies.com>>
wrote:
Hello,

I’m trying to create a virtualized Accumulo 1.4.4 cluster with 4 tablet servers using Hadoop
0.20.2 and ZooKeeper 3.3.5. It didn’t seem to be working correctly with 4 tablet servers,
so I first tried just running with one tablet server, which seemed to work fine. When I tried
to run it with just 2 tablet servers, I ran into some issues.

Just to preface, I double checked configs within zookeeper and accumulo, and everything matches.
All hostnames are resolving correctly, and passwordless SSH for the accumulo user is also
functional between all nodes. Running “echo stat | nc <zk-server> <zk port>”
responds appropriately.

Here’s the first error log for the Tablet Master:

2014-03-05 11:18:16,626 [master.Master] ERROR: Error processing table state for store Root
Tablet
org.apache.thrift.transport.TTransportException: java.io.IOException: Connection reset by
peer
        at org.apache.thrift.transport.TIOStreamTransport.flush(TIOStreamTransport.java:161)
        at org.apache.thrift.transport.TFramedTransport.flush(TFramedTransport.java:158)
        at org.apache.accumulo.core.client.impl.ThriftTransportPool$CachedTTransport.flush(ThriftTransportPool.java:299)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.send_loadTablet(TabletClientService.java:653)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.loadTablet(TabletClientService.java:640)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.accumulo.cloudtrace.instrument.thrift.TraceWrap$2.invoke(TraceWrap.java:84)
        at com.sun.proxy.$Proxy4.loadTablet(Unknown Source)
        at org.apache.accumulo.server.master.LiveTServerSet$TServerConnection.assignTablet(LiveTServerSet.java:86)
        at org.apache.accumulo.server.master.Master$TabletGroupWatcher.flushChanges(Master.java:1818)
        at org.apache.accumulo.server.master.Master$TabletGroupWatcher.run(Master.java:1426)
Caused by: java.io.IOException: Connection reset by peer
        at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
        at sun.nio.ch.SocketDispatcher.write(Unknown Source)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
        at sun.nio.ch.IOUtil.write(Unknown Source)
        at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
        at org.apache.hadoop.net.SocketOutputStream$Writer.performIO(SocketOutputStream.java:55)
        at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:142)
        at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:146)
        at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:107)
        at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
        at java.io.BufferedOutputStream.flush(Unknown Source)
        at org.apache.thrift.transport.TIOStreamTransport.flush(TIOStreamTransport.java:159)
        ... 13 more

Here are the error logs for Tablet Server #1:

2014-03-05 11:17:15,152 [tabletserver.TabletServer] INFO : Tablet server starting on 172.16.111.3
2014-03-05 11:17:15,187 [util.FileSystemMonitor] INFO : Filesystem monitor started
2014-03-05 11:17:15,194 [tabletserver.NativeMap] INFO : Loaded native map shared library /opt/accumulo/accumulo/lib/native/map/libNativeMap-Linux-amd64-64.so
2014-03-05 11:17:15,499 [tabletserver.TabletServer] INFO : port = 9997
2014-03-05 11:17:15,540 [tabletserver.TabletServer] INFO : Waiting for tablet server lock
2014-03-05 11:17:16,633 [tabletserver.TabletServer] WARN : Got loadTablet message from master
before lock acquired, ignoring...
2014-03-05 11:17:16,634 [server.TNonblockingServer] ERROR: Unexpected exception while invoking!
java.lang.RuntimeException: Lock not acquired
        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.checkPermission(TabletServer.java:1782)
        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.loadTablet(TabletServer.java:1814)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.accumulo.cloudtrace.instrument.thrift.TraceWrap$1.invoke(TraceWrap.java:59)
        at com.sun.proxy.$Proxy1.loadTablet(Unknown Source)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$loadTablet.process(TabletClientService.java:2510)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor.process(TabletClientService.java:2053)
        at org.apache.accumulo.server.util.TServerUtils$TimedProcessor.process(TServerUtils.java:154)
        at org.apache.thrift.server.TNonblockingServer$FrameBuffer.invoke(TNonblockingServer.java:631)
        at org.apache.accumulo.server.util.TServerUtils$THsHaServer$Invocation.run(TServerUtils.java:202)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
        at java.lang.Thread.run(Unknown Source)
2014-03-05 11:17:20,564 [tabletserver.TabletServer] INFO : Waiting for tablet server lock
2014-03-05 11:17:25,589 [tabletserver.TabletServer] INFO : Waiting for tablet server lock

(continues until too many retries, then exits)

Tablet Server #2’s logs get as far as this (below), and then just stop.

2014-03-05 11:17:14,112 [tabletserver.TabletServer] INFO : Tablet server starting on 172.16.111.3
2014-03-05 11:17:14,149 [util.FileSystemMonitor] INFO : Filesystem monitor started
2014-03-05 11:17:14,157 [tabletserver.NativeMap] INFO : Loaded native map shared library /opt/accumulo/accumulo/lib/native/map/libNativeMap-Linux-amd64-64.so
2014-03-05 11:17:14,481 [tabletserver.TabletServer] INFO : port = 9997

Also, the master logs interestingly never make any calls to Tablet #2’s IP address.

Any thoughts? We have another cluster that is setup identically in just about every way (besides
hostnames), but it has never experienced any of these issues. My research shows that these
issues can exist within 1.4.3, which we were using at first, but we switched to 1.4.4 because
these types of issues were supposed to be resolved. Any help would be greatly appreciated.

Thanks,

Alex Lee

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