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From Josh Elser <>
Subject Re: Installing Accumulo in multinode setup
Date Thu, 06 Oct 2016 19:57:00 GMT
Hi Yamini,

The /tracers node in ZooKeeper was likely initialized previously using 
an Accumulo configuration that has a different value for 
instance.secret. You can delete this znode to move forward if you have 
no other Accumulo instance you intend to run on this ZK instance.

$ $ZOOKEEPER_HOME/bin/ -server m4:2181,m5:2181,m6:2181
 > rmr /tracers

You can also set a different value for trace.zookeeper.path in 
accumulo-site.xml. After doing this, you can try running a 
again to start the tracer.

You also mentioned that the Monitor did not start but did not include an 
exception for that service. The error you included only shows that the 
Accumulo Master/TabletServer did not correctly start and assign the 
system tables (accumulo.root and accumulo.metadata).

Yamini Joshi wrote:
> Hello all
> I am trying to configure a multinode cluster with accumulo. I am using 3
> machines with the config as follows:
> M4: Hadoop Master/Acc Slave
> M5: Accumulo Master/Monitor/Gc
> M6: Slave
> I have configured zookeeper ensemble on the cluster with all the 3
> nodes. The Hadoop part seems to work fine, I can see the console and run
> MR jobs easily. I can also see the zookeeper cluster with M2 as the
> leader. My problem is with accumulo, after accumulo init:
> bin/accumulo init
>   which seems to run without any error, after I isuue the command
> bin/
>   the Monitor process can't start. I am getting this error in my tracer log:
> [start.Main] ERROR: Thread 'tracer' died.
> org.apache.zookeeper.KeeperException$NoAuthException: KeeperErrorCode =
> NoAuth for /tracers/trace-
>      at
> org.apache.zookeeper.KeeperException.create(
>      at org.apache.zookeeper.KeeperException.create(
>      at org.apache.zookeeper.ZooKeeper.create(
>      at
> org.apache.accumulo.fate.zookeeper.ZooUtil.putEphemeralSequential(
>      at
> org.apache.accumulo.fate.zookeeper.ZooReaderWriter.putEphemeralSequential(
>      at
> org.apache.accumulo.tracer.TraceServer.registerInZooKeeper(
>      at org.apache.accumulo.tracer.TraceServer.<init>(
>      at org.apache.accumulo.tracer.TraceServer.main(
>      at
> org.apache.accumulo.tracer.TracerExecutable.execute(
>      at org.apache.accumulo.start.Main$
>      at
> And this in my monitor debug log:
> Failed to locate tablet for table : !0 row : ~err_\100
> I can see that the accumulo dir has been created in the HDFS. Can anyone
> please guide me set this up? I am attaching my config files here (Rest
> all the same generated as a result of bin_config file).
> Best regards,
> Yamini Joshi

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