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From Cosmin Cătălin Sanda <cosmincata...@gmail.com>
Subject HBase Master cannot be contacted by Region Servers
Date Wed, 09 Jul 2014 13:18:24 GMT
I have a Hadoop cluster made of 3 slaves and 1 master on top of which
there is an HBase cluster with 3 RS and 1 master respectively.
Additionally there is a Zookeeper ensemble on 3 machines.

The Hadoop cluster is functioning correctly as well as the Zookeeper
ensemble. However, the HBase cluster fails to initialize correctly.

I start HBase it by running ./bin/start-hbase.sh. This correctly
starts the HBase Master and the Region Servers. The hbase folder in
hdfs is set-up correctly.

jps on master

hduser@master:~/hbase$ jps
5694 HMaster
3934 JobHistoryServer
3786 NameNode
3873 ResourceManager
6025 Jps

jps on slaves

5737 Jps
5499 HRegionServer
3736 DataNode
3820 NodeManager

However, the HBase master does not register the Region Servers as it
is also apparent from looking at the logs:

master log

[master:master:60000] master.ServerManager: Waiting for region servers
count to settle; currently checked in 0, slept for 1511 ms, expecting
minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of
1500 ms.

slave log

[regionserver60020] regionserver.HRegionServer: reportForDuty to
master=master,60000,1404856451890 with port=60020,
[regionserver60020] regionserver.HRegionServer: error telling master we are up
org.apache.hadoop.net.ConnectTimeoutException: 20000 millis timeout
while waiting for channel to be ready for connect. ch :
local=/ remote=master/]

Here are the configuration details:

/etc/hosts on master   slave-3 # Data Node and Region Server   master # Name Node and HBase Master   zookeeper-3 # Zookeeper node   zookeeper-1 # Zookeeper node   zookeeper-2 # Zookeeper node   slave-2 # Data Node and Region Server   slave-1 # Data Node and Region Server

/etc/hosts on slave-1   master   zookeeper-3   zookeeper-1   zookeeper-2

hbase-site.xml on ALL cluster nodes

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

regionservers file on master and slaves


hbase-env.sh on master and slaves

export JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::"
export HBASE_OPTS="-XX:+UseConcMarkSweepGC"
export HBASE_MANAGES_ZK=false

What am I doing wrong so that the nodes cannot talk to each other?

I am using Hadoop 2.4.0 and HBase 0.98.3 along with Zookeeper 3.4.6 on
Ubuntu Trusty Tahr x64.

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