CODEWITHSUNDEEP
hadoophbase
Terminal User
Terminal User

Reputation: 883

HBase connection exception

I try to run HBase in a Pseudo-Distributed mode. But it doesn't work after I set hbase-site.xml.

Each time I try to run a command inside hbase shell I get this error:

ERROR: org.apache.hadoop.hbase.ZooKeeperConnectionException: org.apache.hadoop.hbase.ZooKeeperConnectionException: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = connectionLoss for /hbase

I set up ssh and make sure all port are correct.

Moreover, I cannot stop hbase though ./bin/stop-hbase.sh. I only get the follow output.

stopping hbase........................................................

Upvotes: 9

Views: 11736

Answers (4)

timmy_stapler
timmy_stapler

Reputation: 577

i just fixed the problem by deleting the hbase.rootdir and the hbase.zookeeper.property.dataDir folders. for example:

more conf/hbase-site.xml

gives me: hbase.rootdir file:///somepath/hbase/testuser/hbase hbase.zookeeper.property.dataDir /somepath/hbase/testuser/zookeeper

then remove the old data:

rm -fr /somepath/hbase/testuser/hbase
mkdir -p /somepath/hbase/testuser/hbase
rm -fr /somepath/hbase/testuser/zookeeper
mkdir -p /somepath/hbase/testuser/zookeeper

then to start it:

bin/start-hbase.sh

and finally i could connect to the local instance:

./bin/hbase shell

Upvotes: 1

Romit
Romit

Reputation: 11

I had similar issue and got the same error message as above. In my case HMaster was not running. Using

sudo start-hbase.sh

resolved the issue.

Upvotes: 1

sbowman
sbowman

Reputation: 21

It's because the HBase documentation has you setup your HDFS settings to point to port 8020, but the Hadoop instructions configure HDFS for port 9000.

Change hbase-site.xml settings that HBase recommends to point to port 9000 instead:

<property>
  <name>hbase.rootdir</name>
  <value>hdfs://localhost:9000/hbase</value>
  <description>The directory shared by RegionServers.
  </description>
</property>

Upvotes: 2

David
David

Reputation: 3261

Pseudo-distributed means that you are running all of the processes on one machine. You need to check that all of the required processes are running:

Hadoop:

  • NameNode
  • DataNode
  • JobTracker
  • TaskTracker

Zookeeper:

  • HQuorumPeer

HBase:

  • HMaster
  • RegionServer

You also need to ensure that your hbase-site.xml contains the correct entries for zookeeper defining the host name and the port. The HBase FAQ and Wiki are really quite good. What are you missing from there?

Upvotes: 4

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