Jose Luis Navarro created HBASE-18443:
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Summary: RegionServer register twice if there is no reverse DNS
lookup available
Key: HBASE-18443
URL: https://issues.apache.org/jira/browse/HBASE-18443
Project: HBase
Issue Type: Bug
Components: master, regionserver
Affects Versions: 1.1.2
Environment: Centos 7 on Microsoft Azure
HBase 1.1.2 provided by Hortonworks HDP 2.5 stack
Installed and managed with Apache Ambari
Reporter: Jose Luis Navarro
Priority: Minor
HBase does not complain if there is no reverse DNS lookup possible for the
master or regionserver nodes.
If the master is unable to verify the identity of a regionserver using the
reverse DNS lookup, the node is added twice to the list of available
regionservers (Once with the FQDN the node presents itself and another one as
the IP address).
When this happens HBase is unusable and metadata is corrupted.
Hadoop also relies on reverse DNS but it complains if it is not possible to
honor it unless you explicitly disable the lookup in the configuration. On the
other hand HBase does not complain and simply does not work if the reverse
lookup is not posible.
It can be fixed by simply adding entries to /etc/hosts file with the
regionservers, but this can become unmanageable if the cluster can grow
dynamically in a cloud service like Azure.
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