Aniket Mokashi created HDFS-13775:
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Summary: Add a conf property to retry dns reverse lookups during
datanode registration
Key: HDFS-13775
URL: https://issues.apache.org/jira/browse/HDFS-13775
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Aniket Mokashi
During DN registration, if the ip and the hostname in the DN InetAddress are
the same (i.e. reverse name lookup falied; see [the
javadoc|http://docs.oracle.com/javase/6/docs/api/java/net/InetAddress.html#getHostName%28%29]),
the DN will be disallowed to register, where the DN InetAddress was obtained
from the socket. It is a performance improvement added by HDFS-3990 to avoid
unnecessary DNS resolutions. However, in an environment where DNS lookups can
be flaky this can cause datanode registration to fail permanently.
We propose to add a conf property to retry DNS reverse lookup during DN
registration. Otherwise, clusters with flaky reverse DNS lookup will fail
permanently.
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