Aniket Mokashi created HDFS-13775: ------------------------------------- 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-dev-h...@hadoop.apache.org