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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12532) DN Reg can Fail when principal doesn't contain hostname and floatingIP is configured.
Date Wed, 25 Oct 2017 05:21:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16218114#comment-16218114

Brahma Reddy Battula commented on HDFS-12532:

bq.I recommend either switching your interface and aliased ips
Looks It's not possible in our environment. It used for another components also.
bq. set dfs.namenode.datanode.registration.ip-hostname-check=false.
This can aviod the ERROR, but it will overide the [folating IP|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java#L1025]
hence clients will get this IP from Namenode but Datanode will listen on another IP?

I feel, when principal having hostname which can't resolvable (i.e bindAddr = null),we can
have one config like below..? This can be configured DualIP machines.

          if (bindAddr == null) {
            String bindAddrIp = conf.get(
            if (bindAddrIp != null && !bindAddrIp.isEmpty()) {
              bindAddr = new InetSocketAddress(bindAddrIp, 0);

> DN Reg can Fail when principal doesn't contain hostname and floatingIP is configured.
> -------------------------------------------------------------------------------------
>                 Key: HDFS-12532
>                 URL: https://issues.apache.org/jira/browse/HDFS-12532
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Brahma Reddy Battula
> Configure principal without hostname (i.e hdfs/hadoop@HADOOP.com)
> Configure floatingIP
> Start Cluster.
> Here DN will fail to register as it can take IP which is not in "/etc/hosts".

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