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https://issues.apache.org/jira/browse/HDFS-13522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192877#comment-17192877
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Hemanth Boyina commented on HDFS-13522:
---------------------------------------
thanks [~surendrasingh] for the review
{quote} # Load balancing between multiple observer.{quote}
we are shuffling the observers so that same observer doesn't always receive the
call
{code:java}
// shuffle the observers if observer are greater than 1
// so same observer doesn't come always
if (observerRead && observerMemberships.size() > 1) {
Collections.shuffle(observerMemberships);
Collections
.sort(nonObserverMemberships, new NamenodePriorityComparator());
} {code}
{quote}2.Webhdfs call, I think you may get NPE for webhdfs call
{quote}
will fix and add a test case and will update the patch
> Support observer node from Router-Based Federation
> --------------------------------------------------
>
> Key: HDFS-13522
> URL: https://issues.apache.org/jira/browse/HDFS-13522
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: federation, namenode
> Reporter: Erik Krogen
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-13522.001.patch, HDFS-13522_WIP.patch, RBF_
> Observer support.pdf, Router+Observer RPC clogging.png,
> ShortTerm-Routers+Observer.png
>
>
> Changes will need to occur to the router to support the new observer node.
> One such change will be to make the router understand the observer state,
> e.g. {{FederationNamenodeServiceState}}.
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