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https://issues.apache.org/jira/browse/HDFS-14999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17102860#comment-17102860
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Ayush Saxena commented on HDFS-14999:
-------------------------------------

Thanx [~vinayakumarb] for the review.
I ran the said test. The performance isn’t getting affected. Both took similar 
times in multiple runs, with the newer one taking negligible number of 
milliseconds less. 

This shouldn’t impact performance ideally. 
Please review!!’

> Avoid Potential Infinite Loop in DFSNetworkTopology
> ---------------------------------------------------
>
>                 Key: HDFS-14999
>                 URL: https://issues.apache.org/jira/browse/HDFS-14999
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ayush Saxena
>            Assignee: Ayush Saxena
>            Priority: Major
>         Attachments: HDFS-14999-01.patch
>
>
> {code:java}
>     do {
>       chosen = chooseRandomWithStorageTypeAndExcludeRoot(root, excludeRoot,
>           type);
>       if (excludedNodes == null || !excludedNodes.contains(chosen)) {
>         break;
>       } else {
>         LOG.debug("Node {} is excluded, continuing.", chosen);
>       }
>     } while (true);
> {code}
> Observed this loop getting stuck as part of testing HDFS-14913.
> There should be some exit condition or max retries here



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