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https://issues.apache.org/jira/browse/HDFS-5146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinay updated HDFS-5146:
------------------------
Status: Patch Available (was: Open)
> JspHelper#bestNode() doesn't handle bad datanodes correctly
> -----------------------------------------------------------
>
> Key: HDFS-5146
> URL: https://issues.apache.org/jira/browse/HDFS-5146
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.1.0-beta, 3.0.0
> Reporter: Vinay
> Assignee: Vinay
> Attachments: HDFS-5146.patch
>
>
> JspHelper#bestNode() doesn't handle bad datanodes correctly if the chosen
> datanode is down.
> {code} while (s == null) {
> if (chosenNode == null) {
> do {
> if (doRandom) {
> index = DFSUtil.getRandom().nextInt(nodes.length);
> } else {
> index++;
> }
> chosenNode = nodes[index];
> } while (deadNodes.contains(chosenNode));
> }
> chosenNode = nodes[index];
> {code}
> In this part of the code, choosing the datanode will be done only once.
> If the chosen datanode is down, then definitely exception will be thrown
> instead of re-chosing the available node.
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