Vinay created HDFS-5146:
---------------------------
Summary: 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
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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