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https://issues.apache.org/jira/browse/HDFS-16443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Akira Ajisaka resolved HDFS-16443.
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Fix Version/s: 3.2.4
Resolution: Fixed
Backported to branch-3.2.
> Fix edge case where DatanodeAdminDefaultMonitor doubly enqueues a
> DatanodeDescriptor on exception
> -------------------------------------------------------------------------------------------------
>
> Key: HDFS-16443
> URL: https://issues.apache.org/jira/browse/HDFS-16443
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Reporter: Kevin Wikant
> Assignee: Kevin Wikant
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.2.4, 3.3.3
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> As part of the fix merged in: https://issues.apache.org/jira/browse/HDFS-16303
> There was a rare edge case noticed in DatanodeAdminDefaultMonitor which
> causes a DatanodeDescriptor to be added twice to the pendingNodes queue.
> * a [datanode is unhealthy so it gets added to
> "unhealthyDns"]([https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminDefaultMonitor.java#L227)]
> * an exception is thrown which causes [this catch
> block](https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminDefaultMonitor.java#L271)
> to execute
> * the [datanode is added to
> "pendingNodes"]([https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminDefaultMonitor.java#L276)]
> * under certain conditions the [datanode can be added again from
> "unhealthyDns" to "pendingNodes"
> here]([https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminDefaultMonitor.java#L296)]
> This Jira is to track the 1 line fix for this bug
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