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https://issues.apache.org/jira/browse/HDFS-14470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ayush Saxena resolved HDFS-14470.
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Resolution: Duplicate
> DataNode.startDataNode() throws a DiskErrorException when the configuration
> has wrong values
> --------------------------------------------------------------------------------------------
>
> Key: HDFS-14470
> URL: https://issues.apache.org/jira/browse/HDFS-14470
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: eBugs
> Priority: Minor
>
> Dear HDFS developers, we are developing a tool to detect exception-related
> bugs in Java. Our prototype has spotted the following {{throw}} statement
> whose exception class and error message indicate different error conditions.
>
> Version: Hadoop-3.1.2
> File:
> HADOOP-ROOT/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
> Line: 1407-1410
> {code:java}
> throw new DiskErrorException("Invalid value configured for "
> + "dfs.datanode.failed.volumes.tolerated - " + volFailuresTolerated
> + ". Value configured is either less than -1 or >= "
> + "to the number of configured volumes (" + volsConfigured + ").");{code}
>
> A {{DiskErrorException}} means an error has occurred when the process is
> interacting with the disk, e.g., in
> {{org.apache.hadoop.util.DiskChecker.checkDirInternal()}} we have the
> following code (lines 97-98):
> {code:java}
> throw new DiskErrorException("Cannot create directory: " +
> dir.toString());{code}
> However, the error message of the first exception indicates that
> {{dfs.datanode.failed.volumes.tolerated}} is configured incorrectly, which
> means there is nothing wrong with the disk (yet). This mismatch could be a
> problem. For example, the callers trying to handle other
> {{DiskErrorException}} may accidentally (and incorrectly) handle the
> configuration error.
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