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https://issues.apache.org/jira/browse/HDFS-14469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16834358#comment-16834358
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eBugs commented on HDFS-14469:
------------------------------
After looking at the related code, we have found the following call stack:
{noformat}
BPServiceActor.run()
-> BPServiceActor.connectToNNAndHandshake()
-> BPOfferService.verifyAndSetNamespaceInfo()
-> DataNode.initBlockPool()
-> DataNode.initStorage()
-> FsDatasetFactory.newInstance()
-> FsDatasetImpl(){noformat}
If this call stack is valid, then IMHO we may have a minor issue:
Since {{BPServiceActor.run()}} retries all {{IOException}} from
{{BPServiceActor.connectToNNAndHandshake()}}, the {{DiskErrorException}} thrown
by {{FsDatasetImpl()}} will also be retried. However, since the exception is
thrown because of user's incorrect configuration, retrying here will not help.
> FsDatasetImpl() throws a DiskErrorException when the configuration has wrong
> values
> -----------------------------------------------------------------------------------
>
> Key: HDFS-14469
> URL: https://issues.apache.org/jira/browse/HDFS-14469
> Project: Hadoop HDFS
> Issue Type: Bug
> 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/fsdataset/impl/FsDatasetImpl.java
> Line: 294-297
> {code:java}
> throw new DiskErrorException("Invalid value configured for "
> + "dfs.datanode.failed.volumes.tolerated - " + volFailuresTolerated
> + ". Value configured is either less than maxVolumeFailureLimit or
> greater than "
> + "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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