eBugs in Cloud Systems created HDFS-14470:
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Summary: 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: Bug
Reporter: eBugs in Cloud Systems
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 seem to indicate different error conditions.
Since we are not very familiar with HDFS's internal work flow, could you please
help us verify if this is a bug, i.e., will the callers have trouble handling
the exception, and will the users/admins have trouble diagnosing the failure?
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}
Reason: 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). Will this mismatch be a
problem? For example, will the callers try to handle other
{{DiskErrorException}} accidentally (and incorrectly) handle the configuration
error?
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