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https://issues.apache.org/jira/browse/HBASE-22369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16833988#comment-16833988
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stack commented on HBASE-22369:
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Looking at it, it's fatal if CP can't create dir and we don't want the process
to start up; hence the RE.
> CoprocessorClassLoader.init() throws a RuntimeException when it fails to
> create a directory
> -------------------------------------------------------------------------------------------
>
> Key: HBASE-22369
> URL: https://issues.apache.org/jira/browse/HBASE-22369
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.1.4
> Reporter: eBugs
> Priority: Minor
>
> Dear HBase 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.
>
> Version: HBase-2.1.4
> File:
> HBASE-ROOT/hbase-common/src/java/org/apache/hbase/utils/CoprocessorClassLoader.java
> Line: 160-161
> {code:java}
> throw new RuntimeException("Failed to create local dir " + parentDirStr
> + ", CoprocessorClassLoader failed to init");{code}
>
> {{RuntimeException}} is usually used to represent errors in the program logic
> (think of one of its subclasses, {{NullPointerException}}), while the error
> message indicates that {{init()}} failed to create a directory. This mismatch
> could be a problem. For example, the callers may miss the case where
> {{init()}} fails to create a directory. Or, the callers trying to handle
> other {{RuntimeException}} may accidentally (and incorrectly) handle the
> directory creation failure.
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