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https://issues.apache.org/jira/browse/HADOOP-20066?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HADOOP-20066:
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Labels: pull-request-available (was: )
> LocalDirAllocator throws ArithmeticException instead of DiskErrorException
> when every directory with free space fails the write check
> -------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-20066
> URL: https://issues.apache.org/jira/browse/HADOOP-20066
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Reporter: Yang Jie
> Priority: Minor
> Labels: pull-request-available
>
> When the size is unknown, AllocatorPerContext#getLocalPathForWrite picks a
> directory at random, weighted by its free space. If the chosen directory
> fails createPath(), its space is subtracted from {{totalAvailable}} and it
> counts as searched. A directory with no usable space still counts toward
> {{numDirs}}, so after every directory with space has failed,
> {{totalAvailable}} is 0 while {{numDirsSearched < numDirs}} still holds, and
> the next {{(r.nextLong() >>> 1) % totalAvailable}} throws
> "ArithmeticException: / by zero".
> This needs two or more directories, at least one with no usable space, and
> every directory with space failing createPath(), for example a disk remounted
> read-only. The allocator only rebuilds its context when the configuration
> changes, so in a task or client JVM every such allocation fails from then on.
> Callers expect a DiskErrorException, which is an IOException; they get an
> unchecked exception instead, without the message that lists the directories.
> The fix stops the loop once no space is left, so the existing
> DiskErrorException is thrown. HADOOP-9079 reported this case in 2012 with the
> same change, but it was never committed.
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