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https://issues.apache.org/jira/browse/HADOOP-12252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636506#comment-14636506
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zhihai xu commented on HADOOP-12252:
------------------------------------
Thanks [~brahmareddy] for the information, I looked at HADOOP-8437. They looks
like two different issues.
This NPE happened here is because the newLocalDirs with empty string
configuration is equals to the initial value savedLocalDirs.
{code}
private String savedLocalDirs = "";
{code}
So {{localDirs}} is not updated. the initial value of {{localDirs}} is null,
which cause NPE at {{int numDirs = localDirs.length;}}
This NPE issue is caused by NULL initial value of {{localDirs}}.
For HADOOP-8437, the problem is due to failing to create the path or
DiskErrorException, which cause zero size directory list.
> LocalDirAllocator should not throw NPE with empty string configuration.
> ------------------------------------------------------------------------
>
> Key: HADOOP-12252
> URL: https://issues.apache.org/jira/browse/HADOOP-12252
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: zhihai xu
> Assignee: zhihai xu
> Attachments: HADOOP-12252.000.patch
>
>
> LocalDirAllocator should not throw NPE with empty string configuration. When
> an empty string is configured, {{LocalDirAllocator}} will throw NPE. It will
> be better to throw IOException instead of NPE.
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