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https://issues.apache.org/jira/browse/HDFS-4845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13665860#comment-13665860
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Arpit Agarwal commented on HDFS-4845:
-------------------------------------
FSNameSystem.deleteInternal calls removeFromInodeMap without holding the FSDir
write lock. Verified by adding a Preconditions.checkState for the write lock in
removeFromInodeMap.
{code}
private boolean deleteInternal(String src, boolean recursive,
boolean enforcePermission)
throws AccessControlException, SafeModeException, UnresolvedLinkException,
IOException {
...
dir.removeFromInodeMap(removedINodes);
{code}
Looks like we just need to call dir.writeLock() prior to removeFromINodeMap.
> FSEditLogLoader gets NPE while accessing INodeMap in TestEditLogRace
> --------------------------------------------------------------------
>
> Key: HDFS-4845
> URL: https://issues.apache.org/jira/browse/HDFS-4845
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Kihwal Lee
> Assignee: Arpit Agarwal
> Priority: Critical
>
> TestEditLogRace fails occasionally because it gets NPE from manipulating
> INodeMap while loading edits.
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