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https://issues.apache.org/jira/browse/HDFS-15667?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hui Fei resolved HDFS-15667.
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Fix Version/s: 3.4.0
Target Version/s: (was: 3.3.1, 3.4.0)
Resolution: Fixed
> Audit log record the unexpected allowed result when delete called
> -----------------------------------------------------------------
>
> Key: HDFS-15667
> URL: https://issues.apache.org/jira/browse/HDFS-15667
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 3.2.1, 3.4.0
> Reporter: Baolong Mao
> Assignee: Baolong Mao
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Attachments: screenshot-1.png, screenshot-2.png
>
> Time Spent: 4h 50m
> Remaining Estimate: 0h
>
> I met this issue if rm root directory, for remove non-root and non-empty
> directory, toRemovedBlocks isn't null, its toDeleteList size is 0.
> !screenshot-1.png!
> when will return null?
> Through this screenshot, we can find that if fileRemoved = -1, then
> toRemovedBlocks = null
> !screenshot-2.png!
> And when deleteAllowed(iip) return false, fileRemoved can be -1,
> {code:java}
> private static boolean deleteAllowed(final INodesInPath iip) {
> if (iip.length() < 1 || iip.getLastINode() == null) {
> if (NameNode.stateChangeLog.isDebugEnabled()) {
> NameNode.stateChangeLog.debug(
> "DIR* FSDirectory.unprotectedDelete: failed to remove "
> + iip.getPath() + " because it does not exist");
> }
> return false;
> } else if (iip.length() == 1) { // src is the root
> NameNode.stateChangeLog.warn(
> "DIR* FSDirectory.unprotectedDelete: failed to remove " +
> iip.getPath() + " because the root is not allowed to be
> deleted");
> return false;
> }
> return true;
> }
> {code}
> Through the code of deleteAllowed, we can find that when src is the root, it
> can return false.
> So without this PR, when I execute *bin/hdfs dfs -rm -r /*
> I find the confusing auditlog line like following
> 2020-11-05 14:32:53,420 INFO FSNamesystem.audit
> (FSNamesystem.java:logAuditMessage(8102)) - allowed=true
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