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https://issues.apache.org/jira/browse/HDFS-3061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268475#comment-13268475
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Kihwal Lee commented on HDFS-3061:
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Since HDFS-1487 is closed, I will track the work in this jira.
> Cached directory size in INodeDirectory can get permantently out of sync with
> computed size, causing quota issues
> -----------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-3061
> URL: https://issues.apache.org/jira/browse/HDFS-3061
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.20.203.0, 0.23.0, 1.0.2
> Environment: 0.20.203 with HDFS-1377 and HDFS-2053 patches applied
> Reporter: Alex Holmes
> Assignee: Kihwal Lee
> Priority: Blocker
> Fix For: 1.1.0, 0.23.3, 1.0.3, 2.0.0, 3.0.0
>
> Attachments: QuotaTestSimple.java
>
>
> It appears that there's a condition under which a HDFS directory with a space
> quota set can get to a point where the cached size for the directory can
> permanently differ from the computed value. When this happens the following
> command:
> {code}
> hadoop fs -count -q /tmp/quota-test
> {code}
> results in the following output in the NameNode logs:
> {code}
> WARN org.apache.hadoop.hdfs.server.namenode.NameNode: Inconsistent diskspace
> for directory quota-test. Cached: 6000 Computed: 6072
> {code}
> I've observed both transient and persistent instances of this happening. In
> the transient instances this warning goes away, but in the persistent
> instances every invocation of the {{fs -count -q}} command yields the above
> warning.
> I've seen instances where the actual disk usage of a directory is 25% of the
> cached value in INodeDirectory, which creates problems since the quota code
> uses this cached value to determine whether block write requests are
> permitted.
> This isn't easy to reproduce - I am able to (inconsistently) get HDFS into
> this state with a simple program which:
> # Writes files into HDFS
> # When a DSQuotaExceededException is encountered removes all files created
> in step 1
> # Repeat step 1
> I'm going to try and come up with a more repeatable test case to reproduce
> this issue.
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