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https://issues.apache.org/jira/browse/HDFS-8029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389186#comment-14389186
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Xiaoyu Yao commented on HDFS-8029:
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[~kanaka], thanks for reporting the issue. I tried your steps as shown below
but can't reproduce the issue.
Do you miss any repro step in the original description?
{code}
$ hdfs dfs -ls /
$ hdfs dfs -mkdir -p /test/sub1/sub2
$ hdfs dfs -copyFromLocal sh.tar /test/sub1/file1
$ hdfs dfs -copyFromLocal sh.tar /test/sub1/sub2/file1
$ hdfs dfsadmin -allowSnapshot /test/sub1
Allowing snaphot on /test/sub1 succeeded
$ hdfs dfs -createSnapshot /test/sub1 "s1"
Created snapshot /test/sub1/.snapshot/s1
$ hdfs dfs -rm -r /test/sub1/sub2
15/03/31 11:51:06 INFO fs.TrashPolicyDefault: Namenode trash configuration:
Deletion interval = 0 minutes, Emptier interval = 0 minutes.
Deleted /test/sub1/sub2
$ hdfs dfs -createSnapshot /test/sub1 "s2"
Created snapshot /test/sub1/.snapshot/s2
$ hadoop fs -du /test/
81920 81920 /test/sub1
{code}
> NPE during disk usage calculation on snapshot directory, after a sub folder
> is deleted
> --------------------------------------------------------------------------------------
>
> Key: HDFS-8029
> URL: https://issues.apache.org/jira/browse/HDFS-8029
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: kanaka kumar avvaru
> Assignee: kanaka kumar avvaru
>
> ContentSummary computation is causing NullPointerException on snapshot
> directory if some sub directory is deleted.
> Following are the steps to reproduce the issue.
>
> 1. Create a root directory "/test"
> 2. Create sub dir named as /test/sub1
> 3. Create sub dir in sub1 as /test/sub1/sub2
> 4. Create a file at /test/sub1/file1
> 5. Create a file at /test/sub1/sub2/file1
> 6. Enable shotshot on sub1 (hadoop dfsadmin -allowSnapshot test/sub1)
> 7. Create snapshot1 on /test/sub1
> 8. Delete directory /test/sub1/sub2 (recursively)
> 9. Create snapshot2 on /test/sub1
> 10. Execute du command on /test (hadoop fs -du /test/)
>
>
> Gives NullPointerException in CLI. NameNode logs the exception as
> ... java.lang.NullPointerException at
> org.apache.hadoop.hdfs.server.namenode.ContentSummaryComputationContext.getBlockStoragePolicySuite(ContentSummaryComputationContext.java:122)
> ...
>
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