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https://issues.apache.org/jira/browse/HIVE-25277?focusedWorklogId=614615&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-614615
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ASF GitHub Bot logged work on HIVE-25277:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 24/Jun/21 16:51
            Start Date: 24/Jun/21 16:51
    Worklog Time Spent: 10m 
      Work Description: coufon commented on a change in pull request #2421:
URL: https://github.com/apache/hive/pull/2421#discussion_r658120606



##########
File path: 
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HMSHandler.java
##########
@@ -5088,10 +5089,8 @@ private boolean isDatabaseRemote(String name) {
 
   private void deleteParentRecursive(Path parent, int depth, boolean 
mustPurge, boolean needRecycle)

Review comment:
       I think it works if deleteDir fails without side effect when the dir is 
non-empty. But we need to make sure all filesystems that Hive supports work in 
this way. Also I noticed that deleteDir calls moveToTrash first, so it could be 
more complex: 
https://github.com/apache/hive/blob/f2de30ca8bc2b63887496775f9a0769057a17ee0/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStoreFsImpl.java#L41.
 Avoiding duplicated checks seems to be safer.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 614615)
    Time Spent: 1h  (was: 50m)

> Slow Hive partition deletion for Cloud object stores with expensive ListFiles
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-25277
>                 URL: https://issues.apache.org/jira/browse/HIVE-25277
>             Project: Hive
>          Issue Type: Improvement
>          Components: Standalone Metastore
>    Affects Versions: All Versions
>            Reporter: Zhou Fang
>            Assignee: Zhou Fang
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> Deleting a Hive partition is slow when use a Cloud object store as the 
> warehouse for which ListFiles is expensive. A root cause is that the 
> recursive parent dir deletion is very inefficient: there are many duplicated 
> calls to isEmpty (ListFiles is called at the end). This fix sorts the parents 
> to delete according to the path size, and always processes the longest one 
> (e.g., a/b/c is always before a/b). As a result, each parent path is only 
> needed to be checked once.



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