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From "Tao Jie (JIRA)" <j...@apache.org>
Subject [jira] [Moved] (HADOOP-15918) Namenode gets stuck when deleting large dir in trash
Date Fri, 09 Nov 2018 08:35:01 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tao Jie moved HDFS-13769 to HADOOP-15918:
-----------------------------------------

    Affects Version/s:     (was: 3.1.0)
                           (was: 2.8.2)
                       2.8.2
                       3.1.0
                  Key: HADOOP-15918  (was: HDFS-13769)
              Project: Hadoop Common  (was: Hadoop HDFS)

> Namenode gets stuck when deleting large dir in trash
> ----------------------------------------------------
>
>                 Key: HADOOP-15918
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15918
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 3.1.0, 2.8.2
>            Reporter: Tao Jie
>            Assignee: Tao Jie
>            Priority: Major
>         Attachments: HDFS-13769.001.patch, HDFS-13769.002.patch, HDFS-13769.003.patch,
HDFS-13769.004.patch
>
>
> Similar to the situation discussed in HDFS-13671, Namenode gets stuck for a long time
when deleting trash dir with a large mount of data. We found log in namenode:
> {quote}
> 2018-06-08 20:00:59,042 INFO namenode.FSNamesystem (FSNamesystemLock.java:writeUnlock(252))
- FSNamesystem write lock held for 23018 ms via
> java.lang.Thread.getStackTrace(Thread.java:1552)
> org.apache.hadoop.util.StringUtils.getStackTrace(StringUtils.java:1033)
> org.apache.hadoop.hdfs.server.namenode.FSNamesystemLock.writeUnlock(FSNamesystemLock.java:254)
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.writeUnlock(FSNamesystem.java:1567)
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:2820)
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.delete(NameNodeRpcServer.java:1047)
> {quote}
> One simple solution is to avoid deleting large data in one delete RPC call. We implement
a trashPolicy that divide the delete operation into several delete RPCs, and each single deletion
would not delete too many files.
> Any thought? [~linyiqun]



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