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Posted to common-issues@hadoop.apache.org by "xiaoli (Jira)" <ji...@apache.org> on 2021/12/23 01:35:00 UTC
[jira] [Comment Edited] (HADOOP-15918) Namenode gets stuck when deleting large dir in trash
[ https://issues.apache.org/jira/browse/HADOOP-15918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17464204#comment-17464204 ]
xiaoli edited comment on HADOOP-15918 at 12/23/21, 1:34 AM:
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this issue has test report in production？ cc [~Tao Jie]
was (Author: xiaoli):
this issue has test report in production？ [~Tao Jie]
> 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: 2.8.2, 3.1.0
> Reporter: Tao Jie
> Assignee: Tao Jie
> Priority: Major
> Attachments: HADOOP-15918.001.patch, HADOOP-15918.002.patch, 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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