Tao Jie created HDFS-13769:
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Summary: Namenode gets stuck when deleting large dir in trash
Key: HDFS-13769
URL: https://issues.apache.org/jira/browse/HDFS-13769
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 3.1.0, 2.8.2
Reporter: Tao Jie
Assignee: Tao Jie
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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