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https://issues.apache.org/jira/browse/HDFS-13723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16535441#comment-16535441
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Wei-Chiu Chuang commented on HDFS-13723:
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LGTM +1 pending Jenkins.
> Occasional "Should be different group" error in
> TestRefreshUserMappings#testGroupMappingRefresh
> -----------------------------------------------------------------------------------------------
>
> Key: HDFS-13723
> URL: https://issues.apache.org/jira/browse/HDFS-13723
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: security, test
> Affects Versions: 3.0.0
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
> Attachments: HDFS-13723.001.patch, HDFS-13723.002.patch,
> HDFS-13723.003.patch
>
>
> In some occasions, the user-group mapping refresh timeout test assertion
> would fail due to the mapping didn't refresh in time, reporting "Should be
> different group".
>
> Trace:
> {code:java}
> java.lang.AssertionError: Should be different group
> at
> org.apache.hadoop.security.TestRefreshUserMappings.testGroupMappingRefresh(TestRefreshUserMappings.java:153)
> :
> :
> 2018-07-04 19:35:21,073 [BP-1412052829-172.26.17.254-1530758120647
> heartbeating to localhost/127.0.0.1:39524] INFO datanode.DataNode
> (BPOfferService.java:processCommandFromActive(759)) - Got finalize command
> for block pool BP-1412052829-172.26.17.254-1530758120647
> Getting groups in MockUnixGroupsMapping
> 2018-07-04 19:35:21,090 [IPC Server handler 6 on 39524] INFO
> FSNamesystem.audit (FSNamesystem.java:logAuditMessage(7805)) - allowed=true
> ugi=jenkins (auth:SIMPLE) ip=/127.0.0.1 cmd=datanodeReport
> src=null dst=null perm=null proto=rpc
> 2018-07-04 19:35:21,092 [main] INFO hdfs.MiniDFSCluster
> (MiniDFSCluster.java:waitActive(2629)) - Cluster is active
> 2018-07-04 19:35:21,095 [IPC Server handler 7 on 39524] INFO
> FSNamesystem.audit (FSNamesystem.java:logAuditMessage(7805)) - allowed=true
> ugi=jenkins (auth:SIMPLE) ip=/127.0.0.1 cmd=datanodeReport
> src=null dst=null perm=null proto=rpc
> 2018-07-04 19:35:21,096 [main] INFO hdfs.MiniDFSCluster
> (MiniDFSCluster.java:waitActive(2629)) - Cluster is active
> first attempt:
> [jenkins11, jenkins12]
> second attempt, should be same:
> [jenkins11, jenkins12]
> 2018-07-04 19:35:21,101 [IPC Server handler 5 on 39524] INFO
> namenode.NameNode (NameNodeRpcServer.java:refreshUserToGroupsMappings(1648))
> - Refreshing all user-to-groups mappings. Requested by user: jenkins
> 2018-07-04 19:35:21,101 [IPC Server handler 5 on 39524] INFO security.Groups
> (Groups.java:refresh(401)) - clearing userToGroupsMap cache
> Refreshing groups in MockUnixGroupsMapping
> 2018-07-04 19:35:21,102 [IPC Server handler 5 on 39524] INFO
> FSNamesystem.audit (FSNamesystem.java:logAuditMessage(7805)) - allowed=true
> ugi=jenkins (auth:SIMPLE) ip=/127.0.0.1
> cmd=refreshUserToGroupsMappings src=null dst=null perm=null
> proto=rpc
> Refresh user to groups mapping successful
> third attempt(after refresh command), should be different:
> Getting groups in MockUnixGroupsMapping
> [jenkins21, jenkins22]
> fourth attempt(after timeout), should be different:
> [jenkins21, jenkins22]
> Getting groups in MockUnixGroupsMapping
> 2018-07-04 19:35:22,204 [main] INFO hdfs.MiniDFSCluster
> (MiniDFSCluster.java:shutdown(1965)) - Shutting down the Mini HDFS Cluster
> {code}
>
> Solution:
> Increase the timeout slightly, and place debugging message in load() and
> reload() methods in class GroupCacheLoader.
>
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