An error log:
The 2017-03-24 22:42:27, 496 WARN org. Apache. Hadoop. Security. ShellBasedUnixGroupsMapping: unable to return groups for user I? Plus or minus
PartialGroupNameException The user name 'I? + 'is not found. Id: I? Mm: No to user
Id: I? Mm: No to user
At org, apache hadoop. Security. ShellBasedUnixGroupsMapping. ResolvePartialGroupNames (ShellBasedUnixGroupsMapping. Java: 212)
At org, apache hadoop. Security. ShellBasedUnixGroupsMapping. GetUnixGroups (ShellBasedUnixGroupsMapping. Java: 133)
At org, apache hadoop. Security. ShellBasedUnixGroupsMapping. GetGroups (ShellBasedUnixGroupsMapping. Java: 72)
At org, apache hadoop. Security. JniBasedUnixGroupsMappingWithFallback. GetGroups (JniBasedUnixGroupsMappingWithFallback. Java: 51)
At org, apache hadoop. Security. Groups $GroupCacheLoader. FetchGroupList (239) Groups. Java:
At org, apache hadoop. Security. $GroupCacheLoader Groups. The load (220) Groups. Java:
At org, apache hadoop. Security. $GroupCacheLoader Groups. The load (208) Groups. Java:
At com.google.com, mon. Cache. LocalCache $LoadingValueReference. LoadFuture (LocalCache. Java: 3568)
At com.google.com, mon. Cache. LocalCache $Segment. LoadSync (LocalCache. Java: 2350)
At com.google.com, mon. Cache. LocalCache $Segment. LockedGetOrLoad (LocalCache. Java: 2313)
At com.google.com, mon. Cache. LocalCache $Segment. Get (LocalCache. Java: 2228)
At com.google.com, mon. Cache. LocalCache. Get (LocalCache. Java: 3965)
At com.google.com, mon. Cache. LocalCache. GetOrLoad (LocalCache. Java: 3969)
At com.google.com, mon. Cache. LocalCache $LocalManualCache. Get (LocalCache. Java: 4829)
At org, apache hadoop. Security. Groups. GetGroups (182) Groups. Java:
At org, apache hadoop. Security. UserGroupInformation. GetGroupNames (UserGroupInformation. Java: 1553)
At org, apache hadoop. HDFS. Server. The namenode. FSPermissionChecker. & lt; init> (FSPermissionChecker. Java: 66)
At org, apache hadoop. HDFS. Server. The namenode. FSNamesystem. GetPermissionChecker (FSNamesystem. Java: 4013)
At org, apache hadoop. HDFS. Server. The namenode. FSNamesystem. GetFileInfo (FSNamesystem. Java: 4207)
At org, apache hadoop. HDFS. Server. The namenode. NameNodeRpcServer. GetFileInfo (NameNodeRpcServer. Java: 895)
At org, apache hadoop. HDFS. Server. The namenode. AuthorizationProviderProxyClientProtocol. GetFileInfo (AuthorizationProviderProxyClientProtocol. Java: 527)
At org, apache hadoop. HDFS. ProtocolPB. ClientNamenodeProtocolServerSideTranslatorPB. GetFileInfo (ClientNamenodeProtocolServerSideTranslatorPB. Java: 824)
At org, apache hadoop. HDFS. Protocol. The proto. ClientNamenodeProtocolProtos $ClientNamenodeProtocol $2. CallBlockingMethod (ClientNamenodeProtocolProtos. Java)
At org, apache hadoop. Ipc. ProtobufRpcEngine $$ProtoBufRpcInvoker Server. Call (617) ProtobufRpcEngine. Java:
At org, apache hadoop. Ipc. RPC $Server. The call (RPC) Java: 1073)
At org, apache hadoop. Ipc. Server $Handler $1. The run (2086) Server. Java:
At org, apache hadoop. Ipc. Server $Handler $1. The run (2082) Server. Java:
The at Java. Security. The AccessController. DoPrivileged (Native Method)
At javax.mail. Security. Auth. Subject. The doAs (422) Subject. Java:
At org, apache hadoop. Security. UserGroupInformation. DoAs (UserGroupInformation. Java: 1693)
At org, apache hadoop. Ipc. Server $Handler. The run (2080) Server. Java: