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我想弄清楚爲什麼我的MR工作失敗。我有疑惑的是這個警告紗線ResourceManager的日誌：hadoop紗：未知的用戶和組
2015-08-14 12:00:45,610 INFO SecurityLogger.org.apache.hadoop.ipc.Server: Auth successful for testing (auth:SIMPLE)
2015-08-14 12:00:45,624 WARN org.apache.hadoop.security.ShellBasedUnixGroupsMapping: got exception trying to get groups for user testing: id: testing: No such user
2015-08-14 12:00:45,624 WARN org.apache.hadoop.security.UserGroupInformation: No groups available for user testing
2015-08-14 12:00:45,624 INFO SecurityLogger.org.apache.hadoop.security.authorize.ServiceAuthorizationManager: Authorization successful for testing (auth:TOKEN) for protocol=interface org.apache.hadoop.yarn.s
erver.nodemanager.api.LocalizationProtocolPB
我沒有用戶測試'的任何地方配置。另外，我在紗線，mapreduce或其他hadoop的子系統的默認配置中找不到它。
有誰知道這個用戶來自哪裏？