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據我們所知，FIWARE實驗室中的每個Cosmos用戶（cosmos.lab.fiware.org）在HDFS中的最大可用空間爲5GB。
儘管作業生成的數據不超過5GB配額，但在運行map-reduce Hadoop作業時，我們仍得到DSQuotaExceededException。Cosmos中的用戶HDFS配額管理
如果我們監視的執行過程中，HDFS使用地圖，減少工作中，我們得到以下的輸出：
16/07/28 19:03:11 INFO mapred.JobClient: Task Id : attempt_201604111313_157784_r_000006_0, Status : FAILED
org.apache.hadoop.hdfs.protocol.DSQuotaExceededException: org.apache.hadoop.hdfs.protocol.DSQuotaExceededException: The DiskSpace quota of /user/rbarriuso is exceeded: quota=5368709120 diskspace consumed=5.0g
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:95)
at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:57)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3778)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3640)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2400(DFSClient.java:2846)
at org.apache.ha...
：
Command: "while true; do date; hadoop fs -count -q . ; sleep 20; done"
Format:
DATE
QUOTA REMAINING_QUOTA SPACE_QUOTA REMAINING_SPACE_QUOTA DIR_COUNT FILE_COUNT CONTENT_SIZE FILE_NAME
jue jul 28 18:50:12 CEST 2016
none inf 5368709120 1197734302 19 46 1389627219 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:50:34 CEST 2016
none inf 5368709120 2678747494 16 26 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:50:57 CEST 2016
none inf 5368709120 2678747494 16 26 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:51:20 CEST 2016
none inf 5368709120 2678747494 16 26 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:51:44 CEST 2016
none inf 5368709120 2678747494 16 26 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:52:07 CEST 2016
none inf 5368709120 2678747494 16 26 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:52:28 CEST 2016
none inf 5368709120 1198032544 22 35 1389528792 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:52:50 CEST 2016
none inf 5368709120 1197738517 19 39 1389625814 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:53:11 CEST 2016
none inf 5368709120 2678747494 16 27 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:53:35 CEST 2016
none inf 5368709120 2678747494 16 27 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:53:59 CEST 2016
none inf 5368709120 2678747494 16 27 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:54:22 CEST 2016
none inf 5368709120 2678747494 16 27 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:54:46 CEST 2016
none inf 5368709120 2678747494 16 27 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:55:09 CEST 2016
none inf 5368709120 2477420902 17 28 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:55:31 CEST 2016
none inf 5368709120 1197738514 19 39 1389625815 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:55:55 CEST 2016
none inf 5368709120 1197738514 20 48 1389625815 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:56:17 CEST 2016
none inf 5368709120 2678747506 16 28 895957138 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:56:40 CEST 2016
none inf 5368709120 2678747506 16 28 895957138 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:57:04 CEST 2016
none inf 5368709120 2678747506 16 28 895957138 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:57:28 CEST 2016
none inf 5368709120 2678747506 16 28 895957138 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:57:51 CEST 2016
none inf 5368709120 2678747506 16 28 895957138 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:58:13 CEST 2016
none inf 5368709120 1198032556 16 37 1389528788 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:58:34 CEST 2016
none inf 5368709120 1197738742 19 40 1389625760 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:58:56 CEST 2016
none inf 5368709120 2678747494 16 29 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:59:20 CEST 2016
none inf 5368709120 2678747494 16 29 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 18:59:43 CEST 2016
none inf 5368709120 2678747494 16 29 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:00:07 CEST 2016
none inf 5368709120 2678747494 16 29 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:00:31 CEST 2016
none inf 5368709120 2678747494 16 29 895957142 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:00:54 CEST 2016
none inf 5368709120 1076586601 22 38 1228684181 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:01:18 CEST 2016
none inf 5368709120 1197724648 19 41 1389630437 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:01:41 CEST 2016
none inf 5368709120 1197724648 19 41 1389630437 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:02:05 CEST 2016
none inf 5368709120 1197724648 19 41 1389630437 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:02:29 CEST 2016
none inf 5368709120 1197724648 19 41 1389630437 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:02:53 CEST 2016
none inf 5368709120 1197724648 19 41 1389630437 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:03:14 CEST 2016
none inf 5368709120 364004107 19 46 1667537284 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:03:36 CEST 2016
none inf 5368709120 197959591 20 48 1722885456 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:03:57 CEST 2016
none inf 5368709120 201060881 18 44 1722549413 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:04:19 CEST 2016
none inf 5368709120 201060881 18 44 1722549413 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:04:40 CEST 2016
none inf 5368709120 201060881 18 44 1722549413 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:05:02 CEST 2016
none inf 5368709120 201060881 18 44 1722549413 hdfs://cosmosmaster-gi/user/rbarriuso
jue jul 28 19:05:23 CEST 2016
none inf 5368709120 201060881 18 44 1722549413 hdfs://cosmosmaster-gi/user/rbarriuso
過了一會，執行與此異常結束正如您在上面的日誌末尾所看到的那樣，HDFS的最大使用量對應於1.722.549.413字節和201.060.881字節的免費配額（根據hadoop fs -count -q），該值不會將可用用戶空間的5GB相加。
此外，佔用的空間與剩餘的空閒空間不匹配。
剩餘配額空間是如何計算的？
有什麼辦法可以避免DSQuotaExceededException？
在此先感謝。