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因HIVE元數(shù)據(jù)與HDFS上的數(shù)據(jù)不一致引起的問(wèn)題修復(fù)

作者： IT明哥
大數(shù)據(jù)
本片博文是“大數(shù)據(jù)問(wèn)題排查系列”之一，講述某HIVE SQL 作業(yè)因?yàn)?HIVE 中的元數(shù)據(jù)與 HDFS中實(shí)際的數(shù)據(jù)不一致引起的一個(gè)問(wèn)題的排查和修復(fù)。

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本文轉(zhuǎn)載自微信公眾號(hào)「明哥的IT隨筆」，作者IT明哥。轉(zhuǎn)載本文請(qǐng)聯(lián)系明哥的IT隨筆公眾號(hào)。

前言

大家好，我是明哥!

本片博文是“大數(shù)據(jù)問(wèn)題排查系列”之一，講述某HIVE SQL 作業(yè)因?yàn)?HIVE 中的元數(shù)據(jù)與 HDFS中實(shí)際的數(shù)據(jù)不一致引起的一個(gè)問(wèn)題的排查和修復(fù)。

以下是正文。

問(wèn)題現(xiàn)象

客戶端報(bào)錯(cuò)如下：

  1. Unable to move source xxx to destination xxx 

客戶端報(bào)錯(cuò)

問(wèn)題分析

客戶端的報(bào)錯(cuò)信息，并沒(méi)有完全展現(xiàn)問(wèn)題背后的全貌。我們進(jìn)入 hiveserver2 所在節(jié)點(diǎn)查看hiveserver2的日志，可以看到如下相關(guān)信息：

  1. 2021-09-01 11:47:46,795 INFO  org.apache.hadoop.hive.ql.exec.Task: [HiveServer2-Background-Pool: Thread-1105]: Loading data to table hs_ods.ods_ses_acct_assure_scale partition (part_date=20210118) from hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/.hive-staging_hive_2021-09-01_11-47-31_216_694180642957006705-35/-ext-10000 
  2. 2021-09-01 11:47:46,795 INFO  hive.metastore: [HiveServer2-Background-Pool: Thread-1105]: HMS client filtering is enabled. 
  3. 2021-09-01 11:47:46,795 INFO  hive.metastore: [HiveServer2-Background-Pool: Thread-1105]: Trying to connect to metastore with URI thrift://hs01:9083 
  4. 2021-09-01 11:47:46,795 INFO  hive.metastore: [HiveServer2-Background-Pool: Thread-1105]: Opened a connection to metastore, current connections: 54 
  5. 2021-09-01 11:47:46,796 INFO  hive.metastore: [HiveServer2-Background-Pool: Thread-1105]: Connected to metastore. 
  6. 2021-09-01 11:47:46,928 INFO  org.apache.hadoop.hive.ql.exec.MoveTask: [HiveServer2-Background-Pool: Thread-1105]: Partition is: {part_date=20210118} 
  7. 2021-09-01 11:47:46,945 INFO  org.apache.hadoop.hive.common.FileUtils: [HiveServer2-Background-Pool: Thread-1105]: Creating directory if it doesn't exist: hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118 
  8. 2021-09-01 11:47:46,947 ERROR hive.ql.metadata.Hive: [HiveServer2-Background-Pool: Thread-1105]: Failed to move: {} 
  9. 2021-09-01 11:47:46,947 ERROR org.apache.hadoop.hive.ql.Driver: [HiveServer2-Background-Pool: Thread-1105]: FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.MoveTask. Unable to move source hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/.hive-staging_hive_2021-09-01_11-47-31_216_694180642957006705-35/-ext-10000 to destination hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118 
  10. 2021-09-01 11:47:46,948 INFO  org.apache.hadoop.hive.ql.Driver: [HiveServer2-Background-Pool: Thread-1105]: Completed executing command(queryId=hive_20210901114731_d7a78302-fb2a-4b45-9472-db6a9787f710); Time taken: 15.489 seconds 
  11. 2021-09-01 11:47:46,957 ERROR org.apache.hive.service.cli.operation.Operation: [HiveServer2-Background-Pool: Thread-1105]: Error running hive query:  
  12. org.apache.hive.service.cli.HiveSQLException: Error while processing statement: FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.MoveTask. Unable to move source hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/.hive-staging_hive_2021-09-01_11-47-31_216_694180642957006705-35/-ext-10000 to destination hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118 
  13.     at org.apache.hive.service.cli.operation.Operation.toSQLException(Operation.java:329) ~[hive-service-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  14.     at org.apache.hive.service.cli.operation.SQLOperation.runQuery(SQLOperation.java:258) ~[hive-service-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  15.     at org.apache.hive.service.cli.operation.SQLOperation.access$600(SQLOperation.java:92) ~[hive-service-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  16.     at org.apache.hive.service.cli.operation.SQLOperation$BackgroundWork$1.run(SQLOperation.java:345) [hive-service-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  17.     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_271] 
  18.     at javax.security.auth.Subject.doAs(Subject.java:422) [?:1.8.0_271] 
  19.     at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1875) [hadoop-common-3.0.0-cdh6.3.2.jar:?] 
  20.     at org.apache.hive.service.cli.operation.SQLOperation$BackgroundWork.run(SQLOperation.java:357) [hive-service-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  21.     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_271] 
  22.     at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_271] 
  23.     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_271] 
  24.     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_271] 
  25.     at java.lang.Thread.run(Thread.java:748) [?:1.8.0_271] 
  26. Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to move source hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/.hive-staging_hive_2021-09-01_11-47-31_216_694180642957006705-35/-ext-10000 to destination hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118 
  27.     at org.apache.hadoop.hive.ql.metadata.Hive.getHiveException(Hive.java:3449) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  28.     at org.apache.hadoop.hive.ql.metadata.Hive.getHiveException(Hive.java:3405) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  29.     at org.apache.hadoop.hive.ql.metadata.Hive.moveFile(Hive.java:3400) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  30.     at org.apache.hadoop.hive.ql.metadata.Hive.replaceFiles(Hive.java:3697) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  31.     at org.apache.hadoop.hive.ql.metadata.Hive.loadPartitionInternal(Hive.java:1614) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  32.     at org.apache.hadoop.hive.ql.metadata.Hive.loadPartition(Hive.java:1525) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  33.     at org.apache.hadoop.hive.ql.metadata.Hive.loadPartition(Hive.java:1489) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  34.     at org.apache.hadoop.hive.ql.exec.MoveTask.execute(MoveTask.java:501) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  35.     at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:199) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  36.     at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:97) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  37.     at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:2200) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  38.     at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1843) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  39.     at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1563) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  40.     at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1339) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  41.     at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1334) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  42.     at org.apache.hive.service.cli.operation.SQLOperation.runQuery(SQLOperation.java:256) ~[hive-service-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  43.     ... 11 more 
  44. Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to move source hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/.hive-staging_hive_2021-09-01_11-47-31_216_694180642957006705-35/-ext-10000/000000_0 to destination hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/000000_0 
  45.     at org.apache.hadoop.hive.ql.metadata.Hive.handlePoolException(Hive.java:3422) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  46.     at org.apache.hadoop.hive.ql.metadata.Hive.moveFile(Hive.java:3367) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  47.     at org.apache.hadoop.hive.ql.metadata.Hive.replaceFiles(Hive.java:3697) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  48.     at org.apache.hadoop.hive.ql.metadata.Hive.loadPartitionInternal(Hive.java:1614) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  49.     at org.apache.hadoop.hive.ql.metadata.Hive.loadPartition(Hive.java:1525) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  50.     at org.apache.hadoop.hive.ql.metadata.Hive.loadPartition(Hive.java:1489) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  51.     at org.apache.hadoop.hive.ql.exec.MoveTask.execute(MoveTask.java:501) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  52.     at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:199) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  53.     at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:97) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  54.     at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:2200) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  55.     at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1843) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  56.     at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1563) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  57.     at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1339) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  58.     at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1334) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  59.     at org.apache.hive.service.cli.operation.SQLOperation.runQuery(SQLOperation.java:256) ~[hive-service-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  60.     ... 11 more 
  61. Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to move source hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/.hive-staging_hive_2021-09-01_11-47-31_216_694180642957006705-35/-ext-10000/000000_0 to destination hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/000000_0 
  62.     at org.apache.hadoop.hive.ql.metadata.Hive.getHiveException(Hive.java:3449) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  63.     at org.apache.hadoop.hive.ql.metadata.Hive.getHiveException(Hive.java:3405) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  64.     at org.apache.hadoop.hive.ql.metadata.Hive.access$200(Hive.java:175) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  65.     at org.apache.hadoop.hive.ql.metadata.Hive$3.call(Hive.java:3350) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  66.     at org.apache.hadoop.hive.ql.metadata.Hive$3.call(Hive.java:3335) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  67.     ... 4 more 
  68. Caused by: java.io.IOException: rename for src path: hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/.hive-staging_hive_2021-09-01_11-47-31_216_694180642957006705-35/-ext-10000/000000_0 to dest path:hdfs://hs01:8020/user/hundsun/dap/hive/hs_ods/ods_ses_acct_assure_scale/part_date=20210118/000000_0 returned false 
  69.     at org.apache.hadoop.hive.ql.metadata.Hive$3.call(Hive.java:3347) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  70.     at org.apache.hadoop.hive.ql.metadata.Hive$3.call(Hive.java:3335) ~[hive-exec-2.1.1-cdh6.3.2.jar:2.1.1-cdh6.3.2] 
  71.     ... 4 more 
  72. 2021-09-01 11:47:46,962 INFO  org.apache.hadoop.hive.conf.HiveConf: [HiveServer2-Handler-Pool: Thread-474]: Using the default value passed in for log id: d9b4646b-3c22-4589-8912-a68b92efcca7 
  73. 2021-09-01 11:47:46,962 INFO  org.apache.hadoop.hive.ql.session.SessionState: [HiveServer2-Handler-Pool: Thread-474]: Updating thread name to d9b4646b-3c22-4589-8912-a68b92efcca7 HiveServer2-Handler-Pool: Thread-474 
  74. 2021-09-01 11:47:46,962 INFO  org.apache.hive.service.cli.operation.OperationManager: [d9b4646b-3c22-4589-8912-a68b92efcca7 HiveServer2-Handler-Pool: Thread-474]: Closing operation: OperationHandle [opType=EXECUTE_STATEMENT, getHandleIdentifier()=29e01dfe-8b9b-427a-a610-1d58c526faca] 
  75. 2021-09-01 11:47:46,973 INFO  org.apache.hadoop.hive.conf.HiveConf: [d9b4646b-3c22-4589-8912-a68b92efcca7 HiveServer2-Handler-Pool: Thread-474]: Using the default value passed in for log id: d9b4646b-3c22-4589-8912-a68b92efcca7 
  76. 2021-09-01 11:47:46,973 INFO  org.apache.hadoop.hive.ql.session.SessionState: [d9b4646b-3c22-4589-8912-a68b92efcca7 HiveServer2-Handler-Pool: Thread-474]: Resetting thread name to  HiveServer2-Handler-Pool: Thread-474 
  77. 2021-09-01 11:47:47,025 INFO  org.apache.hive.service.cli.thrift.ThriftCLIService: [HiveServer2-Handler-Pool: Thread-474]: Session disconnected without closing properly.  
  78. 2021-09-01 11:47:47,025 INFO  org.apache.hive.service.cli.thrift.ThriftCLIService: [HiveServer2-Handler-Pool: Thread-474]: Closing the session: SessionHandle [d9b4646b-3c22-4589-8912-a68b92efcca7] 
  79. 2021-09-01 11:47:47,025 INFO  org.apache.hive.service.CompositeService: [HiveServer2-Handler-Pool: Thread-474]: Session closed, SessionHandle [d9b4646b-3c22-4589-8912-a68b92efcca7], current sessions:0 

從以上信息可以看到，hivesql 使用的是spark執(zhí)行引擎，且 spark 作業(yè)已經(jīng)執(zhí)行成功了，但是在hiveser2做收尾工作時(shí)，移動(dòng)臨時(shí)文件到目標(biāo)目錄下時(shí)報(bào)錯(cuò)了，最底層的報(bào)錯(cuò)信息是 rename for src path xxx to dest path xxx returned false.

順藤摸瓜，接下來(lái)去 hdfs 上查看問(wèn)題。通過(guò) hdfs dfs -ls 發(fā)現(xiàn) hdfs上目標(biāo)文件已經(jīng)存在了，且通過(guò)時(shí)間信息可以發(fā)現(xiàn)該文件是幾天前創(chuàng)建的，跟當(dāng)前sql作業(yè)的執(zhí)行沒(méi)有關(guān)系：

hdfs-destination-path

問(wèn)題原因

通過(guò)上述排查分析，問(wèn)題直接原因已經(jīng)清晰：hive sql 底層的spark作業(yè)已經(jīng)執(zhí)行成功，對(duì)應(yīng)的數(shù)據(jù)已經(jīng)計(jì)算完畢，但在移動(dòng)臨時(shí)結(jié)果文件到最終目標(biāo)目錄時(shí)，因?yàn)閔dfs上最終目標(biāo)目錄已經(jīng)存在且目標(biāo)目錄下存在同名文件，rename操作無(wú)法完成，作業(yè)執(zhí)行失敗。

回頭看下我們的 sql,其本質(zhì)就是個(gè)對(duì)分區(qū)表某個(gè)分區(qū)的 insert overwrite, 照道理來(lái)說(shuō)，應(yīng)該會(huì)覆蓋目標(biāo)分區(qū)對(duì)應(yīng)的目錄下的數(shù)據(jù)文件(即先刪除舊的數(shù)據(jù)文件，再創(chuàng)建新數(shù)據(jù)文件)，但為什么這里沒(méi)有執(zhí)行刪除動(dòng)作呢?

這其實(shí)是因?yàn)樵摲謪^(qū)表在 HIVE 中的元數(shù)據(jù)與 HDFS 中的數(shù)據(jù)不一致。通過(guò) show create table 和 show partitions 可以發(fā)現(xiàn)，在HIVE元數(shù)據(jù)中該分區(qū)表只有一個(gè)分區(qū)，但HDFS上存在該表其它分區(qū)對(duì)應(yīng)的目錄和文件：

show create table

show partitions

所以問(wèn)題的根本原因是：該分區(qū)表在 HIVE中的元數(shù)據(jù)與HDFS上實(shí)際的數(shù)據(jù)不一致，當(dāng)執(zhí)行 insert overwrite 操作時(shí)，hive 通過(guò)存儲(chǔ)在 metastore 中的元數(shù)據(jù)信息發(fā)現(xiàn)目標(biāo)分區(qū)并不存在，也就不會(huì)嘗試去執(zhí)行hdfs上該分區(qū)對(duì)應(yīng)目錄的刪除操作了，而實(shí)際上hdfs上該分區(qū)對(duì)應(yīng)的目錄和文件都是存在的，所以作業(yè)底層的 rename 操作失敗了。

問(wèn)題解決

知道了問(wèn)題的直接原因和根本原因，解決方法也就順理成章了：修復(fù) hive 元數(shù)據(jù)跟hdfs實(shí)際的數(shù)據(jù)一致即可。

可以使用命令 msck repair table xxx來(lái)修復(fù)hive表的元數(shù)據(jù)：

元數(shù)據(jù)修復(fù)完畢，通過(guò)show partitions xx 發(fā)現(xiàn)，hive中已經(jīng)可以查到原來(lái)遺失的分區(qū)。然后重新執(zhí)行上述 insert overwrite 語(yǔ)句，作業(yè)成功執(zhí)行。

問(wèn)題總結(jié)

  • 當(dāng) HIVE 中的元數(shù)據(jù)與 HDFS 上實(shí)際的數(shù)據(jù)不一致時(shí)，一些正常的 HIVE SQL 操作可能會(huì)執(zhí)行失敗。
  • HIVE 中的元數(shù)據(jù)與 HDFS 上實(shí)際的數(shù)據(jù)不一致的原因有很多，常見(jiàn)的有：
    • 使用了 HIVE 外表，由于外表的特性，在HIVE 中刪除外表或外表的某些分區(qū)時(shí), HDFS上對(duì)應(yīng)的目錄和文件仍會(huì)存在，此時(shí)就會(huì)造成不一致;(我們這里就是這種情況)
    • HIVE 的元數(shù)據(jù)和底層HDFS的數(shù)據(jù)是從其他集群同步過(guò)來(lái)的，但同步過(guò)程中有問(wèn)題，比如時(shí)間沒(méi)對(duì)齊狀態(tài)不一致;(跨集群同步處理不善，會(huì)有這種情況)
    • HIVE中的元數(shù)據(jù)或HDFS上的數(shù)據(jù)有損壞和丟失。(集群運(yùn)維管理不規(guī)范，會(huì)造成這種現(xiàn)象) 
  • 可以通過(guò) msck repair table xxx 來(lái)修復(fù) hive表的元數(shù)據(jù): MSCK [REPAIR] TABLE table_name [ADD/DROP/SYNC PARTITIONS];

 

責(zé)任編輯：武曉燕 來(lái)源： 明哥的IT隨筆
HDFSHIVE元數(shù)據(jù)
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