Hadoop Can'；使用Sqoop将数据从HDFS传输到MYSQL时，不能完成MR

将数据从HDFS传输到MySQL时，会生成MapReduce作业。但是，它被卡住了，无法完成

sqoop export --connect jdbc:mysql://crxy2:3306/test --username root --password 19911130 --table info --export-dir sqoop_export

我在日志中看到以下内容：

Warning: /software/sqoop-1.4.6.alpha/../hbase does not exist! HBase imports will fail.
Please set $HBASE_HOME to the root of your HBase installation.
Warning: /software/sqoop-1.4.6.alpha/../hcatalog does not exist! HCatalog jobs will fail.
Please set $HCAT_HOME to the root of your HCatalog installation.
Warning: /software/sqoop-1.4.6.alpha/../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
Warning: /software/sqoop-1.4.6.alpha/../zookeeper does not exist! Accumulo imports will fail.
Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation.
15/12/02 01:17:37 INFO sqoop.Sqoop: Running Sqoop version: 1.4.6
15/12/02 01:17:37 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
15/12/02 01:17:37 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
15/12/02 01:17:37 INFO tool.CodeGenTool: Beginning code generation
15/12/02 01:17:38 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `info` AS t LIMIT 1
15/12/02 01:17:38 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `info` AS t LIMIT 1
15/12/02 01:17:38 INFO orm.CompilationManager: HADOOP_MAPRED_HOME is /software/hadoop-2.6.0
Note: /tmp/sqoop-root/compile/344126e97612def1e3976c1978c2e75e/info.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
15/12/02 01:17:42 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-root/compile/344126e97612def1e3976c1978c2e75e/info.jar
15/12/02 01:17:42 INFO mapreduce.ExportJobBase: Beginning export of info
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/software/hadoop-2.6.0/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/software/hbase-0.98.8-hadoop2/lib/slf4j-log4j12-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
15/12/02 01:17:43 INFO Configuration.deprecation: mapred.jar is deprecated. Instead, use mapreduce.job.jar
15/12/02 01:17:45 INFO Configuration.deprecation: mapred.reduce.tasks.speculative.execution is deprecated. Instead, use mapreduce.reduce.speculative
15/12/02 01:17:45 INFO Configuration.deprecation: mapred.map.tasks.speculative.execution is deprecated. Instead, use mapreduce.map.speculative
15/12/02 01:17:45 INFO Configuration.deprecation: mapred.map.tasks is deprecated. Instead, use mapreduce.job.maps
15/12/02 01:17:46 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
15/12/02 01:17:50 INFO input.FileInputFormat: Total input paths to process : 1
15/12/02 01:17:50 INFO input.FileInputFormat: Total input paths to process : 1
15/12/02 01:17:50 INFO mapreduce.JobSubmitter: number of splits:4
15/12/02 01:17:50 INFO Configuration.deprecation: mapred.map.tasks.speculative.execution is deprecated. Instead, use mapreduce.map.speculative
15/12/02 01:17:50 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1449047829255_0001
15/12/02 01:17:51 INFO impl.YarnClientImpl: Submitted application application_1449047829255_0001
15/12/02 01:17:52 INFO mapreduce.Job: The url to track the job: http://crxy2:8088/proxy/application_1449047829255_0001/
15/12/02 01:17:52 INFO mapreduce.Job: Running job: job_1449047829255_0001
15/12/02 01:18:12 INFO mapreduce.Job: Job job_1449047829255_0001 running in uber mode : false
15/12/02 01:18:12 INFO mapreduce.Job:  map 0% reduce 0%
15/12/02 01:19:10 INFO mapreduce.Job:  map 75% reduce 0%
15/12/02 01:19:12 INFO mapreduce.Job:  map 100% reduce 0%
15/12/02 01:29:41 INFO mapreduce.Job: Task Id : attempt_1449047829255_0001_m_000001_0, Status : FAILED
AttemptID:attempt_1449047829255_0001_m_000001_0 Timed out after 600 secs
15/12/02 01:29:42 INFO mapreduce.Job:  map 75% reduce 0%
15/12/02 01:29:58 INFO mapreduce.Job:  map 100% reduce 0%
15/12/02 01:40:11 INFO mapreduce.Job: Task Id : attempt_1449047829255_0001_m_000001_1, Status : FAILED
AttemptID:attempt_1449047829255_0001_m_000001_1 Timed out after 600 secs
15/12/02 01:40:12 INFO mapreduce.Job:  map 75% reduce 0%
15/12/02 01:40:28 INFO mapreduce.Job:  map 100% reduce 0%
15/12/02 01:50:41 INFO mapreduce.Job: Task Id : attempt_1449047829255_0001_m_000001_2, Status : FAILED
AttemptID:attempt_1449047829255_0001_m_000001_2 Timed out after 600 secs
15/12/02 01:50:42 INFO mapreduce.Job:  map 75% reduce 0%
15/12/02 01:51:00 INFO mapreduce.Job:  map 100% reduce 0%
15/12/02 02:01:13 INFO mapreduce.Job: Job job_1449047829255_0001 failed with state FAILED due to: Task failed task_1449047829255_0001_m_000001
Job failed as tasks failed. failedMaps:1 failedReduces:0


15/12/02 02:01:13 INFO mapreduce.Job: Counters: 32
File System Counters
FILE: Number of bytes read=0
FILE: Number of bytes written=370395
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
HDFS: Number of bytes read=556
HDFS: Number of bytes written=0
HDFS: Number of read operations=15
HDFS: Number of large read operations=0
HDFS: Number of write operations=0
Job Counters 
Failed map tasks=4
Launched map tasks=7
Other local map tasks=3
Data-local map tasks=4
Total time spent by all maps in occupied slots (ms)=2732612
Total time spent by all reduces in occupied slots (ms)=0
Total time spent by all map tasks (ms)=2732612
Total vcore-seconds taken by all map tasks=2732612
Total megabyte-seconds taken by all map tasks=2798194688
Map-Reduce Framework
Map input records=0
Map output records=0
Input split bytes=504
Spilled Records=0
Failed Shuffles=0
Merged Map outputs=0
GC time elapsed (ms)=759
CPU time spent (ms)=5170
Physical memory (bytes) snapshot=245080064
Virtual memory (bytes) snapshot=2529026048
Total committed heap usage (bytes)=46792704
File Input Format Counters 
Bytes Read=0
File Output Format Counters 
Bytes Written=0
15/12/02 02:01:13 INFO mapreduce.ExportJobBase: Transferred 556 bytes in 2,607.4894 seconds (0.2132 bytes/sec)
15/12/02 02:01:13 INFO mapreduce.ExportJobBase: Exported 0 records.
15/12/02 02:01:13 ERROR tool.ExportTool: Error during export: Export job failed!

2015-12-02 08:01:15,791 INFO org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=root OPERATION=Application Finished - Succeeded  TARGET=RMAppManager RESULT=SUCCESS  APPID=application_1449047829255_0002
2015-12-02 08:01:15,793 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler: Application Attempt appattempt_1449047829255_0002_000001 is done. finalState=FINISHED
2015-12-02 08:01:15,793 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.AppSchedulingInfo: Application application_1449047829255_0002 requests cleared
2015-12-02 08:01:15,794 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue: Application removed - appId: application_1449047829255_0002 user: root queue: default #user-pending-applications: 0 #user-active-applications: 0 #queue-pending-applications: 0 #queue-active-applications: 0
2015-12-02 08:01:15,794 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue: Application removed - appId: application_1449047829255_0002 user: root leaf-queue of parent: root #applications: 0
2015-12-02 08:01:15,794 INFO org.apache.hadoop.yarn.server.resourcemanager.RMAppManager$ApplicationSummary: appId=application_1449047829255_0002,name=info.jar,user=root,queue=default,state=FINISHED,trackingUrl=http://crxy2:8088/proxy/application_1449047829255_0002/jobhistory/job/job_1449047829255_0002,appMasterHost=crxy2,startTime=1449069503787,finishTime=1449072069229,finalStatus=FAILED
2015-12-02 08:01:15,796 INFO org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher: Cleaning master appattempt_1449047829255_0002_000001
2015-12-02 08:01:15,873 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler: Null container completed...
2015-12-02 08:01:15,873 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler: Null container completed...
2015-12-02 08:01:16,879 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler: Null container completed...

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提问者看到的是错误的日志。他可以根据评论部分中的建议通过查看失败的任务日志来解决问题。

您需要检查map reduce日志，以找到问题的根本原因。你能检查日志并粘贴它在reduce阶段抛出的错误吗？我添加了上面的日志，请帮我看看。信息不够好，你需要转到reducer任务并提供reducer任务中生成的错误。以上详细信息来自作业日志，您需要深入到任务日志。我提取了此mr的所有日志。如何从所有日志深入到reducer任务？搜索时是否有类似“reduce”的关键字？链接如下：