运行命令：
sqoop import --connect "jdbc:mysql://x.x.x.x:3306/intelligent_qa_bms?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull" --username root --password xxxx --query "select id,siteName,type,section,title,content,url,word_count,status,publishDate,crawlDate from crawl_znwd_all where updateDate <= 20190717 and word_count <= 800 AND status=2 and $CONDITIONS;" -m 1 --null-string 'null' --null-non-string 'null' --fields-terminated-by '￥' --lines-terminated-by ' ' --hive-drop-import-delims --target-dir /znwd/input --as-textfile --delete-target-dir
报错一：
mapred.ClientServiceDelegate: Application state is completed. FinalApplicationStatus=FAILED. Redirecting to job history server
19/07/18 10:54:16 INFO ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
19/07/18 10:54:17 INFO ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
19/07/18 10:54:18 INFO ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
19/07/18 10:54:19 INFO ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
19/07/18 10:54:20 INFO ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:10020. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
解决办法：
在mapred-site.xml添加配置：
<property>
<name>mapreduce.jobhistory.address</name>
<value>HDFSNameNode:10020</value>
</property>
报错二：
9/07/18 11:04:51 INFO mapreduce.Job: map 0% reduce 100%
19/07/18 11:04:51 INFO mapreduce.Job: Job job_1562900696500_0017 failed with state FAILED due to:
19/07/18 11:04:51 INFO mapreduce.ImportJobBase: The MapReduce job has already been retired. Performance
19/07/18 11:04:51 INFO mapreduce.ImportJobBase: counters are unavailable. To get this information,
19/07/18 11:04:51 INFO mapreduce.ImportJobBase: you will need to enable the completed job store on
19/07/18 11:04:51 INFO mapreduce.ImportJobBase: the jobtracker with:
19/07/18 11:04:51 INFO mapreduce.ImportJobBase: mapreduce.jobtracker.persist.jobstatus.active = true
19/07/18 11:04:51 INFO mapreduce.ImportJobBase: mapreduce.jobtracker.persist.jobstatus.hours = 1
19/07/18 11:04:51 INFO mapreduce.ImportJobBase: A jobtracker restart is required for these settings
19/07/18 11:04:51 INFO mapreduce.ImportJobBase: to take effect.
19/07/18 11:04:51 ERROR tool.ImportTool: Import failed: Import job failed!
解决办法：
权限问题，对hdfs目录没有权限，切换到指定目录有权限的用户即可解决；
同时在mapred-site.xml添加配置（先加的此配置，并不能解决问题，切换到指定用户后解决，所以应该就是权限的问题，此配置也可以不加）：
<property>
<name>mapreduce.jobtracker.persist.jobstatus.active</name>
<value>true</value>
</property>
<property>
<name>mapreduce.jobtracker.persist.jobstatus.hours</name>
<value>1</value>
</property>
问题三：
19/07/18 11:15:10 INFO mapreduce.Job: Task Id : attempt_1562900696500_0019_m_000000_0, Status : FAILED
Container [pid=89807,containerID=container_1562900696500_0019_01_000002] is running beyond virtual memory limits. Current usage: 549.3 MB of 1 GB physical memory used; 4.0 GB of 2.1 GB virtual memory used. Killing container.
Dump of the process-tree for container_1562900696500_0019_01_000002 :
|- PID PPID PGRPID SESSID CMD_NAME USER_MODE_TIME(MILLIS) SYSTEM_TIME(MILLIS) VMEM_USAGE(BYTES) RSSMEM_USAGE(PAGES) FULL_CMD_LINE
|- 89807 89804 89807 89807 (bash) 4 3 115920896 370 /bin/bash -c /home/admin/jdk1.8.0_144/bin/java -Djava.net.preferIPv4Stack=true -Dhadoop.metrics.log.level=WARN -Xmx2048M -Djava.io.tmpdir=/admin_data/hadoop_tmp/nm-local-dir/usercache/zhaolei/appcache/application_1562900696500_0019/container_1562900696500_0019_01_000002/tmp -Dlog4j.configuration=container-log4j.properties -Dyarn.app.container.log.dir=/home/admin/hadoop-2.7.3/logs/userlogs/application_1562900696500_0019/container_1562900696500_0019_01_000002 -Dyarn.app.container.log.filesize=0 -Dhadoop.root.logger=INFO,CLA -Dhadoop.root.logfile=syslog org.apache.hadoop.mapred.YarnChild 192.168.10.15 36756 attempt_1562900696500_0019_m_000000_0 2 1>/home/admin/hadoop-2.7.3/logs/userlogs/application_1562900696500_0019/container_1562900696500_0019_01_000002/stdout 2>/home/admin/hadoop-2.7.3/logs/userlogs/application_1562900696500_0019/container_1562900696500_0019_01_000002/stderr
|- 90025 89807 89807 89807 (java) 1477 86 4182704128 140259 /home/admin/jdk1.8.0_144/bin/java -Djava.net.preferIPv4Stack=true -Dhadoop.metrics.log.level=WARN -Xmx2048M -Djava.io.tmpdir=/admin_data/hadoop_tmp/nm-local-dir/usercache/zhaolei/appcache/application_1562900696500_0019/container_1562900696500_0019_01_000002/tmp -Dlog4j.configuration=container-log4j.properties -Dyarn.app.container.log.dir=/home/admin/hadoop-2.7.3/logs/userlogs/application_1562900696500_0019/container_1562900696500_0019_01_000002 -Dyarn.app.container.log.filesize=0 -Dhadoop.root.logger=INFO,CLA -Dhadoop.root.logfile=syslog org.apache.hadoop.mapred.YarnChild 192.168.10.15 36756 attempt_1562900696500_0019_m_000000_0 2
Container killed on request. Exit code is 143
Container exited with a non-zero exit code 143
解决办法：
此问题并不影响执行结果，但是如果想追求完美的话依然需要解决：
在yarn-site.xml中添加配置：
<property>
<name>yarn.nodemanager.resource.memory-mb</name>
<value>300000</value>
</property>
<property>
<name>yarn.scheduler.maximum-allocation-mb</name>
<value>30000</value>
</property>
<property>
<name>yarn.scheduler.minimum-allocation-mb</name>
<value>3000</value>
</property>
<property>
<name>mapreduce.reduce.memory.mb</name>
<value>2000</value>
</property>