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Editor to share with you what are the common problems in hive, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Frequently asked questions about hive

1. Org.apache.thrift.transport.TTransportException: Could not create ServerSocket on address 0.0.0.0/0.0.0.0:10000

Problem: hive-- service hiveserver starts the hiveserver service

Solution: Port is occupied, kill the port process or redefine port hive-- service hiveserver-p 10001

2. Error in metadata: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient

Solution:. / hive-hiveconf hive.root.logger=DEBUG,console

Output the error log and modify it. Generally speaking, it is a problem of hive users' mysql library permissions.

3. Error: dl failure on line 864

Error: failed / home/app/jdk1.7.0_21/jre/lib/i386/client/libjvm.so, because / home/app/jdk1.7.0_21/jre/lib/i386/client/libjvm.so: cannot restore segment prot after reloc: Permission denied

Solution: / usr/sbin/setenforce 0

4. A Filesystem closed exception occurred while running the Hadoop program.

By verifying that the cache is set. The cache needs to be canceled.

By modifying the configuration file core-site.xml:

Fs.hdfs.impl.disable.cache

True

The above problem still occurs in the program.

In the program, add this statement: JobConf jobConf.set ("fs.hdfs.impl.disable.cache", "true")

The program runs successfully.

5 Failed with exception Unable to move sourcehdfs://vmtmstorm01:8020/test to destination hdfs://vmtmstorm01:8020/user/hive/warehouse/ptest/name=ww/test

FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.MoveTask

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