question Re: HiveMetaStore ClassNotFoundException in Archives of Support Questions (Read Only)

HiveMetaStore ClassNotFoundException

stampy88 — Fri, 16 Sep 2022 08:50:38 GMT

Hi all,

I installed Hive using Cloudera Manager

Version: Cloudera Standard 4.7.3 (#163 built by jenkins on 20131030-1651 git: 73aaa4b1d5948460ab9ae67fc12426aefb84b43c)

Whenever I try and start the Hive Meta Store through the UI, I get the following error (from stderr)

+ exec /opt/cloudera/parcels/CDH-4.5.0-1.cdh4.5.0.p0.30/lib/hive/bin/hive --config /run/cloudera-scm-agent/process/1470-hive-HIVEMETASTORE --service metastore -p 9083
Exception in thread "main" java.lang.ClassNotFoundException: org.apache.hadoop.hive.metastore.HiveMetaStore
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.util.RunJar.main(RunJar.java:201)

Anyone encounter this before?

thanks

dave

Re: HiveMetaStore ClassNotFoundException

Darren — Tue, 26 Nov 2013 21:55:45 GMT

Hi Dave,

This is usually caused because you have set a bad safety valve for MapReduce or Yarn client enviornment, usually because you installed LZO and made a mistake when the safety valve for MR to pick up the parcel.

Here's the docs for using the LZO parcel:

http://www.cloudera.com/content/cloudera-content/cloudera-docs/CM4Ent/4.6.2/Cloudera-Manager-Installation-Guide/cmig_install_LZO_Compression.html

The mistake people often make is forgetting to append to the existing value for HADOOP_CLASSPATH or any other variable. Since Hive uses MR client configs, when it sources haddop-env.sh it will have its classpath overwritten by your MR client env safety valve.

So this is bad for client environment safety valves:

HADOOP_CLASSPATH=/my/new/stuff

and this is good:

HADOOP_CLASSPATH=$HADOOP_CLASSPATH:/my/new/stuff

Thanks,

Darren

Re: HiveMetaStore ClassNotFoundException

stampy88 — Wed, 27 Nov 2013 00:44:56 GMT

That was absolutely it Darren. Someone attempted to install LZO on this dev cluster and did it improperly.

Thanks much!

dave