Hive安装及问题解决

刚刚安装好Hadoop迫不及待要玩下hive，所以自己找了些资料，安装了下hive，这里记录详细的安装过程和碰到的问题：

1.在安装hadoop之前首先确定hadoop已经安装成功，具体安装方法请参考hadoop安装 见 http://www.linuxidc.com/Linux/2011-12/48784.htm 与 http://www.linuxidc.com/Linux/2011-12/48783.htm。
2.下载hive版本 我下载的是

下载地址为http://hive.apache.org/releases.htm

解压文件：

tar -zxvf hive-0.7.0-bin.tar.gz

3.配置环境变量：

[root@localhost hive]# vim /etc/profile

export HADOOP_HOME=/root/hadoop-0.20.2

export PATH=$PATH:$HADOOP_HOME/bin

export HIVE_HOME=/usr/hive/hive-0.7.0-bin

PATH=$PATH:$HIVE_HOME/bin

export PATH

export JAVA_HOME=/usr/java/jdk1.7.0_01

4.我存储元数据是采用第三方的mysql数据库，这种情况下需要下载一个数据包mysql-connector-java-5.1.18-bin.jar，放到hive的lib目录下

在hive的conf目录下创建文件hive-site.xml配置文件，代码如下：

<?xml version="1.0"?>

<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<configuration>

<property>

<name>hive.metastore.local</name>

<value>true</value>

</property>

<property>

<name>javax.jdo.option.ConnectionURL</name>

<value>jdbc:mysql://192.168.0.237:3306/metastore_db?createDatabaseIfNotExist=true</value>

</property>

<property>

<name>javax.jdo.option.ConnectionDriverName</name>

<value>com.mysql.jdbc.Driver</value>

</property>

<property>

<name>javax.jdo.option.ConnectionUserName</name>

<value>t237</value>

</property>

<property>

<name>javax.jdo.option.ConnectionPassword</name>

<value>123456</value>

</property>

<property>

<name>datanucleus.fixedDatastore</name>

<value>false</value>

</property>

</configuration>

5.运行hive

[root@localhost conf]# hive

Hive history file=/tmp/root/hive_job_log_root_201112061510_1145168119.txt

hive> show tables;

OK

log

log_info

log_new

maptile

result

Time taken: 2.889 seconds

hive>

6.这里遇到点问题：刚开始执行hive时，执行show tables；报如下错误：

FAILED: Hive Internal Error: java.lang.RuntimeException(Error while making MR scratch directory - check filesystem config (null))

java.lang.RuntimeException: Error while making MR scratch directory - check filesystem config (null)

后来询问了google，得到如下解决办法：

原有的hadoop配置文件core-site.xml信息如下：

<pre name="code" class="plain"><!-- Put site-specific property overrides in this file. -->

<configuration>

<property>

<name>hadoop.tmp.dir</name>

<value>/hadoop-root/tmp</value>

</property>

<property>

<name>fs.default.name</name>

<value>hdfs://192.168.30.149:9000/</value>

</property>

</configuration>

改成：

<!-- Put site-specific property overrides in this file. -->

<configuration>

<property>

<name>hadoop.tmp.dir</name>

<value>/hadoop-root/tmp</value>

</property>

<property>

<name>fs.default.name</name>

<value>hdfs://hadoop149:9000/</value>

</property>

</configuration>

重启hadoop，运行hive，问题解决。

之后创建表一直很顺利，但是到查询表例如我执行：select size from log limit 10;时，又报错如下：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/hive/conf/HiveConf

后来问了下百度和google都没有结果，自己觉得是缺少了类文件，我便把hive/lib下所有的hive-*文件拷贝到hadoop的lib下

重启hadoop，问题解决。但是归根结底我觉得是$HADOOP_CLASSPATH变量没有配置清楚，这个之后再解决这里做个标记。

执行select 后运行正常：

hive> select size from log_info limit 12;

Total MapReduce jobs = 1

Launching Job 1 out of 1

Number of reduce tasks is set to 0 since there's no reduce operator

Starting Job = job_201112061127_0004, Tracking URL = http://hadoop149:50030/jobdetails.jsp?jobid=job_201112061127_0004
Kill Command = /root/hadoop-0.20.2/bin/hadoop job -Dmapred.job.tracker=hdfs://192.168.30.149:9004 -kill job_201112061127_0004

2011-12-06 15:35:47,923 Stage-1 map = 0%, reduce = 0%

2011-12-06 15:35:50,952 Stage-1 map = 9%, reduce = 0%

2011-12-06 15:35:52,975 Stage-1 map = 27%, reduce = 0%

2011-12-06 15:35:53,984 Stage-1 map = 45%, reduce = 0%

2011-12-06 15:35:56,001 Stage-1 map = 64%, reduce = 0%

2011-12-06 15:35:59,023 Stage-1 map = 82%, reduce = 0%

2011-12-06 15:36:00,038 Stage-1 map = 100%, reduce = 0%

2011-12-06 15:36:03,062 Stage-1 map = 100%, reduce = 100%

Ended Job = job_201112061127_0004

现在又找到的心得问题：在执行删除表操作时，出现如下错误:

NestedThrowables:

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Specified key was too long; max key length is 767 bytes

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

这个问题还没有解决：期待牛人解决

最后附上：内存数据库derby的配置

<configuration>

<property>

<name>hive.metastore.local</name>

<value>true</value>

<description>controls whether to connect to remove metastore server or open a new metastore server in Hive Client JVM</description>

</property>

<property>

<name>javax.jdo.option.ConnectionURL</name>

<value>jdbc:derby://hadoop149:1527/metastore_db;create=true</value>

<description>JDBC connect string for a JDBC metastore</description>

</property>

<property>

<name>javax.jdo.option.ConnectionDriverName</name>

<value>org.apache.derby.jdbc.ClientDriver</value>

<description>Driver class name for a JDBC metastore</description>

</property>

</configuration>