Hadoop Metastore不会初始化

Question

前言:我是hadoop / hive的新手。我已经安装了独立的hadoop，现在我正在尝试让hive工作。我一直收到关于初始化元存储的错误，并且似乎找不到解决方法。(hadoop 2.7.2和hive 2.0)

设置了HADOOP_HOME和HIVE_HOME

ubuntu15-laptop: ~ $>echo $HADOOP_HOME
/usr/hadoop/hadoop-2.7.2

ubuntu15-laptop: ~ $>echo $HIVE_HOME
/usr/hive

hdfs工作正常

ubuntu15-laptop: ~ $>hadoop fs -ls /
Found 2 items
drwxrwxr-x   - testuser supergroup          0 2016-04-13 21:37 /tmp
drwxrwxr-x   - testuser supergroup          0 2016-04-13 21:38 /user

ubuntu15-laptop: ~ $>hadoop fs -ls /user
Found 1 items
drwxrwxr-x   - testuser supergroup          0 2016-04-13 21:38 /user/hive

ubuntu15-laptop: ~ $>hadoop fs -ls /user/hive
Found 1 items
drwxrwxr-x   - testuser supergroup          0 2016-04-13 21:38 /user/hive/warehouse

ubuntu15-laptop: ~ $>groups
testuser adm cdrom sudo dip plugdev lpadmin sambashare

蜂窝不工作。说我需要初始化我的转移存储

ubuntu15-laptop: ~ $>hive

Logging initialized using configuration in
jar:file:/usr/hive/lib/hive-common-2.0.0.jar!/hive-log4j2.properties
Exception in thread "main" java.lang.RuntimeException: Hive metastore database
is not initialized. Please use schematool (e.g. ./schematool -initSchema
-dbType ...) to create the schema. If needed, don't forget to include the 
option to auto-create the underlying database in your JDBC connection string
(e.g. ?createDatabaseIfNotExist=true for mysql)

因此，我尝试使用postgres对其进行初始化，但schematool尝试使用derby

ubuntu15-laptop: ~ $>schematool -initSchema -dbType postgres
Metastore connection URL:  jdbc:derby:;databaseName=metastore_db;create=true
Metastore Connection Driver :  org.apache.derby.jdbc.EmbeddedDriver
Metastore connection User:   APP
Starting metastore schema initialization to 2.0.0
Initialization script hive-schema-2.0.0.postgres.sql
Error: Syntax error: Encountered "statement_timeout" at line 1, column 5.
(state=42X01,code=30000)
org.apache.hadoop.hive.metastore.HiveMetaException: Schema initialization
FAILED! Metastore state would be inconsistent !!
*** schemaTool failed ***

因此，我将hive-site.xml更改为使用postgres驱动程序等，但是因为我没有安装驱动程序，所以它失败了

ubuntu15-laptop: ~ $>cp /usr/hive/conf/hive-site.xml.templ /usr/hive/conf/hive-site.xml
ubuntu15-laptop: ~ $>schematool -initSchema -dbType postgres
Metastore connection URL:  jdbc:postgresql://localhost:5432/hivedb
Metastore Connection Driver :  org.postgresql.Driver
Metastore connection User:   123456
org.apache.hadoop.hive.metastore.HiveMetaException: Failed to load driver
*** schemaTool failed ***

因此，我尝试使用derby，首先将hive-site.xml移出障碍，因此缺省为derby

ubuntu15-laptop: ~ $>mv /usr/hive/conf/hive-site.xml /usr/hive/conf/hive-site.xml.templ

然后我再次尝试使用derby进行初始化，但似乎已经根据错误" error : FUNCTION 'NUCLEUS_ASCII‘already“进行了初始化。

ubuntu15-laptop: ~ $>schematool -initSchema -dbType derby
Metastore connection URL:  jdbc:derby:;databaseName=metastore_db;create=true
Metastore Connection Driver :  org.apache.derby.jdbc.EmbeddedDriver
Metastore connection User:   APP
Starting metastore schema initialization to 2.0.0
Initialization script hive-schema-2.0.0.derby.sql
Error: FUNCTION 'NUCLEUS_ASCII' already exists. (state=X0Y68,code=30000)
org.apache.hadoop.hive.metastore.HiveMetaException: Schema initialization
FAILED! Metastore state would be inconsistent !!
*** schemaTool failed ***

我已经干了两天了。任何帮助都将不胜感激。

Answer 1

所以..。

事情是这样的。

安装hive后，我做的第一件事就是运行hive，它试图创建/初始化metastore_db，但显然没有正确完成。在最初的运行中，我得到了这个错误：

Exception in thread "main" java.lang.RuntimeException: Hive metastore database is not initialized. Please use schematool (e.g. ./schematool -initSchema -dbType ...) to create the schema. If needed, don't forget to include the option to auto-create the underlying database in your JDBC connection string (e.g. ?createDatabaseIfNotExist=true for mysql)

运行hive，即使它失败了，也在我运行hive的目录中创建了一个metastore_db目录：

ubuntu15-laptop: ~ $>ls -l |grep meta
drwxrwxr-x 5 testuser testuser 4096 Apr 14 12:44 metastore_db

所以当我尝试跑步的时候

ubuntu15-laptop: ~ $>schematool -initSchema -dbType derby

转移体已经存在，但不是完整的。

所以答案是：

1. 在第一次运行配置单元之前，请运行

schematool -initSchema -dbType derby

• 如果您已经运行了hive，然后尝试initSchema，但它失败了：

mv metastore_db.tmp

• Re metastore_db运行

schematool -initSchema -dbType derby

• Run hive Run

**还要注意:如果您更改目录，将找不到上面创建的metastore_db！我确信这有一个我还不知道的很好的原因，因为我今天真的是第一次尝试使用hive。啊，这是关于这个的信息：metastore_db created wherever I run Hive