THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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There are 3 different ways to setup metastore server using different Hive configurations. The relevant configuration parameters are
Config Param | Description |
|---|---|
javax.jdo.option.ConnectionURL | JDBC connection string for the data store which contains metadata |
javax.jdo.option.ConnectionDriverName | JDBC Driver class name for the data store which contains metadata |
hive.metastore.uris | Hive connects to this URI to make metadata requests for a remote metastore |
hive.metastore.local | local or remote metastore (Removed as of Hive 0.10: If |
hive.metastore.warehouse.dir | URI of the default location for native tables |
These variables were carried over from old documentation without a guarantee that they all still exist:
Variable Name | Description | Default Value |
|---|---|---|
hive.metastore.metadb.dir |
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hive.metastore.usefilestore |
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hive.metastore.rawstore.impl |
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org.jpox.autoCreateSchema | Creates necessary schema on startup if one doesn't exist. (e.g. tables, columns...) Set to false after creating it once. |
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org.jpox.fixedDatastore | Whether the datastore schema is fixed. |
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hive.metastore.checkForDefaultDb |
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hive.metastore.ds.connection.url.hook | Name of the hook to use for retriving the JDO connection URL. If empty, the value in javax.jdo.option.ConnectionURL is used as the connection URL |
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hive.metastore.ds.retry.attempts | The number of times to retry a call to the backing datastore if there were a connection error | 1 |
hive.metastore.ds.retry.interval | The number of miliseconds between datastore retry attempts | 1000 |
hive.metastore.server.min.threads | Minimum number of worker threads in the Thrift server's pool. | 200 |
hive.metastore.server.max.threads | Maximum number of worker threads in the Thrift server's pool. | 10000 |
Default configuration sets up an embedded metastore which is used in unit tests and is described in the next section. More practical options are described in the subsequent sections.
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Mainly used for unit tests and only one process can connect to metastore at a time. So it is not really a practical solution but works well for unit tests.
Config Param | Config Value | Comment | ||
|---|---|---|---|---|
javax.jdo.option.ConnectionURL | | derby database located at hive/trunk/build... | ||
javax.jdo.option.ConnectionDriverName | org.apache.derby.jdbc.EmbeddedDriver | Derby embeded JDBC driver class | ||
hive.metastore.uris | not needed since this is a local metastore |
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hive.metastore.local | true | embeded is local | ||
hive.metastore.warehouse.dir |
| unit test data goes in here on your local filesystem |
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In local metastore setup, each Hive Client will open a connection to the datastore and make SQL queries against it. The following config will setup a metastore in a MySQL server. Make sure that the server accessible from the machines where Hive queries are executed since this is a local store. Also the jdbc client library is in the classpath of Hive Client.
Config Param | Config Value | Comment |
|---|---|---|
javax.jdo.option.ConnectionURL | | metadata is stored in a MySQL server |
javax.jdo.option.ConnectionDriverName | com.mysql.jdbc.Driver | MySQL JDBC driver class |
javax.jdo.option.ConnectionUserName | <user name> | user name for connecting to mysql server |
javax.jdo.option.ConnectionPassword | <password> | password for connecting to mysql server |
hive.metastore.uris | not needed because this is local store |
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hive.metastore.local | true | this is local store |
hive.metastore.warehouse.dir | <base hdfs path> | default location for Hive tables. |
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Server Configuration Parameters
Config Param | Config Value | Comment |
|---|---|---|
javax.jdo.option.ConnectionURL | jdbc:mysql://<host name>/<database name>?createDatabaseIfNotExist=true | metadata is stored in a MySQL server |
javax.jdo.option.ConnectionDriverName | com.mysql.jdbc.Driver | MySQL JDBC driver class |
javax.jdo.option.ConnectionUserName | <user name> | user name for connecting to mysql server |
javax.jdo.option.ConnectionPassword | <password> | password for connecting to mysql server |
hive.metastore.warehouse.dir | <base hdfs path> | default location for Hive tables. |
Client Configuration Parameters
Config Param | Config Value | Comment |
|---|---|---|
hive.metastore.uris | thrift://<host_name>:<port> | host and port for the thrift metastore server |
hive.metastore.local | false | this is local store |
hive.metastore.warehouse.dir | <base hdfs path> | default location for Hive tables. |
If you are using MySQL as the datastore for metadata, put MySQL client libraries in HIVE_HOME/lib before starting Hive Client or HiveMetastore Server.
Metastore Deployment Options in Pictures
^metastore_usage.pptx