Hive should be able to run on multiple data centers
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Key: HIVE-1813
URL: https://issues.apache.org/jira/browse/HIVE-1813
Project: Hive
Issue Type: New Feature
Reporter: Namit Jain
Fix For: 0.7.0
Currently, hive assumes a single metastore and the HADOOP_HOME is passed as a
environment variable.
It would be desirable to support hive on top of multiple data centers (dfs +
mr).
For eg. there could be 2 metastores: primary and secondary. They would have
different dfs's , and there will be a
dfs->mr mapping maintained by the metastore.
Hive would be enhanced to support multiple metastores and all operations (ddl +
query) would span multiple metastores.
Different consistency pluggable policies can be employed - for eg. if a
table/partition can be present in both the metastores with different
last modification times, either the last one can be used or an error can be
thrown.
It will be upto the application (outside hive) to copy the data from one
metastore to another, and to maintain consistency inside.
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