nkeywal created HBASE-6773:
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Summary: Make the dfs replication factor configurable per table
Key: HBASE-6773
URL: https://issues.apache.org/jira/browse/HBASE-6773
Project: HBase
Issue Type: Improvement
Components: regionserver
Affects Versions: 0.96.0
Reporter: nkeywal
Today, it's an application level configuration. So all the HFiles are
replicated 3 times per default.
There are some reasons to make it per table:
- some tables are critical while some others are not. For example, meta would
benefit from an higher level of replication, to ensure we continue working even
when we lose 20% of the cluster.
- some tables are backuped somewhere else, used by non essential process, so
the user may accept a lower level of replication for these ones.
- it should be a dynamic parameter. For example, during a bulk load we set a
replication of 1 or 2, then we increase it. It's in the same space as disabling
the WAL for some writes.
The case that seems important to me is meta. We can also handle this one by a
specific parameter in the usual hbase-site.xml if we don't want a generic
solution.
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