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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6773) Make the dfs replication factor configurable per table
Date Thu, 13 Sep 2012 14:00:16 GMT
nkeywal created HBASE-6773:
------------------------------

             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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