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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9898) Have a way to set a different default compression on HCD
Date Wed, 06 Nov 2013 00:28:17 GMT
Jean-Daniel Cryans created HBASE-9898:
-----------------------------------------

             Summary: Have a way to set a different default compression on HCD
                 Key: HBASE-9898
                 URL: https://issues.apache.org/jira/browse/HBASE-9898
             Project: HBase
          Issue Type: Improvement
            Reporter: Jean-Daniel Cryans
             Fix For: 0.98.0


I was exploring if there would be a nice way to set the compression by default to a different
algorithm but I didn't find any that I can implement right now, dumping my ideas so that others
can chime in.

I think the best place to take it into account would be on the master's side. Basically you
run a check when creating a new table to see if compression wasn't set, and if so then set
it to the new default. The important thing is you don't want to replace NONE, because that
might be the user's goal to set it like that.

The main problem is that the normal HCD constructor calls the deprecated constructor that
sets most of the properties to their defaults, including compression, which means that it
will always be NONE instead of null.

It appears that this constructor has been deprecated since February 2012 (https://github.com/apache/hbase/blame/0.94/src/main/java/org/apache/hadoop/hbase/HColumnDescriptor.java#L292)
so maybe we can remove it in the next major version and make our life easier?



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