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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1234) Change HBase StoreKey format
Date Tue, 03 Mar 2009 06:14:56 GMT
Change HBase StoreKey format
----------------------------

                 Key: HBASE-1234
                 URL: https://issues.apache.org/jira/browse/HBASE-1234
             Project: Hadoop HBase
          Issue Type: Improvement
            Reporter: stack
             Fix For: 0.20.0


HBASE-859 cleaned up keys removing the need of HRegionInfo being in the context comparing
keys.  This issue is about changing the format.  Work done in HBASE-859 means changes have
been localized to HStoreKey, in particular to comparators and parse routines.  We should do
this now since 0.20.0 will require rewriting all data.

Things to consider:

<row> <columnfamily> <columnqualifier> <timestamp> <keytype>

Or leave off columnfamily altogether and just write it once into the hfile metadata (All key
compares are done in the Store context so columnfamily can be safely left out of the equation;
its only when the key rises above Store that the columnfamily needs appending).

keytype is probably a byte. Types are delete cell, delete row, delete family, delete column?
 What else?  Where should we put it?  At the end?  How should type sort?  Or should it not
be part of sort so its just the order at which we encounter the key?

How are we going to support keys that go in out of chronological order?

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