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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1234) Change HBase StoreKey format
Date Wed, 18 Mar 2009 23:07:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683225#action_12683225

stack commented on HBASE-1234:

Things to do other than make all tests run:

Sizes for memory have to be redone for things like KV and Memcache (but should be easier now
with things like the sizeof tool).

revisit how deletes work -- this is in-process at the moment (I removed the DeleteRow in last
patch because as Erik Holstad pointed out, at least inside in a StoreFile or in Memcache,
it means nothing).

Need to talk to Clint Morgan.  He might want to change his transactional types to use the
new Key Type field.

> Change HBase StoreKey format
> ----------------------------
>                 Key: HBASE-1234
>                 URL: https://issues.apache.org/jira/browse/HBASE-1234
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Assignee: stack
>             Fix For: 0.20.0
>         Attachments: 1234-v2.patch, 1234.patch
> 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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