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From "Max Lapan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8959) Bitmasks handling
Date Tue, 16 Jul 2013 16:10:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709877#comment-13709877
] 

Max Lapan commented on HBASE-8959:
----------------------------------

When such update performed by a client, there is a chance of concurrent update. One task can
set one bit, other update another in the same byte and the whole result is unpredictable.
If bit operations are in KeyValues, there is no such problem - both clients put two KeyValues
which update different bits. On nexct compact, RS will combine them into correct value.
                
> Bitmasks handling
> -----------------
>
>                 Key: HBASE-8959
>                 URL: https://issues.apache.org/jira/browse/HBASE-8959
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Max Lapan
>            Priority: Minor
>
> I think it would be useful to natively support bitmasks in hbase columns with ability
to check/set/clear/toggle individual bits in byte[] for any column. 
> Now, we forced to store lots of feature flags as separate, 1-byte values, which  is a
waste of space. Compression helps, I guess, but anyway, not ideal.
> I see this as a set of new KeyValue.Type, which describes needed bit-operations. Operations
itself performed on compaction or scan process. Similiar things a performed for KeyValue.Minimum
and KeyValue.Maximum. 
> What do you think about this feature? Maybe, I'm missing something and it is much harder
to implement than I think?

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