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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1304) New client server implementation of how gets and puts are handled.
Date Sun, 17 May 2009 19:47:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12710217#action_12710217

stack commented on HBASE-1304:

Sounds like the dictum that deletes only apply to the next file is one we could do without
if we had to.  But, hopefully, its one of those rules you take upon yourself to make processing
cleaner (I haven't looked closely enough at code yet).

@Holstad My guess is that memcache is cleaner if deletes are applied on insertion rather than
what we have now where we have to back up just in case current cell has been deleted?

I'm fine removing deleted (and expired) puts as part of minor compaction.  I don't think it'll
be too taxing.  Obviously, the delete itself must persist in case older files have matching
puts (Major compactions are the time when cells can be dropped because they exceed the maximum-versions
count on the Store and its the time when you get to drop the delete cells themselves after
all of the puts they overshadow have been let go).

I don't think we are doing this or even proposing doing this but just in case, +1 on not deleting
into the future.

> New client server implementation of how gets and puts are handled. 
> -------------------------------------------------------------------
>                 Key: HBASE-1304
>                 URL: https://issues.apache.org/jira/browse/HBASE-1304
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.20.0
>            Reporter: Erik Holstad
>            Assignee: Jonathan Gray
>            Priority: Blocker
>             Fix For: 0.20.0
>         Attachments: HBASE-1304-ryan.patch, hbase-1304-v1.patch, HBASE-1304-v2.patch,
HBASE-1304-v3.patch, HBASE-1304-v4.patch, HBASE-1304-v5.patch, HBASE-1304-v6.patch, HBASE-1304-v7.patch
> Creating an issue where the implementation of the new client and server will go. Leaving
HBASE-1249 as a discussion forum and will put code and patches here.

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