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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1304) New client server implementation of how gets and puts are handled.
Date Tue, 12 May 2009 08:22:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12708362#action_12708362

Jonathan Gray commented on HBASE-1304:

I'm about 2/3 done with scanners.  The last bit is the hardest to deal with because of the
multi-leveled complexity.  A scan is opened, and then nexted one row at a time.  Each query
uses one region at a time, and for that region, has a scanner per store (family) and for each
store, a scanner for memcache and one for the storefiles.  Within the storefiles, there is
a scanner for each hfile.  This has to be all be intelligently and efficiently merged.

The primary issue I'm dealing with now is that Memcache is not immutable, so the "next" row
can change between calls.  For that reason, it doesn't seem to make sense to actually make
them stateful.  Rather, it uses tailSet() on every next call.

Should have a patch up for Scans tomorrow.  I've done some stuff for Puts and Deletes but
not patch-ready yet, should be tomorrow or wednesday depending on scanner testing goes.

> 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-v1.patch, HBASE-1304-v2.patch, HBASE-1304-v3.patch, HBASE-1304-v4.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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