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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5520) Support reseek() at RegionScanner
Date Fri, 09 Mar 2012 20:26:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226414#comment-13226414
] 

stack commented on HBASE-5520:
------------------------------

{code}
+      if (kv == null) {$
+        throw new IllegalArgumentException("Row cannot be null.");$
+      }$
{code}

Should be kv cannot be null?

I don't understand what this means:

{code}
The kv that is required to seek must be given$
+   * explicitly for reseek. Should not be used to seek to a key which may come$
+   * before the current position.$
+   * Note : Recommended to use knowing how seek can be done on different kvs.$
+   * Suggested to seek to row boundaries like start of a row or end of a row.$
+   * Seeking to the middle of a row may lead to inconsistencies across stores.$
{code}

... its probably because I'm slow but I'm sure there will be slow fellows following behind
me.  Is it saying you need to create a KV to do this?

How would I know what the next row is in advance?  I suppose with the mvcc, you have some
hope of isolating this row... but  if we are going for row boundaries, this patch looks to
be missing some heft.
                
> Support reseek() at RegionScanner
> ---------------------------------
>
>                 Key: HBASE-5520
>                 URL: https://issues.apache.org/jira/browse/HBASE-5520
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.92.0
>            Reporter: Anoop Sam John
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.96.0
>
>         Attachments: HBASE-5520_1.patch, HBASE-5520_2.patch
>
>
> reseek() is not supported currently at the RegionScanner level. We can support the same.
> This is created following the discussion under HBASE-2038

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