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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7928) Scanning .META. with startRow and/or stopRow is not giving proper results
Date Fri, 01 Mar 2013 03:43:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590211#comment-13590211
] 

Anoop Sam John commented on HBASE-7928:
---------------------------------------

Ram
 We can have HConstants.META_ROW_DELIMITER_STR constant as byte[] rather than String?
You can avoid Bytes.toBytes() in
{code}
return (com.google.common.primitives.Bytes.indexOf(metaRow,
+        Bytes.toBytes(HConstants.META_ROW_DELIMITER_STR)) != -1);
{code}
Also 
{code}
Bytes.add(
+          scan.getStartRow(),
+          Bytes.toBytes(HConstants.META_ROW_DELIMITER_STR + HConstants.META_ROW_DELIMITER_STR
+              + HConstants.ZEROES)
{code}
can be like
{code}
Bytes.add(scan.getStartRow(),HConstants.META_ROW_DELIMITER_BYTES,Bytes.toBytes(HConstants.ZEROES))
{code}
HConstants.META_ROW_DELIMITER_BYTES  can be byte[] from ",," rather than from ","?

What do you say Ram?

I will open another issue and will add the indexOf() API into HBase util Bytes class (May
be some other useful items also there? I will see). IMO that util may help other users. Any
way that is out of scope of this issue.
                
> Scanning .META. with startRow and/or stopRow is not giving proper results
> -------------------------------------------------------------------------
>
>                 Key: HBASE-7928
>                 URL: https://issues.apache.org/jira/browse/HBASE-7928
>             Project: HBase
>          Issue Type: Bug
>          Components: Usability
>    Affects Versions: 0.94.5
>            Reporter: Jean-Marc Spaggiari
>            Assignee: ramkrishna.s.vasudevan
>         Attachments: HBASE-7928_0.94_1.patch, HBASE-7928_0.94_2.patch, HBASE-7928_0.94_3.patch,
HBASE-7928_0.94.patch, HBASE-7928_trunk_1.patch, HBASE-7928_trunk_2.patch, HBASE-7928_trunk.patch
>
>
> {code}
>     try {
>       HTable metaTable = new HTable(config, Bytes.toBytes(".META."));
>       Scan scan = new Scan();
>       scan.setStartRow(Bytes.toBytes("e"));
>       scan.setStopRow(Bytes.toBytes("z"));
>       ResultScanner scanner = metaTable.getScanner(scan);
>       Result[] results = scanner.next(100);
>       while (results.length > 0) {
>         for (Result result : results) {
>           System.out.println(Bytes.toString(result.getRow()));
>         }
>         results = scanner.next(100);
>       }
>       scanner.close();
>       metaTable.close();
>     } catch (Exception e) {
>       e.printStackTrace();
>     }
> {code}
> This code will not return any result even if there is 10 tables with names starting with
"d" to "w", including one table called "entry". If you comment the setStopRow you will get
results, but will still get rows starting with "d" even if setStartRow is set to "e".
> Same code using with a user table is working fine.
> Facing the same issue with the shell.
> scan '.META.' , {STARTROW => 'e', LIMIT => 10} is returning rows starting by "d".
> scan '.META.' , {STARTROW => 'e', STOPROW => 'v', LIMIT => 10} is not returning
anything.

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