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https://issues.apache.org/jira/browse/HBASE-11541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069571#comment-14069571
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Hudson commented on HBASE-11541:
--------------------------------
FAILURE: Integrated in HBase-TRUNK #5330 (See
[https://builds.apache.org/job/HBase-TRUNK/5330/])
HBASE-11541 Wrong result when scaning meta with startRow (Liu Shaoqui) (stack:
rev 3e82a84ca8eaed3ecee9b7d1cf110921e6e8f02a)
* hbase-common/src/main/java/org/apache/hadoop/hbase/KeyValue.java
* hbase-common/src/test/java/org/apache/hadoop/hbase/TestKeyValue.java
> Wrong result when scaning meta with startRow
> --------------------------------------------
>
> Key: HBASE-11541
> URL: https://issues.apache.org/jira/browse/HBASE-11541
> Project: HBase
> Issue Type: Bug
> Reporter: Liu Shaohui
> Assignee: Liu Shaohui
> Priority: Minor
> Fix For: 0.99.0, 0.98.5, 2.0.0
>
> Attachments: HBASE-11541-trunk-v1.diff, HBASE-11541.patch,
> HBASE-11541.patch
>
>
> When we scan the meta with STARTROW optiion, wrong result may be returned.
> For exmaple: if there are two tables named "a" and "b" in hbase, when we scan
> the meta with startrow = 'b', the region location of table "a" will be
> returned but we expect to get the region location of table "b".
> {code}
> > create 'a', {NAME => 'f'}
> > create 'b', {NAME => 'f'}
> > scan '.META.', {STARTROW => 'b', LIMIT => 1}
> a,,1405655897758.f8b547476b6dc80545e6413c31396, xxxx
> {code}
> The reason is the wrong assumption in MetaKeyComparator
> See: KeyValue.java#2011
> {code}
> int leftDelimiter = getDelimiter(left, loffset, llength,
> HRegionInfo.DELIMITER);
> int rightDelimiter = getDelimiter(right, roffset, rlength,
> HRegionInfo.DELIMITER);
> if (leftDelimiter < 0 && rightDelimiter >= 0) {
> // Nothing between .META. and regionid. Its first key.
> return -1;
> } else if (rightDelimiter < 0 && leftDelimiter >= 0) {
> return 1;
> } else if (leftDelimiter < 0 && rightDelimiter < 0) {
> return 0;
> }
> {code}
> It's a little troublesome to fix this problem for given a start row which
> contains more than two "," for meta, it's not easy to extract the startKey of
> region.
> eg: STARTROW => 'aaa,bbb,ccc,xxx'.
> Comments and suggestions are welcomed. Thanks
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