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https://issues.apache.org/jira/browse/HBASE-11541?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liu Shaohui updated HBASE-11541:
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Attachment: HBASE-11541-trunk-v1.diff
Patch for the trunk.
> 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
> Attachments: HBASE-11541-trunk-v1.diff
>
>
> 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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