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https://issues.apache.org/jira/browse/HBASE-20229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16407932#comment-16407932
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Toshihiro Suzuki commented on HBASE-20229:
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Thank you [~anoop.hbase] and [~ashish singhi].
I added description and changed the title. I also attached the v2 patch for the
review.
> ConnectionImplementation.locateRegions() returns duplicated entries when
> region replication is on
> -------------------------------------------------------------------------------------------------
>
> Key: HBASE-20229
> URL: https://issues.apache.org/jira/browse/HBASE-20229
> Project: HBase
> Issue Type: Bug
> Reporter: Toshihiro Suzuki
> Assignee: Toshihiro Suzuki
> Priority: Major
> Fix For: 2.0.0
>
> Attachments: HBASE-20229.master.001.patch,
> HBASE-20229.master.002.patch
>
>
> The issue is when region replication is on,
> ConnectionImplementation.locateRegions() returns duplicated entries.
> In the test in my patch, the table should have 1 primary region + 2
> secondaries, but ConnectionImplementation.locateRegions() returns 9 regions.
> Every region repeats 3 times (3 = replicas count).
> I think this is because the following code calls locateRegion() even for
> replica regions and then the result triples.
> {code:java}
> for (RegionInfo regionInfo : regions) {
> RegionLocations list = locateRegion(tableName,
> regionInfo.getStartKey(), useCache, true);
> if (list != null) {
> for (HRegionLocation loc : list.getRegionLocations()) {
> if (loc != null) {
> locations.add(loc);
> }
> }
> }
> {code}
> The fix in my patch is to make it call locateRegion() only for a primary
> region.
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