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https://issues.apache.org/jira/browse/HBASE-28357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17817204#comment-17817204
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Hudson commented on HBASE-28357:
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Results for branch branch-2.4
[build #694 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/694/]:
(x) *{color:red}-1 overall{color}*
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details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/694/General_20Nightly_20Build_20Report/]
(/) {color:green}+1 jdk8 hadoop2 checks{color}
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report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/694/JDK8_20Nightly_20Build_20Report_20_28Hadoop2_29/]
(x) {color:red}-1 jdk8 hadoop3 checks{color}
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(/) {color:green}+1 jdk11 hadoop3 checks{color}
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(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> MoveWithAck#isSuccessfulScan for Region movement should use Region End Key
> for limiting scan to one region only.
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-28357
> URL: https://issues.apache.org/jira/browse/HBASE-28357
> Project: HBase
> Issue Type: Improvement
> Components: Region Assignment
> Reporter: Mihir Monani
> Assignee: Mihir Monani
> Priority: Minor
> Labels: pull-request-available
> Fix For: 2.6.0, 2.4.18, 2.5.8, 3.0.0-beta-2
>
>
> Based on recent learnings and improvements in HBase Canary in HBASE-28204 and
> HBASE-28356, I noticed that MoveWithAck.java class also uses similar code to
> check that Region is online after region move.
>
> {code:java}
> private void isSuccessfulScan(RegionInfo region) throws IOException {
> Scan scan = new
> Scan().withStartRow(region.getStartKey()).setRaw(true).setOneRowLimit()
> .setMaxResultSize(1L).setCaching(1).setFilter(new
> FirstKeyOnlyFilter()).setCacheBlocks(false); {code}
> If the region, that was moved, is empty then MoveWithAck#isSuccessfulScan()
> will end up scanning next region key space, which is not the intent. If
> multiple regions in sequence are empty, then this could create too many
> unnecessary scans. By setting withStopRow(endKeyOfRegion, false) for the
> scan object, this scan can be bound to only single region.
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