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https://issues.apache.org/jira/browse/HBASE-28357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mihir Monani reassigned HBASE-28357:
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Assignee: Mihir Monani
> 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
>
> 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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