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JIRA: https://issues.apache.org/jira/browse/HBASE-29104.
What changes were proposed in this pull request?
Honor Scan's maxResultSize when partial results are enabled for snapshot scans.
Preserve partial-result flags, count rows correctly for scan limits and metrics, and retain partial flags when copying Results in the mapred API.
Why are the changes needed?
Snapshot scans currently use a scanner context without size limits. Large rows can cause RowTooBigException, while increasing hbase.table.max.rowsize can increase mapper memory usage.
How was this patch tested?
mvn -B -pl hbase-mapreduce -am -Dtest=TestClientSideRegionScanner,TestResult,TestTableSnapshotInputFormatPartialResults -Dsurefire.firstPartForkCount=1 -Dsurefire.rerunFailingTestsCount=0 -Dcheckstyle.skip -Dspotbugs.skip test mvn -B -pl hbase-client,hbase-server,hbase-mapreduce spotless:check