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JIRA: https://issues.apache.org/jira/browse/HBASE-29798
What changes were proposed in this pull request?
Stop writing
.regioninfofiles during incremental backups and copying them during backup merges. Keep table descriptors for restore.Why are the changes needed?
Restore does not use these files. Scanning regions and writing a file for each one adds unnecessary metadata I/O, which can make backups slow for tables with many regions.
How was this patch tested?
mvn -pl hbase-backup -am -DskipTests -Dcheckstyle.skip -Dspotbugs.skip install mvn -pl hbase-backup -Dtest=TestIncrementalBackupRestore,TestBackupMerge -Dsurefire.rerunFailingTestsCount=0 test