Sigma-Ma opened a new pull request, #8630:
URL: https://github.com/apache/hbase/pull/8630

   JIRA: https://issues.apache.org/jira/browse/HBASE-29798
   
   ## What changes were proposed in this pull request?
   
   Stop writing .regioninfo files 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?
   
   ```bash
   mvn -pl hbase-backup -am -DskipTests -Dcheckstyle.skip -Dspotbugs.skip 
install
   mvn -pl hbase-backup -Dtest=TestIncrementalBackupRestore,TestBackupMerge 
-Dsurefire.rerunFailingTestsCount=0 test
   ```


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