DieterDP-ng commented on code in PR #5868:
URL: https://github.com/apache/hbase/pull/5868#discussion_r1589634611
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hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupManager.java:
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@@ -295,51 +298,31 @@ public ArrayList<BackupImage> getAncestors(BackupInfo
backupInfo) throws IOExcep
.withRootDir(backup.getBackupRootDir()).withTableList(backup.getTableNames())
.withStartTime(backup.getStartTs()).withCompleteTime(backup.getCompleteTs()).build();
- // Only direct ancestors for a backup are required and not entire
history of backup for this
- // table resulting in verifying all of the previous backups which is
unnecessary and backup
- // paths need not be valid beyond the lifetime of a backup.
- //
- // RootDir is way of grouping a single backup including one full and
many incremental backups
+ // If the image has a different rootDir, it cannot be an ancestor.
if (!image.getRootDir().equals(backupInfo.getBackupRootDir())) {
continue;
}
- // add the full backup image as an ancestor until the last incremental
backup
- if (backup.getType().equals(BackupType.FULL)) {
- // check the backup image coverage, if previous image could be covered
by the newer ones,
- // then no need to add
- if (!BackupManifest.canCoverImage(ancestors, image)) {
- ancestors.add(image);
- }
+ // The ancestors consist of the most recent FULL backups that cover the
list of tables
+ // required in the new backup and all INCREMENTAL backups that came
after one of those FULL
+ // backups.
+ if (backup.getType().equals(BackupType.INCREMENTAL)) {
Review Comment:
I did the following experiment:
```
echo "create 'table1', 'cf'" | bin/hbase shell -n
echo "create 'table2', 'cf'" | bin/hbase shell -n
echo "create 'table3', 'cf'" | bin/hbase shell -n
bin/hbase backup create full file:/tmp/hbasebackups -t table1,table2
echo "put 'table1', 'row1', 'cf:a', 'valueA'" | bin/hbase shell -n
echo "put 'table2', 'row1', 'cf:a', 'valueB'" | bin/hbase shell -n
bin/hbase backup create incremental file:/tmp/hbasebackups -t table1
bin/hbase backup history
{ID=backup_1714763143839,Type=INCREMENTAL,Tables={table2,table1},State=COMPLETE,Start
time=Fri May 03 21:05:44 CEST 2024,End time=Fri May 03 21:05:47 CEST
2024,Progress=100%}
{ID=backup_1714763125413,Type=FULL,Tables={table2,table1},State=COMPLETE,Start
time=Fri May 03 21:05:25 CEST 2024,End time=Fri May 03 21:05:29 CEST
2024,Progress=100%}
```
This seems to suggest that the incremental backup includes both tables, even
though I only requested table1. So I don't think it's possible to create an
incremental backup of just a single table if your FULL backups have more tables
covered?
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