Vladimir Rodionov created HBASE-15442:
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Summary: HBase Backup Phase 2: Potential data loss and or data
duplication in incremental backup
Key: HBASE-15442
URL: https://issues.apache.org/jira/browse/HBASE-15442
Project: HBase
Issue Type: Bug
Reporter: Vladimir Rodionov
Assignee: Vladimir Rodionov
Priority: Critical
Suppose we have two tables T1 and T2
# Create full backup T1 with backup id = B1
# Create full backup T2 backupId = B2
# New data arrived into file WAL1
# Create incremental backup of T1 with backupId = B3
# Create incremental backup of T2 with backupid = B4
The directory structure for backup site after this steps
BACKUP_ROOT/WALs/B3
BACKUP_ROOT/WALs/B4
BACKUP_ROOT/T1/B1
BACKUP_ROOT/T2/B2
File WAL1 may end up either in BACKUP_ROOT/WALs/B3 or in both:
BACKUP_ROOT/WALs/B3 and BACKUP_ROOT/WALs/B4 location. Both are bad: in first
case we lose data for backup B4 in second case we have duplicate copies of WAL1
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