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https://issues.apache.org/jira/browse/HBASE-15442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Rodionov resolved HBASE-15442.
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Resolution: Fixed
part of HBASE-14123 v12 patch
> 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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