[jira] [Resolved] (HBASE-15442) HBase Backup Phase 2: Potential data loss and or data duplication in incremental backup

["Vladimir Rodionov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-15442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Rodionov resolved HBASE-15442.
---------------------------------------
    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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