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Date: Thu, 10 Apr 2014 22:46:24 +0000 (UTC)
From: "Matteo Bertozzi (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12706227.1396457323788.96755.1397169984895@arcas>
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References: <JIRA.12706227.1396457323788@arcas>
Subject: [jira] [Commented] (HBASE-10900) FULL table backup and restore
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    [ https://issues.apache.org/jira/browse/HBASE-10900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13965954#comment-13965954 ] 

Matteo Bertozzi commented on HBASE-10900:
-----------------------------------------

{quote}most of the code will be on client-side{quote}
should we aim to merge the code in the server?
with some refactor I guess we can merge the backup and snapshot code, and expose the "take full backup" and "take delta backup" as rpc. 

{quote}Also there are a couple enhancements : Jerry's global flush HBase-10926 and global logroll(jira not open yet){quote}
I guess the code for keeping the WALS is something like this
 * STEP-1: Call the Global Log-Roll
 * STEP-2: Copy Each log in the log directory
how do you ensure that the log is not remove between STEP-1 and STEP-2?
also not having connection on the server side, means that you are making a copy of the WAL and not just keeping a "reference". Don't you want to force a copy just on export?

> FULL table backup and restore
> -----------------------------
>
>                 Key: HBASE-10900
>                 URL: https://issues.apache.org/jira/browse/HBASE-10900
>             Project: HBase
>          Issue Type: Task
>            Reporter: Demai Ni
>            Assignee: Demai Ni
>             Fix For: 1.0.0
>
>         Attachments: HBASE-10900-fullbackup-trunk-v1.patch
>
>
> h2. Feature Description
> This is a subtask of [HBase-7912|https://issues.apache.org/jira/browse/HBASE-7912] to support FULL backup/restore, and will complete the following function:
> {code:title=Backup Restore example|borderStyle=solid}
> /* backup from sourcecluster to targetcluster                                  */
> /* if no table name specified, all tables from source cluster will be backuped */
> [sourcecluster]$ hbase backup create full hdfs://hostname.targetcluster.org:9000/userid/backupdir t1_dn,t2_dn,t3_dn
> /* restore on targetcluser, this is a local restore                                             */
> /* backup_1396650096738 - backup image name                                                     */
> /* t1_dn,etc are the original table names. All tables will be restored if not specified         */
> /* t1_dn_restore, etc. are the restored table. if not specified, orginal table name will be used*/
> [targetcluster]$ hbase restore /userid/backupdir backup_1396650096738 t1_dn,t2_dn,t3_dn t1_dn_restore,t2_dn_restore,t3_dn_restore
> /* restore from targetcluster back to source cluster, this is a remote restore
> [sourcecluster]$ hbase restore hdfs://hostname.targetcluster.org:9000/userid/backupdir backup_1396650096738 t1_dn,t2_dn,t3_dn t1_dn_restore,t2_dn_restore,t3_dn_restore
> {code}
> h2. Detail layout and frame work for the next jiras
> The patch is a wrapper of the existing snapshot and exportSnapshot, and will use as the base framework for the over-all solution of  [HBase-7912|https://issues.apache.org/jira/browse/HBASE-7912] as described below:
> * *bin/hbase*          : end-user command line interface to invoke BackupClient and RestoreClient
> * *BackupClient.java*  : 'main' entry for backup operations. This patch will only support 'full' backup. In future jiras, will support:
> ** *create* incremental backup
> ** *cancel* an ongoing backup
> ** *delete* an exisitng backup image
> ** *describe* the detailed informaiton of backup image
> ** show *history* of all successful backups 
> ** show the *status* of the latest backup request
> ** *convert* incremental backup WAL files into HFiles.  either on-the-fly during create or after create
> ** *merge* backup image
> ** *stop* backup a table of existing backup image
> ** *show* tables of a backup image 
> * *BackupCommands.java* : a place to keep all the command usages and options
> * *BackupManager.java*  : handle backup requests on server-side, create BACKUP ZOOKEEPER nodes to keep track backup. The timestamps kept in zookeeper will be used for future incremental backup (not included in this jira). Create BackupContext and DispatchRequest. 
> * *BackupHandler.java*  : in this patch, it is a wrapper of snapshot and exportsnapshot. In future jiras, 
> ** *timestamps* info will be recorded in ZK
> ** carry on *incremental* backup.  
> ** update backup *progress*
> ** set flags of *status*
> ** build up *backupManifest* file(in this jira only limited info for fullback. later on, timestamps and dependency of multipl backup images are also recorded here)
> ** clean up after *failed* backup 
> ** clean up after *cancelled* backup
> ** allow on-the-fly *convert* during incremental backup 
> * *BackupContext.java* : encapsulate backup information like backup ID, table names, directory info, phase, TimeStamps of backup progress, size of data, ancestor info, etc. 
> * *BackupCopier.java*  : the copying operation.  Later on, to support progress report and mapper estimation; and extends DisCp for progress updating to ZK during backup. 
> * *BackupExcpetion.java*: to handle exception from backup/restore
> * *BackupManifest.java* : encapsulate all the backup image information. The manifest info will be bundled as manifest file together with data. So that each backup image will contain all the info needed for restore. 
> * *BackupStatus.java*   : encapsulate backup status at table level during backup progress
> * *BackupUtil.java*     : utility methods during backup process
> * *RestoreClient.java*  : 'main' entry for restore operations. This patch will only support 'full' backup. 
> * *RestoreUtil.java*    : utility methods during restore process
> * *ExportSnapshot.java* : remove 'final' so that another class SnapshotCopy.java can extends from it
> * *SnapshotCopy.java*   : only a wrapper at this moment. But will be extended to keep track progress(maybe should implemented in ExportSnapshot directly?)
> * *HConstants.java*     : add the constants used by backup/restore code.
> h2. Questions for your inputs
> * currently, the code is under *hbase-sever* because it already contain a package name called 'backup'. Another place is *hbase-client*. Any prefereence?
> * Is bin/hbase the right place as CLI interface? another place would be hbase shell. 


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