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https://issues.apache.org/jira/browse/HBASE-7912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13958402#comment-13958402
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Matteo Bertozzi commented on HBASE-7912:
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{quote}The snapshot information and data is tightly coupled and stored with the
existing HBase cluster -- in-place backup. We want to backup HBase data to
FileSystem cross clusters and possible other storage media or servers.{quote}
How ExportSnapshot is not enabling this?
{quote}Full backup and restore. Backup will first invoke HBase snapshot and
export snapshot internally.
The full backup can be restored with HBase bulk import utility.{quote}
What does "internally" means?
{quote}Incremental backup uses WALs to capture the data changes since last full
backup or incremental
backup. We execute roll log across region servers to track the WALs that need
to be in the backup.
Then a distributed copy is used to move the physical files to target
FileSystem.{quote}
When the logs are copied are also splitted to avoid to send tables that are not
part of the backup or is just a file copy?
Is a "Full backup" just a snapshot?
Where the backup manifests will be stored? I guess they must stay on the source
cluster to allow you to implement the "wal cleaner" to keep around logs for
Incremental backup.
how do you decide for how log keep logs for a possible incoming Incremental
Backup?
how do you decide when is better doing an Incremental Backup as a full backup
(e.g. Major compaction happened) vs just keeping the WAL?
from the document looks like that you are triying to build a separate system
that can produce the same result of the current snapshot (aside of the
"extensions"). I think you should aim to "merge" the snapshot code inside of
the Backup Manager & co, since as far as I understand by doing a full backup
you basically get the snapshot, and also you half rely on ExportSnapshot.
> HBase Backup/Restore Based on HBase Snapshot
> --------------------------------------------
>
> Key: HBASE-7912
> URL: https://issues.apache.org/jira/browse/HBASE-7912
> Project: HBase
> Issue Type: Sub-task
> Reporter: Richard Ding
> Assignee: Richard Ding
> Attachments: HBaseBackupRestore-Jira-7912-DesignDoc-v1.pdf,
> HBase_BackupRestore-Jira-7912-CLI-v1.pdf
>
>
> Finally, we completed the implementation of our backup/restore solution, and
> would like to share with community through this jira.
> We are leveraging existing hbase snapshot feature, and provide a general
> solution to common users. Our full backup is using snapshot to capture
> metadata locally and using exportsnapshot to move data to another cluster;
> the incremental backup is using offline-WALplayer to backup HLogs; we also
> leverage global distribution rolllog and flush to improve performance; other
> added-on values such as convert, merge, progress report, and CLI commands. So
> that a common user can backup hbase data without in-depth knowledge of hbase.
> Our solution also contains some usability features for enterprise users.
> The detail design document and CLI command will be attached in this jira. We
> plan to use 10~12 subtasks to share each of the following features, and
> document the detail implement in the subtasks:
> * *Full Backup* : provide local and remote back/restore for a list of tables
> * *offline-WALPlayer* to convert HLog to HFiles offline (for incremental
> backup)
> * *distributed* Logroll and distributed flush
> * Backup *Manifest* and history
> * *Incremental* backup: to build on top of full backup as daily/weekly backup
> * *Convert* incremental backup WAL files into hfiles
> * *Merge* several backup images into one(like merge weekly into monthly)
> * *add and remove* table to and from Backup image
> * *Cancel* a backup process
> * backup progress *status*
> * full backup based on *existing snapshot*
> *-------------------------------------------------------------------------------------------------------------*
> *Below is the original description, to keep here as the history for the
> design and discussion back in 2013*
> There have been attempts in the past to come up with a viable HBase
> backup/restore solution (e.g., HBASE-4618). Recently, there are many
> advancements and new features in HBase, for example, FileLink, Snapshot, and
> Distributed Barrier Procedure. This is a proposal for a backup/restore
> solution that utilizes these new features to achieve better performance and
> consistency.
>
> A common practice of backup and restore in database is to first take full
> baseline backup, and then periodically take incremental backup that capture
> the changes since the full baseline backup. HBase cluster can store massive
> amount data. Combination of full backups with incremental backups has
> tremendous benefit for HBase as well. The following is a typical scenario
> for full and incremental backup.
> # The user takes a full backup of a table or a set of tables in HBase.
> # The user schedules periodical incremental backups to capture the changes
> from the full backup, or from last incremental backup.
> # The user needs to restore table data to a past point of time.
> # The full backup is restored to the table(s) or to different table name(s).
> Then the incremental backups that are up to the desired point in time are
> applied on top of the full backup.
> We would support the following key features and capabilities.
> * Full backup uses HBase snapshot to capture HFiles.
> * Use HBase WALs to capture incremental changes, but we use bulk load of
> HFiles for fast incremental restore.
> * Support single table or a set of tables, and column family level backup and
> restore.
> * Restore to different table names.
> * Support adding additional tables or CF to backup set without interruption
> of incremental backup schedule.
> * Support rollup/combining of incremental backups into longer period and
> bigger incremental backups.
> * Unified command line interface for all the above.
> The solution will support HBase backup to FileSystem, either on the same
> cluster or across clusters. It has the flexibility to support backup to
> other devices and servers in the future.
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