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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15469) Take snapshot by family
Date Thu, 17 Mar 2016 14:31:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15199615#comment-15199615

Matteo Bertozzi commented on HBASE-15469:

what happens if you try to clone or restore? is the table created with all the families but
those not in the snapshot will be empty?

> Take snapshot by family
> -----------------------
>                 Key: HBASE-15469
>                 URL: https://issues.apache.org/jira/browse/HBASE-15469
>             Project: HBase
>          Issue Type: Improvement
>          Components: snapshots
>    Affects Versions: 2.0.0
>            Reporter: Jianwei Cui
>         Attachments: HBASE-15469-v1.patch
> In our production environment, there are some 'wide' tables in offline cluster. The 'wide'
table has a number of families, different applications will access different families of the
table through MapReduce. When some application starting to provide online service, we need
to copy needed families from offline cluster to online cluster. For future write, the inter-cluster
replication supports setting families for table, we can use it to copy future edits for needed
families. For existed data, we can take snapshot of the table on offline cluster, then exploit
{{ExportSnapshot}} to copy snapshot to online cluster and clone the snapshot. However, we
can only take snapshot for the whole table in which many families are not needed for the application,
this will lead unnecessary data copy. I think it is useful to support taking snapshot by family,
so that we can only copy needed data.
> Possible solution to support such function:
> 1. Add family names field to the protobuf definition of {{SnapshotDescription}}
> 2. Allow to set families when taking snapshot in hbase shell, such as:
> {code}
>    snapshot 'tableName', 'snapshotName', 'FamilyA', 'FamilyB', {SKIP_FLUSH => true}
> {code}
> 3. Add family names to {{SnapshotDescription}} in client side
> 4. Read family names from {{SnapshotDescription}} in Master/Regionserver, keep only requested
families when taking snapshot for region.
> Discussions and suggestions are welcomed.

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