[jira] [Created] (HBASE-15469) Take snapshot by family

["Jianwei Cui (JIRA)" <ji...@apache.org>]

Jianwei Cui created HBASE-15469:
-----------------------------------

             Summary: 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


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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