John Vines created ACCUMULO-571:
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Summary: MergeClone/BulkImport from existing table
Key: ACCUMULO-571
URL: https://issues.apache.org/jira/browse/ACCUMULO-571
Project: Accumulo
Issue Type: New Feature
Components: client, tserver
Reporter: John Vines
Assignee: Billie Rinaldi
This is idea that was recently brought to my attention. The use case is a user
wants to essentially clone a subset of a table into an existing table.
Currently cloning does not allow this. Current option is to copy the files in
hdfs and then bulk import, since bulk import moves the files. This is pretty
wasteful. Under the hood, the system can handle the cross-linking between files
like that. We just need a mechanism to provide the ability to assign a subset
of data to another region.
Potential uses include the above mentioned, as well as the potential for users
to bring fresh data into a table which was cloned and modified. There may be
other cases, but I haven't fully thought out this problem space.
The biggest problem with this is it does put the onus on the user for ensuring
that data in the in memory maps is flushed before moving, as well as for
handling the possibility of duplicate data.
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