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From "William Slacum (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3236) Clone table into an existing table
Date Fri, 17 Oct 2014 19:32:34 GMT


William Slacum commented on ACCUMULO-3236:

Has this discussion moved from "how should we do this" to "what should we call it?"

AFAICT we all agree on:

1) snapshotting a table's metadata
2) merging in snapshot from 1 into another table's current state

My use of "snapshot" isn't a preference-- historically I've always heard "clone" as being
"just a snapshot." I do think "clone" composition of the snapshot'ing functionality, table
creation, import, but I'm not inclined to make snapshotting a public facing API call for users.

> Clone table into an existing table
> ----------------------------------
>                 Key: ACCUMULO-3236
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client, tserver
>            Reporter: John Vines
>             Fix For: 1.7.0
> Currently we have the ability to clone a table, which takes all files belonging to an
existing table and then makes them owned by a second, brand new table. I think there is a
logic extension to this where you can add the files to an already existing table.
> One point of concern is if data is unused in existing files due to major compactions
of the shared files in the source table. This can be mitigated by either chopping the files
(which sorta goes against the idea of cloning) or ensuring that at source table splits exist
in the destination table.

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