[jira] [Resolved] (OAK-3122) Direct copy of the chunked data between blob stores

["Tomek Rękawek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-3122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tomek Rękawek resolved OAK-3122.
--------------------------------
    Resolution: Won't Fix

Marking as "won't fix" because it's impossible right now to direct copy MongoBlobStore to FileDataStore without touching NodeStore. The SplitBlobStore approach may be introduced in another JIRA.

> Direct copy of the chunked data between blob stores
> ---------------------------------------------------
>
>                 Key: OAK-3122
>                 URL: https://issues.apache.org/jira/browse/OAK-3122
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: core, mongomk, upgrade
>            Reporter: Tomek Rękawek
>             Fix For: 1.4
>
>
> It could be useful to have a tool that allows to copy blob chunks directly between different stores, so users can quickly migrate their data, without a need to touch the node store, consolidate binaries, etc.
> Such tool should have direct access to the methods operating on the binary blocks, implemented in the {{AbstractBlobStore}} and its subtypes:
> {code}
> void storeBlock(byte[] digest, int level, byte[] data);
> byte[] readBlockFromBackend(BlockId blockId);
> Iterator<String> getAllChunkIds(final long maxLastModifiedTime);
> {code}
> My proposal is to create a {{ChunkedBlobStore}} interface containing these methods, which can be implemented by {{FileBlobStore}} and {{MongoBlobStore}}.
> Then we can enumerate all chunk ids, read the underlying blocks from source blob store and save them in the destination.



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