[jira] [Closed] (OAK-6246) Support for out of band indexing with read only access to NodeStore

["Davide Giannella (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-6246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Giannella closed OAK-6246.
---------------------------------

Bulk close for 1.7.4

> Support for out of band indexing with read only access to NodeStore
> -------------------------------------------------------------------
>
>                 Key: OAK-6246
>                 URL: https://issues.apache.org/jira/browse/OAK-6246
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: run
>            Reporter: Chetan Mehrotra
>            Assignee: Chetan Mehrotra
>             Fix For: 1.8, 1.7.4
>
>
> Provide support for out of band indexing where oak-run is connected in read only mode with NodeStore and indexes are stored on file system. These are then imported back by target system.
> Had a discussion with [~catholicon] and following flow was determined
> # Admin would create provision a checkpoint via CheckpointMBean
> # oak-run index is connected to NodeStore in read only mode and passed with
> #* checkpoint from previous step
> #* list of indexes which need to be reindexed
> # oak-run index logic would then proceed with reindexing. However the created index data would be stored locally. This would make use of 
> #* DirectoryFactory - OAK-6243
> #* Copy-on-write nodestore approach as being used in OAK-6220
> # Once indexing is completed it would dump all index to an output folder with some metadata
> # Then admin can copy this index data and use an MBean on the target setup to "import" it back. This import would need to
> #* Pause the current async indexers
> #* Import the external index files
> #* Bring the external indexer upto date to there respective lanes checkpoint
> #* Resume the async indexer
> The benefit of this approach is that 
> # We only need to backport the import logic. Rest all can be implemented in trunk and need not be backported. 
> # Using read-only mode allow oak-run from trunk to be safely connected to any of the old versions



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