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

["Chetan Mehrotra (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-6246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16034492#comment-16034492 ] 

Chetan Mehrotra edited comment on OAK-6246 at 6/2/17 11:25 AM:
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Looks useful and worth a try. Mongo provides a [natural order sort|https://docs.mongodb.com/manual/reference/method/cursor.sort/#return-natural-order] which can be used. -When using this we should also use [exhaust option|http://api.mongodb.com/java/current/com/mongodb/Bytes.html#QUERYOPTION_EXHAUST] for the cursor-  Not supported in Java driver [JAVA-417|https://jira.mongodb.org/browse/JAVA-417]


was (Author: chetanm):
Looks useful and worth a try. Mongo provides a [natural order sort|https://docs.mongodb.com/manual/reference/method/cursor.sort/#return-natural-order] which can be used. When using this we should also use [exhaust option|http://api.mongodb.com/java/current/com/mongodb/Bytes.html#QUERYOPTION_EXHAUST] for the cursor

> 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
>
>
> 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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