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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-1915) TarMK failover 2.0
Date Wed, 25 Jun 2014 14:37:24 GMT

     [ https://issues.apache.org/jira/browse/OAK-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Parvulescu updated OAK-1915:
---------------------------------

    Attachment: oak-tarmk-failover.patch

attaching proposed patch. There is a small change in oak-core that I've included in the patch
so it it easier to get some initial feedback, but I'd really like to commit the change upfront
so it would be easier to work with the code.

The patch introduces a new module in oak: oak-tarmk-failover.
The idea behind it is that the slave will periodically poll the master for the head state
recordid. If this changed then a diff will be triggered which will replace the state on the
slave node. As the diff traverses  down the content tree, each segment request that is not
available locally will translate into a network request, followed by a local save.

The project also includes OSGi support, the service is activated by adding a config file.

Todos (some of them also mentioned in the readme file)
 - still WIP so the code will probably change a bit
 - some issues with the OSGi slave service, there are some repo restarts not sure why yet
 - timeout handling doesn't cover everything on both server and slave
 - error handling on the slave still has some issues (the slave hangs)
 - maybe enable compression of the segments over the wire 
 - maybe add a checksum to the segment encoder/decoder to verify the integrity of the transfer
  - slave runmode could possibly be a read-only mode (no writes permitted)

 

> TarMK failover 2.0
> ------------------
>
>                 Key: OAK-1915
>                 URL: https://issues.apache.org/jira/browse/OAK-1915
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: segmentmk
>            Reporter: Alex Parvulescu
>            Assignee: Alex Parvulescu
>         Attachments: oak-tarmk-failover.patch
>
>
> This issue will track the implementation of the TarMK failover support.



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