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Posted to issues@ozone.apache.org by "Uma Maheswara Rao G (Jira)" <ji...@apache.org> on 2022/06/16 16:52:00 UTC

[jira] [Assigned] (HDDS-6806) EC: Implement the EC Reconstruction coordinator

     [ https://issues.apache.org/jira/browse/HDDS-6806?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uma Maheswara Rao G reassigned HDDS-6806:
-----------------------------------------

    Assignee: Uma Maheswara Rao G  (was: Mark Gui)

> EC: Implement the EC Reconstruction coordinator
> -----------------------------------------------
>
>                 Key: HDDS-6806
>                 URL: https://issues.apache.org/jira/browse/HDDS-6806
>             Project: Apache Ozone
>          Issue Type: Sub-task
>          Components: DN
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.3.0
>
>
> This Jira implemented the reconstruction coordinator logic.
> ECReconstruction coordinator re-uses the ECReconstructedStripedInputStream, ECBlockOutputStream and ContainerProcolCalls for reconstruction of a container.
> Steps are a follows:
> For a container reconstruction task, the main flow is:
>   - ListBlock from all healthy replicas
>   - calculate effective block group len for all blocks
>   - create RECOVERING containers in TargetDNs
>   -  for each block
>   -    build a ECReconstructedStripedInputStream to read healthy chunks
>   -    build a ECBlockOutputStream to write out decoded chunks
>   -      for each stripe
>   -        use ECReconstructedStripedInputStream.recoverChunks to decode chunks
>   -        use ECBlockOutputStream.write to write decoded chunks to TargetDNs
>   -    PutBlock
>   - Close RECOVERING containers in TargetDNs
>  
>  



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