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https://issues.apache.org/jira/browse/HDFS-12070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HDFS-12070:
------------------------------
    Attachment: HDFS-12070.0.patch

> Failed block recovery leaves files open indefinitely and at risk for data loss
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-12070
>                 URL: https://issues.apache.org/jira/browse/HDFS-12070
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Kihwal Lee
>            Priority: Major
>         Attachments: HDFS-12070.0.patch, lease.patch
>
>
> Files will remain open indefinitely if block recovery fails which creates a 
> high risk of data loss.  The replication monitor will not replicate these 
> blocks.
> The NN provides the primary node a list of candidate nodes for recovery which 
> involves a 2-stage process. The primary node removes any candidates that 
> cannot init replica recovery (essentially alive and knows about the block) to 
> create a sync list.  Stage 2 issues updates to the sync list – _but fails if 
> any node fails_ unlike the first stage.  The NN should be informed of nodes 
> that did succeed.
> Manual recovery will also fail until the problematic node is temporarily 
> stopped so a connection refused will induce the bad node to be pruned from 
> the candidates.  Recovery succeeds, the lease is released, under replication 
> is fixed, and block is invalidated from the bad node.



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