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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:
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Status: Patch Available (was: Open)
> 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
> Attachments: 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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