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https://issues.apache.org/jira/browse/HDFS-5586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13895229#comment-13895229
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Kihwal Lee commented on HDFS-5586:
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HDFS-5585 is mainly for protocol and CLI changes. Other things will be hooked
up to the upgrade-shutdown command.
> Add quick-restart option for datanode
> -------------------------------------
>
> Key: HDFS-5586
> URL: https://issues.apache.org/jira/browse/HDFS-5586
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, ha, hdfs-client, namenode
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
>
> This feature, combined with the graceful shutdown feature, will enable data
> nodes to come back up and start serving quickly. This is likely a command
> line option for data node, which triggers it to look for saved state
> information in its local storage. If the information is present and
> reasonably up-to-date, data node would skip some of the startup steps.
> Ideally it should be able to do quick registration without requiring removal
> of all blocks from the date node descriptor on the name node and
> reconstructing it with the initial full block report. This implies that all
> RBW blocks are recorded during shutdown and on start-up they are not turned
> into RWR. Other than the quick registration, name node should treat the
> restart as if few heart beats were lost from the node. There should be no
> unexpected replica state changes.
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