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https://issues.apache.org/jira/browse/HDFS-11856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HDFS-11856:
------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 2.7.4
Status: Resolved (was: Patch Available)
> Ability to re-add Upgrading Nodes (remote) to pipeline for future pipeline
> updates
> ----------------------------------------------------------------------------------
>
> Key: HDFS-11856
> URL: https://issues.apache.org/jira/browse/HDFS-11856
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client, rolling upgrades
> Affects Versions: 2.7.3
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Fix For: 2.9.0, 2.7.4, 3.0.0-alpha4, 2.8.2
>
> Attachments: HDFS-11856-01.patch, HDFS-11856-02.branch-2.patch,
> HDFS-11856-02.patch, HDFS-11856-branch-2-02.patch,
> HDFS-11856-branch-2.7-02.patch, HDFS-11856-branch-2.8-02.patch
>
>
> During rolling upgrade if the DN gets restarted, then it will send special
> OOB_RESTART status to all streams opened for write.
> 1. Local clients will wait for 30 seconds to datanode to come back.
> 2. Remote clients will consider these nodes as bad nodes and continue with
> pipeline recoveries and write. These restarted nodes will be considered as
> bad, and will be excluded for lifetime of stream.
> In case of small cluster, where total nodes itself is 3, each time a remote
> node restarts for upgrade, it will be excluded.
> So a stream writing to 3 nodes initial, will end-up writing to only one node
> at the end, there are no other nodes to replace.
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