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https://issues.apache.org/jira/browse/HDFS-7231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14180312#comment-14180312
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Suresh Srinivas edited comment on HDFS-7231 at 10/23/14 3:29 AM:
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Allen, I just rewrote the steps with additional details to clarify:
# Upgrade 2.0.5 cluster to 2.2
# Do not -finalizeUpgrade
# Install 2.4.1 binaries on the cluster machines. Start the datanodes on 2.4.1.
# Start namenode -upgrade option.
# Namenode start fails because 2.0.5 to 2.2 upgrade is still in progress
# Leave 2.4.1 DNs running
# Install binaries on NN to 2.2
# Start NN on 2.2 with no upgrade related options
So far things are clear. Then you go on to say, the following:
bq. DNs now do a partial roll-forward, rendering them unable to continue
What do you mean by this?
bq. admins manually repair version files on those broken directories
This as you know is a recipe for disaster :)
Let me ask you a question. Before you go on to 2.4.1, if you do finalize of
upgrade what happens?
was (Author: sureshms):
Allen, I just rewrote the steps with additional details to clarify:
# Upgrade 2.0.5 cluster to 2.2
# Do not -finalizeUpgrade
# Install 2.4.1 binaries on the cluster machines. Start the datanodes on 2.4.1.
# Start namenode -upgrade option.
# Namenode start fails because 2.0.5 to 2.2 upgrade is still in progress
# Leave 2.4.1 DNs running
# Install binaries on NN to 2.2
# Start NN on 2.2 with no upgrade related options
So far things are clear. Then you go on to say, the following:
bq. DNs now do a partial roll-forward, rendering them unable to continue
What do you mean by this?
bq. admins manually repair version files on those broken directories
This is as you know is a recipe for disaster.
Let me ask you a question. Before you go on to 2.4.1, if you do finalize of
upgrade what happens?
> rollingupgrade needs some guard rails
> -------------------------------------
>
> Key: HDFS-7231
> URL: https://issues.apache.org/jira/browse/HDFS-7231
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Allen Wittenauer
> Priority: Blocker
>
> See first comment.
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