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https://issues.apache.org/jira/browse/HDFS-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250956#comment-13250956
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Todd Lipcon commented on HDFS-3245:
-----------------------------------
Proposed contents of the web UI:
- Summary at the top: Indicates either "All versions in the cluster are
consistent" or "Rolling upgrade in progress - some nodes have mismatched
versions."
- Per-version summary. For each version, list:
-- Number of DNs with this version
-- If the number is fewer than 10, list their addresses.
-- NNs with this version (list addresses)
Versions should of course be sorted, newest at the top
Proposed metrics:
- distinct_version_count (number of distinct versions in the cluster)
- tagged metrics for each version, indicating number of nodes with that version
Any others?
> Add metrics and web UI for cluster version summary
> --------------------------------------------------
>
> Key: HDFS-3245
> URL: https://issues.apache.org/jira/browse/HDFS-3245
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 2.0.0
> Reporter: Todd Lipcon
>
> With the introduction of protocol compatibility, once HDFS-2983 is committed,
> we have the possibility that different nodes in a cluster are running
> different software versions. To aid operators, we should add the ability to
> summarize the status of versions in the cluster, so they can easily determine
> whether a rolling upgrade is in progress or if some nodes "missed" an upgrade
> (eg maybe they were out of service when the software was updated)
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