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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670509#comment-13670509
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Sanjay Radia commented on HADOOP-9517:
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bq. wrt HDFS upgrade the current prose is not clear whether we permit HDFS
metadata upgrades w/in minor release or not. ..... and explicitly say that
metadata upgrades may only be required for major version upgrades?
Agreed that it is not clear. Given that the conversion is automatic, do we want
to allow metadata *AND data* changes in minor releases ? Or are we trying to
say that rolling upgrades are always possible in minor releases and hence we
don't want to allow metadata and data changes? Note although we have not
figured out how to do rolling upgrades when there are metadata changes, it may
be possible to do so. BTW -upgrade is often used even when there are no
metadata or data changes as a safety measure.
bq. Let's clearly distinguish between HDFS upgrades (ie just upgrading the HDFS
bits) from an HDFS metadata upgrade,
Given that this is in the data section I thought it was obvious. Lets modify
the "Data" Section to start by saying that we are not talking about the
executable bits.
bq. Also, what does "automatic conversion" mean, that the HDFS metadata upgrade
process can automatically convert the old version to the new? As opposed to
requiring a user manually perform multiple such upgrades?
Doesn't the word "automatic" clarify this? Again suggest some text improvements
and we can put it in.
> Document Hadoop Compatibility
> -----------------------------
>
> Key: HADOOP-9517
> URL: https://issues.apache.org/jira/browse/HADOOP-9517
> Project: Hadoop Common
> Issue Type: Bug
> Components: documentation
> Reporter: Arun C Murthy
> Assignee: Karthik Kambatla
> Attachments: hadoop-9517.patch, hadoop-9517.patch, hadoop-9517.patch,
> hadoop-9517.patch, hadoop-9517-proposal-v1.patch,
> hadoop-9517-proposal-v1.patch
>
>
> As we get ready to call hadoop-2 stable we need to better define 'Hadoop
> Compatibility'.
> http://wiki.apache.org/hadoop/Compatibility is a start, let's document
> requirements clearly and completely.
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