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https://issues.apache.org/jira/browse/HADOOP-1668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12516833
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Raghu Angadi commented on HADOOP-1668:
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Incompatible changes in HADOOP-1134 :
- dfs.block.size should be a multiple of io.byte.per.checksum. Otherwise new
files can not be written. No changes to default config.
- DFS layout version changed from -6 to -7. As with any layout change,
existing cluster need to be finalized before upgrading the software and cluster
should be started with upgrade option after software upgrade.
- Datanode RPC protocol version changed from 7 to 8 (this may not be
considered incompatible).
I will add a link to uprade guide for this upgrade.
> add INCOMPATIBLE CHANGES section to CHANGES.txt for Hadoop 0.14
> ---------------------------------------------------------------
>
> Key: HADOOP-1668
> URL: https://issues.apache.org/jira/browse/HADOOP-1668
> Project: Hadoop
> Issue Type: Bug
> Components: documentation
> Affects Versions: 0.14.0
> Reporter: Nigel Daley
> Assignee: Nigel Daley
> Priority: Blocker
> Fix For: 0.14.0
>
>
> HADOOP-1134 and some other Jira's have introduced incompatible changes into
> Hadoop 0.14. As per HADOOP-1667 the CHANGES.txt file will include sections
> for these kind of changes for Hadoop 0.15 and beyond. As a stop gap for
> 0.14, the CHANGES.txt file needs an INCOMPATIBLE CHANGES section.
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