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https://issues.apache.org/jira/browse/HDFS-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423254#comment-13423254
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Suresh Srinivas commented on HDFS-3731:
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This is a problem for all releases starting from 0.21. The problem is
applicable to only the following installs, that used hflush semantics in 0.20.x
based releases.
# 0.20.203 or later releases with append turned on (includes 1.0.x releases)
# 0.20.2 + append branch releases with append turned on
Installations without append turned on is not affected since blocks being
written is not used.
> 2.0 release upgrade must handle blocks being written from 1.0
> -------------------------------------------------------------
>
> Key: HDFS-3731
> URL: https://issues.apache.org/jira/browse/HDFS-3731
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 2.0.0-alpha
> Reporter: Suresh Srinivas
> Priority: Blocker
>
> Release 2.0 upgrades must handle blocks being written to (bbw) files from 1.0
> release. Problem reported by Brahma Reddy.
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