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https://issues.apache.org/jira/browse/HDFS-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423182#comment-13423182
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Robert Joseph Evans commented on HDFS-3731:
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I am a bit confused by this, as I am not an expert on HDFS. I am mainly
concerned if this does impact 0.23, I assume it does, and if so what that
impact is. Does it mean that the datanode could drop the last block from a
file because that block is in a bbw file as the datanode is upgraded? You
mention HBase here, does this only impact a block that is being written to with
hsync?
> 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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