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https://issues.apache.org/jira/browse/HDFS-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-3721:
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Description: HDFS-744 added support for hsync to the data transfer wire
protocol. However, it actually broke wire compatibility: if the client has
hsync support but the server does not, the client cannot read or write data on
the old cluster. (was: HDFS-744 added support for hsync to the data transfer
wire protocol. However, it actually broke wire compatibility: if the client has
hsync support but the server does not, the client cannot write to the old
cluster.)
This also affects the read path, since it uses the same packet header as well
assuming it's fixed size.
> hsync support broke wire compatibility
> --------------------------------------
>
> Key: HDFS-3721
> URL: https://issues.apache.org/jira/browse/HDFS-3721
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, hdfs client
> Affects Versions: 2.1.0-alpha
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
>
> HDFS-744 added support for hsync to the data transfer wire protocol. However,
> it actually broke wire compatibility: if the client has hsync support but the
> server does not, the client cannot read or write data on the old cluster.
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