Todd Lipcon created HDFS-3721:
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Summary: 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 write to the old cluster.
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