HDFS side of HADOOP-6904: first step towards inter-version communications
between dfs client and NameNode
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Key: HDFS-1335
URL: https://issues.apache.org/jira/browse/HDFS-1335
Project: Hadoop HDFS
Issue Type: New Feature
Components: hdfs client, name-node
Affects Versions: 0.22.0
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.22.0
The idea is that for getProtocolVersion, NameNode checks if the client and
server versions are compatible if the server version is greater than the client
version. If no, throws a VersionIncompatible exception; otherwise, returns the
server version.
On the dfs client side, when creating a NameNode proxy, catches the
VersionMismatch exception and then checks if the client version and the server
version are compatible if the client version is greater than the server
version. If not compatible, throws exception VersionIncomptible; otherwise,
records the server version and continues.
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