RetryInvocationHandler should release underlying resources on close
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Key: HADOOP-7635
URL: https://issues.apache.org/jira/browse/HADOOP-7635
Project: Hadoop Common
Issue Type: Bug
Components: ipc
Affects Versions: 0.24.0
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
Fix For: 0.24.0
It is often the case that RPC invocation handlers (e.g.
{{o.a.h.ipc.WritableRpcEngine.Invoker}}) are wrapped in a
{{RetryInvocationHandler}} instance to handle RPC retry logic. Since
{{RetryInvocationHandler}} doesn't have any resources of its own, and is
incapable of releasing the resources of the wrapped {{InvocationHandler}},
users of {{RetryInvocationHandler}} must keep around a reference to the
underlying {{InvocationHandler}} only for the purpose of closing. For an
example of this, see {{o.a.h.hdfs.DFSClient}}, in particular the member
variables {{namenode}} and {{rpcNamenode}}.
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