James Clampffer created HDFS-11437:
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Summary: libhdfs++: Handler for FileSystem async connect can be
invoked before successful communication with active NN
Key: HDFS-11437
URL: https://issues.apache.org/jira/browse/HDFS-11437
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: James Clampffer
Assignee: James Clampffer
The handler provided to FileSystem::Connect can be invoked as soon as the FS
makes a connection to the standby NN rather than waiting until it connects to
the active NN. This allows RPC requests to be enqueued before a real
connection is made and if the active NN isn't reachable for some reason the
only way to cancel is to delete the FS from another thread which kills all
pending requests.
The underlying issue is that currently the only thing that must happen for the
connect handler to be invoked is a successful handshake with a NN. Connecting
to the standby NN and receiving a StandbyException satisfies this requirement
but it should wait until it is able to get a handshake from the active NN.
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