Andrei Budnik created MESOS-9838:
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Summary: Leaked HTTP input connection between agent and
IOSwitchboard when launched with TTY enabled.
Key: MESOS-9838
URL: https://issues.apache.org/jira/browse/MESOS-9838
Project: Mesos
Issue Type: Bug
Components: agent
Reporter: Andrei Budnik
Steps to reproduce:
1) Launch a TTY container.
2) Send the `ATTACH_CONTAINER_INPUT` request to the agent via an HTTP
connection.
3) Close a tcp socket used to send `ATTACH_CONTAINER_INPUT`.
4) Send another `ATTACH_CONTAINER_INPUT` request to the agent - it returns
`409 Conflict` HTTP error.
For each incoming `ATTACH_CONTAINER_INPUT` request the agent creates an HTTP
connection to the IOSwitchboard via unix socket. This connection is used to
retransmit client requests to the IOSwitchboard. IOSwitchboard closes this
connection automatically once the client closes its HTTP connection to the
agent: for more details see HTTP handlers in [the
agent|https://github.com/apache/mesos/blob/1961e41a61def2b7baca7563c0b7e1855880b55c/src/slave/http.cpp#L3105-L3116]
and in the
[IOSwitchboard|https://github.com/apache/mesos/blob/1961e41a61def2b7baca7563c0b7e1855880b55c/src/slave/containerizer/mesos/io/switchboard.cpp#L1665-L1758].
IOSwitchboard does not allow [multiple input
connections|https://github.com/apache/mesos/blob/1961e41a61def2b7baca7563c0b7e1855880b55c/src/slave/containerizer/mesos/io/switchboard.cpp#L1654-L1657].
Currently, IOSwitchboard does not close HTTP connection for the
`ATTACH_CONTAINER_INPUT` in the case described above. Hence, IOSwitchboard
returns an error for the subsequent attempts to attach to the container input.
The root cause needs to be found.
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