Xinyu Tan created IOTDB-1487:
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Summary: Fix clientPool timeout in cluster module
Key: IOTDB-1487
URL: https://issues.apache.org/jira/browse/IOTDB-1487
Project: Apache IoTDB
Issue Type: Improvement
Reporter: Xinyu Tan
There's many ClientPools between nodes in cluster IoTDB that have multiple long
TCP connections managed by thrift, and when coordinator has to communicate
between nodes, it gets one client from the pool first, sends the RPC, and puts
it back into the pool.
However, There is no retention mechanism for ClientPool between nodes. When a
Thrift client is unused for a long time, its TCP connection may have been
discarded by the operating system, routers, and so on, so there is a timeout
when a client thread gets the client again for a write request. Therefore, we
need to add some application layer heartbeat preservation mechanism for long
TCP connections
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