Xing Lin created HDFS-17286:
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Summary: Add UDP as a transfer protocol for HDFS
Key: HDFS-17286
URL: https://issues.apache.org/jira/browse/HDFS-17286
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: Xing Lin
Right now, every connection in HDFS is based on RPC/IPC which is based on TCP.
Connection is re-used based on ConnectionID, which includes RpcTimeout as part
of the key to identify a connection. The consequence is if we want to use a
different rpc timeout between two hosts, this would create different TCP
connections.
A use case which motivated us to consider UDP is getHAServiceState() in
ObserverReadProxyProvider. We'd like getHAServiceState() to time out with a
much smaller timeout threshold and move to probe next Namenode. To support
this, we used an executorService and set a timeout for the task in HDFS-17030.
This implementation can be improved by using UDP to query HAServiceState.
getHAServiceState() does not have to be very reliable, as we can always fall
back to the active.
Another motivation is it seems 5~10% of RPC calls hitting our active/observers
are GetHAServiceState(). If we can move them off to the UDP server, that can
hopefully improve RPC latency.
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