Ivan Andika created HDDS-14379:
----------------------------------
Summary: Implement basic client proxy provider to read from
followers
Key: HDDS-14379
URL: https://issues.apache.org/jira/browse/HDDS-14379
Project: Apache Ozone
Issue Type: New Feature
Reporter: Ivan Andika
Assignee: Ivan Andika
This task is to come up with the basic implementation of follower read client
proxy as a baseline before further performance improvements. The idea is to
simply pick a OM node in random (which be leader or follower / listener) and
use it to submit read requests. If the chosen OM node is a follower, the read
requests need to keep sending to that OM node unless the OM is down which
triggers failover. Write requests should be sent to the OM leader directly.
Further improvements such as adding OM probe logic will be implemented in
follow up tasks.
The implementation is to introduce HadoopRpcOMFollowerReadProxyProvider which
wraps
HadoopRpcOMFailoverProxyProvider. FollowerReadProxyProvider tracks a different
currentOmNodeId from HadoopRpcOMFailoverProxyProvider.
FollowerReadInvocationHandler will check whether the request is a read request
(using OmUtils#isReadOnly) and if so forwards it to its current proxy. If it's
a write request, the request if forwarded to HadoopRpcOMFailoverProxyProvider
to be sent to the leader.
So the proxy hierarchy is * RetryProxy
** HadoopRpcOMFollowerReadProxyProvider
*** HadoopRpcOMFailoverProxyProvider
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
