bharatviswa504 commented on a change in pull request #276: HDDS-2637. Handle
LeaderNot ready exception in OzoneManager StateMachine and upgrade ratis to
latest version.
URL: https://github.com/apache/hadoop-ozone/pull/276#discussion_r353418789
##########
File path:
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/ratis/OzoneManagerRatisServer.java
##########
@@ -156,24 +159,48 @@ private OMResponse processReply(OMRequest omRequest,
RaftClientReply reply)
// NotLeader exception is thrown only when the raft server to which the
// request is submitted is not the leader. This can happen first time
// when client is submitting request to OM.
- NotLeaderException notLeaderException = reply.getNotLeaderException();
- if (notLeaderException != null) {
- throw new ServiceException(notLeaderException);
- }
- StateMachineException stateMachineException =
- reply.getStateMachineException();
- if (stateMachineException != null) {
- OMResponse.Builder omResponse = OMResponse.newBuilder();
- omResponse.setCmdType(omRequest.getCmdType());
- omResponse.setSuccess(false);
- omResponse.setMessage(stateMachineException.getCause().getMessage());
- omResponse.setStatus(parseErrorStatus(
- stateMachineException.getCause().getMessage()));
- if (LOG.isDebugEnabled()) {
- LOG.debug("Error while executing ratis request. " +
- "stateMachineException: ", stateMachineException);
+
+ if (!reply.isSuccess()) {
+ NotLeaderException notLeaderException = reply.getNotLeaderException();
+ if (notLeaderException != null) {
+ RaftPeerId suggestedLeader =
+ notLeaderException.getSuggestedLeader() != null ?
+ notLeaderException.getSuggestedLeader().getId() : null;
+ org.apache.hadoop.ozone.om.exceptions.NotLeaderException
+ notLeaderException1;
+ if (suggestedLeader != null) {
+ notLeaderException1 = new org.apache.hadoop.ozone.om.exceptions
+ .NotLeaderException(getRaftPeerId(), suggestedLeader);
+ } else {
+ notLeaderException1 =
+ new org.apache.hadoop.ozone.om.exceptions
+ .NotLeaderException(getRaftPeerId());
+ }
+ throw new ServiceException(notLeaderException1);
+ }
+
Review comment:
On high level look to ratis, NotReplicatedException is thrown for watch
requests. As we don't use any watch requests in OM, I think we should be fine,
as in our case we should never see this kind of exception. I will explore more
if some handling is needed for this still.
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