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https://issues.apache.org/jira/browse/FLINK-4535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15458350#comment-15458350
]
ASF GitHub Bot commented on FLINK-4535:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2451#discussion_r77335961
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rpc/UnmatchedLeaderSessionIDException.java
---
@@ -0,0 +1,59 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.rpc;
+
+import java.util.UUID;
+
+/**
+ * An exception specifying that received leader session ID is not as same
as expected.
+ */
+public class UnmatchedLeaderSessionIDException extends Exception {
+
+ private static final long serialVersionUID = -3276145308053264636L;
+
+ /** expected leader session id */
+ private final UUID expectedLeaderSessionID;
+
+ /** actual leader session id */
+ private final UUID actualLeaderSessionID;
+
+ public UnmatchedLeaderSessionIDException(UUID expectedLeaderSessionID,
UUID actualLeaderSessionID) {
+ super("Unmatched leader session ID : expected " +
expectedLeaderSessionID + ", actual " + actualLeaderSessionID);
+ this.expectedLeaderSessionID = expectedLeaderSessionID;
--- End diff --
`checkNotNull`
> ResourceManager registration with TaskExecutor
> ----------------------------------------------
>
> Key: FLINK-4535
> URL: https://issues.apache.org/jira/browse/FLINK-4535
> Project: Flink
> Issue Type: Sub-task
> Components: Cluster Management
> Reporter: zhangjing
> Assignee: zhangjing
>
> When TaskExecutor register at ResourceManager, it takes the following 3 input
> parameters:
> 1. resourceManagerLeaderId: the fencing token for the ResourceManager leader
> which is kept by taskExecutor who send the registration
> 2. taskExecutorAddress: the address of taskExecutor
> 3. resourceID: The resource ID of the TaskExecutor that registers
> ResourceManager need to process the registration event based on the following
> steps:
> 1. Check whether input resourceManagerLeaderId is as same as the current
> leadershipSessionId of resourceManager. If not, it means that maybe two or
> more resourceManager exists at the same time, and current resourceManager is
> not the proper rm. so it rejects or ignores the registration.
> 2. Check whether exists a valid taskExecutor at the giving address by
> connecting to the address. Reject the registration from invalid address.
> 3. Check whether it is a duplicate registration by input resourceId, reject
> the registration
> 4. Keep resourceID and taskExecutorGateway mapping relationships, And
> optionally keep resourceID and container mapping relationships in yarn mode.
> 5. Create the connection between resourceManager and taskExecutor, and ensure
> its healthy based on heartbeat rpc calls between rm and tm ?
> 6. Send registration successful ack to the taskExecutor.
> Discussion:
> Maybe we need import errorCode or several registration decline subclass to
> distinguish the different causes of decline registration.
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