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https://issues.apache.org/jira/browse/FLINK-3261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15114945#comment-15114945
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ASF GitHub Bot commented on FLINK-3261:
---------------------------------------
Github user uce commented on a diff in the pull request:
https://github.com/apache/flink/pull/1537#discussion_r50670074
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/messages/checkpoint/DeclineCheckpoint.java
---
@@ -0,0 +1,74 @@
+/*
+ * 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.messages.checkpoint;
+
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
+
+/**
+ * This message is sent from the {@link
org.apache.flink.runtime.taskmanager.TaskManager} to the
+ * {@link org.apache.flink.runtime.jobmanager.JobManager} to tell the
checkpoint coordinator
+ * that a checkpoint request could not be heeded. This can happen if a
Task is already in
--- End diff --
I had to look up `heeded` :stuck_out_tongue_winking_eye:
> Tasks should eagerly report back when they cannot start a checkpoint
> --------------------------------------------------------------------
>
> Key: FLINK-3261
> URL: https://issues.apache.org/jira/browse/FLINK-3261
> Project: Flink
> Issue Type: Bug
> Components: Distributed Runtime
> Affects Versions: 0.10.1
> Reporter: Stephan Ewen
> Assignee: Aljoscha Krettek
> Priority: Blocker
> Fix For: 1.0.0
>
>
> With very fast checkpoint intervals (few 100 msecs), it can happen that a
> Task is not ready to start a checkpoint by the time it gets the first
> checkpoint trigger message.
> If some other tasks are ready already and commence a checkpoint, the stream
> alignment will make the non-participating task wait until the checkpoint
> expires (default: 10 minutes).
> A simple way to fix this is that tasks report back when they could not start
> a checkpoint. The checkpoint coordinator can then abort that checkpoint and
> unblock the streams by starting new checkpoint (where all tasks will
> participate).
> An optimization would be to send a special "abort checkpoints barrier" that
> tells the barrier buffers for stream alignment to unblock a checkpoint.
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