[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user StephanEwen commented on the pull request: https://github.com/apache/flink/pull/1537#issuecomment-174491828 Good fix. I think if we want to be on the super safe side, actually all tasks should always report back to the JobManager that they received the "TriggerCheckpoint" message (either Ack or Decline). The CheckpointCoordinator would then "ask" the TaskManagers and would cancel the checkpoint if some of the asks time out (3-5 secs or so). That way, lost messages are properly accounted for. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user aljoscha commented on the pull request: https://github.com/apache/flink/pull/1537#issuecomment-174505573 @senorcarbone Yes, it works correctly with the timeouts, the job can just hang for a long time, especially in tests this occurred several times. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user StephanEwen commented on the pull request: https://github.com/apache/flink/pull/1537#issuecomment-174521106 The default timeout is 10 minutes. That is too long time to recognize that a checkpoint was started pre-maturely ;-) --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user senorcarbone commented on the pull request: https://github.com/apache/flink/pull/1537#issuecomment-174500162 Looks cool. Just so I understand exactly, what is wrong again if the Coordinator simply aborts expired checkpoint attempts? Wouldn't the protocol be the same, with less messages? If a task is not ready it can simply discard the checkpoint request which will eventually time out at the Coordinator. The Coordinator attempts might potentially keep timing out but there will be a complete snapshot eventually when all tasks are ready. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user StephanEwen commented on the pull request: https://github.com/apache/flink/pull/1537#issuecomment-174523012 Normally (except in this kind of situation), checkpoints progress and need no aggressive timeout as a guard. On the other hand, full checkpoints with huge state (for example when re-running a streaming job on historic data) may once in a while take long (when the network is congested or so) and we did not want to overaggressively kill the pending checkpoints in that case. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user uce commented on a diff in the pull request: https://github.com/apache/flink/pull/1537#discussion_r50669903 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/CheckpointCoordinator.java --- @@ -505,6 +506,88 @@ else if (pendingCheckpoints.size() >= maxConcurrentCheckpointAttempts) { } /** +* Receives a {@link DeclineCheckpoint} message and returns whether the +* message was associated with a pending checkpoint. +* +* @param message Checkpoint decline from the task manager +* +* @return Flag indicating whether the declined checkpoint was associated +* with a pending checkpoint. +*/ + + public boolean receiveDeclineMessage(DeclineCheckpoint message) throws Exception { + if (shutdown || message == null) { + return false; + } + if (!job.equals(message.getJob())) { + LOG.error("Received DeclineCheckpoint message for wrong job: {}", message); + return false; + } + + final long checkpointId = message.getCheckpointId(); + + CompletedCheckpoint completed = null; + PendingCheckpoint checkpoint; + + // Flag indicating whether the ack message was for a known pending + // checkpoint. + boolean isPendingCheckpoint; + + synchronized (lock) { + // we need to check inside the lock for being shutdown as well, otherwise we + // get races and invalid error log messages + if (shutdown) { + return false; + } + + checkpoint = pendingCheckpoints.get(checkpointId); + + if (checkpoint != null && !checkpoint.isDiscarded()) { + isPendingCheckpoint = true; + + LOG.info("Discarding checkpoint " + checkpointId + + " because of checkpoint decline from task " + message.getTaskExecutionId()); + + pendingCheckpoints.remove(checkpointId); + checkpoint.discard(userClassLoader); + rememberRecentCheckpointId(checkpointId); + + boolean haveMoreRecentPending = false; + Iterator> entries = pendingCheckpoints.entrySet().iterator(); + while (entries.hasNext()) { + PendingCheckpoint p = entries.next().getValue(); + if (!p.isDiscarded() && p.getCheckpointTimestamp() >= checkpoint.getCheckpointTimestamp()) { + haveMoreRecentPending = true; + break; + } + } + if (!haveMoreRecentPending && !triggerRequestQueued) { + LOG.info("Triggering new checkpoint because of discarded checkpoint " + checkpointId); + triggerCheckpoint(System.currentTimeMillis()); + } else if (!haveMoreRecentPending) { + LOG.info("Promoting queued checkpoint request because of discarded checkpoint " + checkpointId); + triggerQueuedRequests(); + } + --- End diff -- empty line --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
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: --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user aljoscha commented on the pull request: https://github.com/apache/flink/pull/1537#issuecomment-174448455 Ok, I'm addressing the comments about code-style and merging. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user gyfora commented on the pull request: https://github.com/apache/flink/pull/1537#issuecomment-174438711 Looks good to me! This is a critical fix :+1: --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user rmetzger commented on the pull request: https://github.com/apache/flink/pull/1537#issuecomment-174446152 I tested this as well. A Kafka test was previously failing, now its passing. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user uce commented on a diff in the pull request: https://github.com/apache/flink/pull/1537#discussion_r50670120 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/taskmanager/Task.java --- @@ -854,7 +855,8 @@ private void notifyObservers(ExecutionState newState, Throwable error) { // /** -* Calls the invokable to trigger a checkpoint, if the invokable implements the interface +* Calls the invokable to trigger a checkpoint, i +* f the invokable implements the interface --- End diff -- line break --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
Github user aljoscha closed the pull request at: https://github.com/apache/flink/pull/1537 --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---
[GitHub] flink pull request: [FLINK-3261] Allow Task to decline checkpoint ...
GitHub user aljoscha opened a pull request: https://github.com/apache/flink/pull/1537 [FLINK-3261] Allow Task to decline checkpoint request if not ready Before, it could happen that a StreamingTask receives a Checkpoint Trigger message while internally not being ready. The checkpoint coordinator would then wait the specified timeout interval before continuing. Now, tasks can signal that they are not ready and the checkpoint coordinator will dicard a checkpoint for which is this the case and trigger new checkpoints if necessary. The newly triggered checkpoints will also release alignment locks in streaming tasks that are still waiting for barriers from failed checkpoints. You can merge this pull request into a Git repository by running: $ git pull https://github.com/aljoscha/flink checkpoint-coordinator-decline Alternatively you can review and apply these changes as the patch at: https://github.com/apache/flink/pull/1537.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #1537 commit c759e2a0a2a1310467c25d84912544abaf5ab29e Author: Aljoscha KrettekDate: 2016-01-21T16:21:09Z [FLINK-3261] Allow Task to decline checkpoint request if not ready Before, it could happen that a StreamingTask receives a Checkpoint Trigger message while internally not being ready. The checkpoint coordinator would then wait the specified timeout interval before continuing. Now, tasks can signal that they are not ready and the checkpoint coordinator will dicard a checkpoint for which is this the case and trigger new checkpoints if necessary. The newly triggered checkpoints will also release alignment locks in streaming tasks that are still waiting for barriers from failed checkpoints. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---