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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9455) Make SlotManager aware of multi slot TaskManagers
Date Wed, 26 Sep 2018 15:31:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16628942#comment-16628942

ASF GitHub Bot commented on FLINK-9455:

tillrohrmann commented on a change in pull request #6734: [FLINK-9455][RM] Add support for
multi task slot TaskExecutors
URL: https://github.com/apache/flink/pull/6734#discussion_r220613316

 File path: flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/ImmutablePendingSlotBalance.java
 @@ -0,0 +1,46 @@
+ * 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.resourcemanager.slotmanager;
+ * Immutable slot balance.
+ */
+final class ImmutablePendingSlotBalance extends PendingSlotBalance {
 Review comment:
   No a left-over from a previous implementation. Will remove it.

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> Make SlotManager aware of multi slot TaskManagers
> -------------------------------------------------
>                 Key: FLINK-9455
>                 URL: https://issues.apache.org/jira/browse/FLINK-9455
>             Project: Flink
>          Issue Type: Improvement
>          Components: Distributed Coordination, ResourceManager
>    Affects Versions: 1.5.0
>            Reporter: Till Rohrmann
>            Assignee: Till Rohrmann
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.7.0
> The {{SlotManager}} responsible for managing all available slots of a Flink cluster can
request to start new {{TaskManagers}} if it cannot fulfill a slot request. The started {{TaskManager}}
can be started with multiple slots configured but currently, the {{SlotManager}} thinks that
it will be started with a single slot. As a consequence, it might issue multiple requests
to start new TaskManagers even though a single one would be sufficient to fulfill all pending
slot requests.
> In order to avoid requesting unnecessary resources which are freed after the idle timeout,
I suggest to make the {{SlotManager}} aware of how many slots a {{TaskManager}} is started
with. That way the SlotManager only needs to request a new {{TaskManager}} if all of the previously
started slots (potentially not yet registered and, thus, future slots) are being assigned
to slot requests.

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