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https://issues.apache.org/jira/browse/FLINK-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15458030#comment-15458030
]
ASF GitHub Bot commented on FLINK-4490:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2447#discussion_r77317670
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/jobmanager/slots/SlotOwner.java
---
@@ -0,0 +1,29 @@
+/*
+ * 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.jobmanager.slots;
+
+import org.apache.flink.runtime.instance.Slot;
+
+/**
+ * Interface for components that hold slots and to which slots get
released / recycled.
+ */
+public interface SlotOwner {
+
+ boolean returnAllocatedSlot(Slot slot);
--- End diff --
JavaDocs are missing (even though the method is quite self-explanatory...)
> Decouple Slot and Instance
> --------------------------
>
> Key: FLINK-4490
> URL: https://issues.apache.org/jira/browse/FLINK-4490
> Project: Flink
> Issue Type: Sub-task
> Components: Distributed Coordination
> Reporter: Kurt Young
> Fix For: 1.2.0
>
>
> Currently, {{Slot}} and {{Instance}} holds each other. For {{Instance}}
> holding {{Slot}}, it makes sense because it reflects how many resources it
> can provide and how many are using.
> But it's not very necessary for {{Slot}} to hold {{Instance}} which it
> belongs to. It only needs to hold some connection information and gateway to
> talk to. Another downside for {{Slot}} holding {{Instance}} is that
> {{Instance}} actually contains some allocate/de-allocation logicals, it will
> be difficult if we want to do some allocation refactor without letting
> {{Slot}} noticed.
> We should abstract the connection information of {{Instance}} to let {{Slot}}
> holds. (Actually we have {{InstanceConnectionInfo}} now, but lacks of
> instance's akka gateway, maybe we can just adding the akka gateway to the
> {{InstanceConnectionInfo}})
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