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https://issues.apache.org/jira/browse/FLINK-7153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16234663#comment-16234663
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ASF GitHub Bot commented on FLINK-7153:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/4916#discussion_r148360937
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/Execution.java
---
@@ -126,9 +134,11 @@
/** A future that completes once the Execution reaches a terminal
ExecutionState */
private final CompletableFuture<ExecutionState> terminationFuture;
+ private final CompletableFuture<TaskManagerLocation>
taskManagerLocationFuture;
+
private volatile ExecutionState state = CREATED;
- private volatile SimpleSlot assignedResource; // once assigned,
never changes until the execution is archived
+ private final AtomicReference<SimpleSlot> assignedResource;
--- End diff --
Minor comment: Since the resource is accessed quite frequently, using a
volatile variable with an `AtomicReferenceFieldUpdater` could be good here.
> Eager Scheduling can't allocate source for ExecutionGraph correctly
> -------------------------------------------------------------------
>
> Key: FLINK-7153
> URL: https://issues.apache.org/jira/browse/FLINK-7153
> Project: Flink
> Issue Type: Bug
> Components: JobManager
> Affects Versions: 1.3.1
> Reporter: Sihua Zhou
> Assignee: Till Rohrmann
> Priority: Critical
> Fix For: 1.4.0, 1.3.3
>
>
> The ExecutionGraph.scheduleEager() function allocate for ExecutionJobVertex
> one by one via calling ExecutionJobVertex.allocateResourcesForAll(), here is
> two problem about it:
> 1. The ExecutionVertex.getPreferredLocationsBasedOnInputs will always return
> empty, cause `sourceSlot` always be null until `ExectionVertex` has been
> deployed via 'Execution.deployToSlot()'. So allocate resource base on
> prefered location can't work correctly, we need to set the slot info for
> `Execution` as soon as Execution.allocateSlotForExecution() called
> successfully?
> 2. Current allocate strategy can't allocate the slot optimize. Here is the
> test case:
> {code}
> JobVertex v1 = new JobVertex("v1", jid1);
> JobVertex v2 = new JobVertex("v2", jid2);
> SlotSharingGroup group = new SlotSharingGroup();
> v1.setSlotSharingGroup(group);
> v2.setSlotSharingGroup(group);
> v1.setParallelism(2);
> v2.setParallelism(4);
> v1.setInvokableClass(BatchTask.class);
> v2.setInvokableClass(BatchTask.class);
> v2.connectNewDataSetAsInput(v1, DistributionPattern.POINTWISE,
> ResultPartitionType.PIPELINED_BOUNDED);
> {code}
> Currently, after allocate for v1,v2, we got a local partition and three
> remote partition. But actually, it should be 2 local partition and 2 remote
> partition.
> The causes of the above problems is becuase that the current allocate
> strategy is allocate the resource for execution one by one(if the execution
> can allocate from SlotGroup than get it, Otherwise ask for a new one for it).
> If we change the allocate strategy to two step will solve this problem, below
> is the Pseudo code:
> {code}
> for (ExecutionJobVertex ejv: getVerticesTopologically) {
> //step 1: try to allocate from SlothGroup base on inputs one by one (which
> only allocate resource base on location).
> //step 2: allocate for the remain execution.
> }
> {code}
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