[SPARK-41525][K8S] Improve onNewSnapshots to use unique lists of known executor IDs and PVC names
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…s in onNewSnapshots
dongjoon-hyun
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onNewSnapshots
dongjoon-hyun
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onNewSnapshotsonNewSnapshots to use unique list of known executor IDs and PVC names
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cc @viirya and @attilapiros |
dongjoon-hyun
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onNewSnapshots to use unique list of known executor IDs and PVC namesonNewSnapshots to use unique list of known executor IDs and PVC names
dongjoon-hyun
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onNewSnapshots to use unique list of known executor IDs and PVC namesonNewSnapshots to use unique lists of known executor IDs and PVC names
dongjoon-hyun
commented
Dec 15, 2022
| schedulerBackend: KubernetesClusterSchedulerBackend, | ||
| snapshots: Seq[ExecutorPodsSnapshot]): Unit = { | ||
| val k8sKnownExecIds = snapshots.flatMap(_.executorPods.keys) | ||
| val k8sKnownExecIds = snapshots.flatMap(_.executorPods.keys).distinct |
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The original code is in Spark 3.1.2 and Spark 3.2.0.
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So snapshots may contain duplicates too?
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snapshots is defined as a sequence of snapshot history originally. Logically, there can be a few snapshot which the same contents, but in the most cases, they will be different by object metadata or status.
dongjoon-hyun
commented
Dec 15, 2022
| pod.getSpec.getVolumes.asScala | ||
| .flatMap { v => Option(v.getPersistentVolumeClaim).map(_.getClaimName) } | ||
| } | ||
| }.distinct |
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This is since Spark 3.2.0.
viirya
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Dec 15, 2022
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Thank you, @viirya ! |
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All tests passed except the master branch dependency test failure. Merged to master. |
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What changes were proposed in this pull request?
This PR improve
ExecutorPodsAllocator.onNewSnapshotsby removing duplications atk8sKnownExecIdsandk8sKnownPVCNames. In the large cluster, this causes inefficiency.Why are the changes needed?
The existing variables have lots of duplications because
snapshotsisSeq[ExecutorPodsSnapshot].For example, if we print out the values, it looks like the following.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Manual review because this is an improvement on the local variable computation.