[SPARK-31422][CORE] Fix NPE when BlockManagerSource is used after BlockManagerMaster stops
### What changes were proposed in this pull request? This PR (SPARK-31422) aims to return empty result in order to avoid `NullPointerException` at `getStorageStatus` and `getMemoryStatus` which happens after `BlockManagerMaster` stops. The empty result is consistent with the current status of `SparkContext` because `BlockManager` and `BlockManagerMaster` is already stopped. ### Why are the changes needed? In `SparkEnv.stop`, the following stop sequence is used and `metricsSystem.stop` invokes `sink.stop`. ``` blockManager.master.stop() metricsSystem.stop() --> sinks.foreach(_.stop) ``` However, some sink can invoke `BlockManagerSource` and ends up with `NullPointerException` because `BlockManagerMaster` is already stopped and `driverEndpoint` became `null`. ``` java.lang.NullPointerException at org.apache.spark.storage.BlockManagerMaster.getStorageStatus(BlockManagerMaster.scala:170) at org.apache.spark.storage.BlockManagerSource$$anonfun$10.apply(BlockManagerSource.scala:63) at org.apache.spark.storage.BlockManagerSource$$anonfun$10.apply(BlockManagerSource.scala:63) at org.apache.spark.storage.BlockManagerSource$$anon$1.getValue(BlockManagerSource.scala:31) at org.apache.spark.storage.BlockManagerSource$$anon$1.getValue(BlockManagerSource.scala:30) ``` Since `SparkContext` registers and forgets `BlockManagerSource` without deregistering, we had better avoid `NullPointerException` inside `BlockManagerMaster` preventively. ```scala _env.metricsSystem.registerSource(new BlockManagerSource(_env.blockManager)) ``` ### Does this PR introduce any user-facing change? Yes. This will remove NPE for the users who uses `BlockManagerSource`. ### How was this patch tested? Pass the Jenkins with the newly added test cases. Closes #28187 from dongjoon-hyun/SPARK-31422. Authored-by: Dongjoon Hyun <dongjoon@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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@ -167,10 +167,12 @@ class BlockManagerMaster(
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* amount of remaining memory.
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*/
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def getMemoryStatus: Map[BlockManagerId, (Long, Long)] = {
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if (driverEndpoint == null) return Map.empty
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driverEndpoint.askSync[Map[BlockManagerId, (Long, Long)]](GetMemoryStatus)
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}
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def getStorageStatus: Array[StorageStatus] = {
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if (driverEndpoint == null) return Array.empty
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driverEndpoint.askSync[Array[StorageStatus]](GetStorageStatus)
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}
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@ -0,0 +1,35 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.spark.storage
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import org.junit.Assert.assertTrue
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import org.apache.spark.{SparkConf, SparkFunSuite}
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class BlockManagerMasterSuite extends SparkFunSuite {
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test("SPARK-31422: getMemoryStatus should not fail after BlockManagerMaster stops") {
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val bmm = new BlockManagerMaster(null, null, new SparkConf, true)
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assertTrue(bmm.getMemoryStatus.isEmpty)
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}
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test("SPARK-31422: getStorageStatus should not fail after BlockManagerMaster stops") {
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val bmm = new BlockManagerMaster(null, null, new SparkConf, true)
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assertTrue(bmm.getStorageStatus.isEmpty)
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}
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}
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