Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/15249#discussion_r82101088
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/BlacklistTracker.scala ---
@@ -0,0 +1,123 @@
+/*
+ * 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.spark.scheduler
+
+import org.apache.spark.SparkConf
+import org.apache.spark.internal.config
+import org.apache.spark.internal.Logging
+import org.apache.spark.util.Utils
+
+private[scheduler] object BlacklistTracker extends Logging {
+
+ private val DEFAULT_TIMEOUT = "1h"
+
+ /**
+ * Returns true if the blacklist is enabled, based on checking the
configuration in the following
+ * order:
+ * 1. Is it specifically enabled or disabled?
+ * 2. Is it enabled via the legacy timeout conf?
+ * 3. Use the default for the spark-master:
+ * - off for local mode
+ * - on for distributed modes (including local-cluster)
+ */
+ def isBlacklistEnabled(conf: SparkConf): Boolean = {
+ conf.get(config.BLACKLIST_ENABLED) match {
+ case Some(enabled) =>
+ enabled
+ case None =>
+ // if they've got a non-zero setting for the legacy conf, always
enable the blacklist,
+ // otherwise, use the default based on the cluster-mode (off for
local-mode, on otherwise).
+ val legacyKey = config.BLACKLIST_LEGACY_TIMEOUT_CONF.key
+ conf.get(config.BLACKLIST_LEGACY_TIMEOUT_CONF) match {
+ case Some(legacyTimeout) =>
+ if (legacyTimeout == 0) {
+ logWarning(s"Turning off blacklisting due to legacy
configuration: $legacyKey == 0")
+ false
+ } else {
+ // mostly this is necessary just for tests, since real users
that want the blacklist
+ // will get it anyway by default
+ logWarning(s"Turning on blacklisting due to legacy
configuration: $legacyKey > 0")
+ true
+ }
+ case None =>
+ // local-cluster is *not* considered local for these purposes,
we still want the
+ // blacklist enabled by default
--- End diff --
update comment (no longer enabled by default)
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