[SPARK-3454] separate json endpoints for data in the UI

Exposes data available in the UI as json over http. Key points: * new endpoints, handled independently of existing XyzPage classes. Root entrypoint is `JsonRootResource` * Uses jersey + jackson for routing & converting POJOs into json * tests against known results in `HistoryServerSuite` * also fixes some minor issues w/ the UI -- synchronizing on access to `StorageListener` & `StorageStatusListener`, and fixing some inconsistencies w/ the way we handle retained jobs & stages. Author: Imran Rashid <[email protected]> Closes #4435 from squito/SPARK-3454 and squashes the following commits: da1e35f [Imran Rashid] typos etc. 5e78b4f [Imran Rashid] fix rendering problems 5ae02ad [Imran Rashid] Merge branch 'master' into SPARK-3454 f016182 [Imran Rashid] change all constructors json-pojo class constructors to be private[spark] to protect us from mima-false-positives if we add fields 3347b72 [Imran Rashid] mark EnumUtil as @Private ec140a2 [Imran Rashid] create @Private cc1febf [Imran Rashid] add docs on the metrics-as-json api cbaf287 [Imran Rashid] Merge branch 'master' into SPARK-3454 56db31e [Imran Rashid] update tests for mulit-attempt 7f3bc4e [Imran Rashid] Revert "add sbt-revolved plugin, to make it easier to start & stop http servers in sbt" 67008b4 [Imran Rashid] rats 9e51400 [Imran Rashid] style c9bae1c [Imran Rashid] handle multiple attempts per app b87cd63 [Imran Rashid] add sbt-revolved plugin, to make it easier to start & stop http servers in sbt 188762c [Imran Rashid] multi-attempt 2af11e5 [Imran Rashid] Merge branch 'master' into SPARK-3454 befff0c [Imran Rashid] review feedback 14ac3ed [Imran Rashid] jersey-core needs to be explicit; move version & scope to parent pom.xml f90680e [Imran Rashid] Merge branch 'master' into SPARK-3454 dc8a7fe [Imran Rashid] style, fix errant comments acb7ef6 [Imran Rashid] fix indentation 7bf1811 [Imran Rashid] move MetricHelper so mima doesnt think its exposed; comments 9d889d6 [Imran Rashid] undo some unnecessary changes f48a7b0 [Imran Rashid] docs 52bbae8 [Imran Rashid] StorageListener & StorageStatusListener needs to synchronize internally to be thread-safe 31c79ce [Imran Rashid] asm no longer needed for SPARK_PREPEND_CLASSES b2f8b91 [Imran Rashid] @DeveloperAPI 2e19be2 [Imran Rashid] lazily convert ApplicationInfo to avoid memory overhead ba3d9d2 [Imran Rashid] upper case enums 39ac29c [Imran Rashid] move EnumUtil d2bde77 [Imran Rashid] update error handling & scoping 4a234d3 [Imran Rashid] avoid jersey-media-json-jackson b/c of potential version conflicts a157a2f [Imran Rashid] style 7bd4d15 [Imran Rashid] delete security test, since it doesnt do anything a325563 [Imran Rashid] style a9c5cf1 [Imran Rashid] undo changes superceeded by master 0c6f968 [Imran Rashid] update deps 1ed0d07 [Imran Rashid] Merge branch 'master' into SPARK-3454 4c92af6 [Imran Rashid] style f2e63ad [Imran Rashid] Merge branch 'master' into SPARK-3454 c22b11f [Imran Rashid] fix compile error 9ea682c [Imran Rashid] go back to good ol' java enums cf86175 [Imran Rashid] style d493b38 [Imran Rashid] Merge branch 'master' into SPARK-3454 f05ae89 [Imran Rashid] add in ExecutorSummaryInfo for MiMa :( 101a698 [Imran Rashid] style d2ef58d [Imran Rashid] revert changes that had HistoryServer refresh the application listing more often b136e39 [Imran Rashid] Revert "add sbt-revolved plugin, to make it easier to start & stop http servers in sbt" e031719 [Imran Rashid] fixes from review 1f53a66 [Imran Rashid] style b4a7863 [Imran Rashid] fix compile error 2c8b7ee [Imran Rashid] rats 1578a4a [Imran Rashid] doc 674f8dc [Imran Rashid] more explicit about total numbers of jobs & stages vs. number retained 9922be0 [Imran Rashid] Merge branch 'master' into stage_distributions f5a5196 [Imran Rashid] undo removal of renderJson from MasterPage, since there is no substitute yet db61211 [Imran Rashid] get JobProgressListener directly from UI fdfc181 [Imran Rashid] stage/taskList 63eb4a6 [Imran Rashid] tests for taskSummary ad27de8 [Imran Rashid] error handling on quantile values b2efcaf [Imran Rashid] cleanup, combine stage-related paths into one resource aaba896 [Imran Rashid] wire up task summary a4b1397 [Imran Rashid] stage metric distributions e48ba32 [Imran Rashid] rename eaf3bbb [Imran Rashid] style 25cd894 [Imran Rashid] if only given day, assume GMT 51eaedb [Imran Rashid] more visibility fixes 9f28b7e [Imran Rashid] ack, more cleanup 99764e1 [Imran Rashid] Merge branch 'SPARK-3454_w_jersey' into SPARK-3454 a61a43c [Imran Rashid] oops, remove accidental checkin a066055 [Imran Rashid] set visibility on a lot of classes 1f361c8 [Imran Rashid] update rat-excludes 0be5120 [Imran Rashid] Merge branch 'master' into SPARK-3454_w_jersey 2382bef [Imran Rashid] switch to using new "enum" fef6605 [Imran Rashid] some utils for working w/ new "enum" format dbfc7bf [Imran Rashid] style b86bcb0 [Imran Rashid] update test to look at one stage attempt 5f9df24 [Imran Rashid] style 7fd156a [Imran Rashid] refactor jsonDiff to avoid code duplication 73f1378 [Imran Rashid] test json; also add test cases for cleaned stages & jobs 97d411f [Imran Rashid] json endpoint for one job 0c96147 [Imran Rashid] better error msgs for bad stageId vs bad attemptId dddbd29 [Imran Rashid] stages have attempt; jobs are sorted; resource for all attempts for one stage 190c17a [Imran Rashid] StagePage should distinguish no task data, from unknown stage 84cd497 [Imran Rashid] AllJobsPage should still report correct completed & failed job count, even if some have been cleaned, to make it consistent w/ AllStagesPage 36e4062 [Imran Rashid] SparkUI needs to know about startTime, so it can list its own applicationInfo b4c75ed [Imran Rashid] fix merge conflicts; need to widen visibility in a few cases e91750a [Imran Rashid] Merge branch 'master' into SPARK-3454_w_jersey 56d2fc7 [Imran Rashid] jersey needs asm for SPARK_PREPEND_CLASSES to work f7df095 [Imran Rashid] add test for accumulables, and discover that I need update after all 9c0c125 [Imran Rashid] add accumulableInfo 00e9cc5 [Imran Rashid] more style 3377e61 [Imran Rashid] scaladoc d05f7a9 [Imran Rashid] dont use case classes for status api POJOs, since they have binary compatibility issues 654cecf [Imran Rashid] move all the status api POJOs to one file b86e2b0 [Imran Rashid] style 18a8c45 [Imran Rashid] Merge branch 'master' into SPARK-3454_w_jersey 5598f19 [Imran Rashid] delete some unnecessary code, more to go 56edce0 [Imran Rashid] style 017c755 [Imran Rashid] add in metrics now available 1b78cb7 [Imran Rashid] fix some import ordering 0dc3ea7 [Imran Rashid] if app isnt found, reload apps from FS before giving up c7d884f [Imran Rashid] fix merge conflicts 0c12b50 [Imran Rashid] Merge branch 'master' into SPARK-3454_w_jersey b6a96a8 [Imran Rashid] compare json by AST, not string cd37845 [Imran Rashid] switch to using java.util.Dates for times a4ab5aa [Imran Rashid] add in explicit dependency on jersey 1.9 -- maven wasn't happy before this 4fdc39f [Imran Rashid] refactor case insensitive enum parsing cba1ef6 [Imran Rashid] add security (maybe?) for metrics json f0264a7 [Imran Rashid] switch to using jersey for metrics json bceb3a9 [Imran Rashid] set http response code on error, some testing e0356b6 [Imran Rashid] put new test expectation files in rat excludes (is this OK?) b252e7a [Imran Rashid] small cleanup of accidental changes d1a8c92 [Imran Rashid] add sbt-revolved plugin, to make it easier to start & stop http servers in sbt 4b398d0 [Imran Rashid] expose UI data as json in new endpoints
apache · evacchi · Apr 30, 2015 · Apr 30, 2015 · Apr 30, 2015 · Apr 30, 2015
commit d49735800db27239c11478aac4b0f2ec9df91a3f
diff --git a/.rat-excludes b/.rat-excludes
@@ -74,5 +74,12 @@ logs
 .*scalastyle-output.xml
 .*dependency-reduced-pom.xml
 known_translations
+json_expectation
+local-1422981759269/*
+local-1422981780767/*
+local-1425081759269/*
+local-1426533911241/*
+local-1426633911242/*
+local-1427397477963/*
 DESCRIPTION
 NAMESPACE
diff --git a/core/pom.xml b/core/pom.xml
@@ -228,6 +228,14 @@
       <artifactId>json4s-jackson_${scala.binary.version}</artifactId>
       <version>3.2.10</version>
     </dependency>
+    <dependency>
+      <groupId>com.sun.jersey</groupId>
+      <artifactId>jersey-server</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.jersey</groupId>
+      <artifactId>jersey-core</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.apache.mesos</groupId>
       <artifactId>mesos</artifactId>

diff --git a/core/src/main/java/org/apache/spark/JobExecutionStatus.java b/core/src/main/java/org/apache/spark/JobExecutionStatus.java
@@ -17,9 +17,15 @@
 
 package org.apache.spark;
 
+import org.apache.spark.util.EnumUtil;
+
 public enum JobExecutionStatus {
   RUNNING,
   SUCCEEDED,
   FAILED,
-  UNKNOWN
+  UNKNOWN;
+
+  public static JobExecutionStatus fromString(String str) {
+    return EnumUtil.parseIgnoreCase(JobExecutionStatus.class, str);
+  }
 }
diff --git a/core/src/main/java/org/apache/spark/status/api/v1/ApplicationStatus.java b/core/src/main/java/org/apache/spark/status/api/v1/ApplicationStatus.java
@@ -0,0 +1,30 @@
+/*
+ * 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.status.api.v1;
+
+import org.apache.spark.util.EnumUtil;
+
+public enum ApplicationStatus {
+  COMPLETED,
+  RUNNING;
+
+  public static ApplicationStatus fromString(String str) {
+    return EnumUtil.parseIgnoreCase(ApplicationStatus.class, str);
+  }
+
+}
diff --git a/core/src/main/java/org/apache/spark/status/api/v1/StageStatus.java b/core/src/main/java/org/apache/spark/status/api/v1/StageStatus.java
@@ -0,0 +1,31 @@
+/*
+ * 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.status.api.v1;
+
+import org.apache.spark.util.EnumUtil;
+
+public enum StageStatus {
+  ACTIVE,
+  COMPLETE,
+  FAILED,
+  PENDING;
+
+  public static StageStatus fromString(String str) {
+    return EnumUtil.parseIgnoreCase(StageStatus.class, str);
+  }
+}
diff --git a/core/src/main/java/org/apache/spark/status/api/v1/TaskSorting.java b/core/src/main/java/org/apache/spark/status/api/v1/TaskSorting.java
@@ -0,0 +1,48 @@
+/*
+ * 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.status.api.v1;
+
+import org.apache.spark.util.EnumUtil;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public enum TaskSorting {
+  ID,
+  INCREASING_RUNTIME("runtime"),
+  DECREASING_RUNTIME("-runtime");
+
+  private final Set<String> alternateNames;
+  private TaskSorting(String... names) {
+    alternateNames = new HashSet<String>();
+    for (String n: names) {
+      alternateNames.add(n);
+    }
+  }
+
+  public static TaskSorting fromString(String str) {
+    String lower = str.toLowerCase();
+    for (TaskSorting t: values()) {
+      if (t.alternateNames.contains(lower)) {
+        return t;
+      }
+    }
+    return EnumUtil.parseIgnoreCase(TaskSorting.class, str);
+  }
+
+}
diff --git a/core/src/main/java/org/apache/spark/util/EnumUtil.java b/core/src/main/java/org/apache/spark/util/EnumUtil.java
@@ -0,0 +1,38 @@
+/*
+ * 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.util;
+
+import com.google.common.base.Joiner;
+import org.apache.spark.annotation.Private;
+
+@Private
+public class EnumUtil {
+  public static <E extends Enum<E>> E parseIgnoreCase(Class<E> clz, String str) {
+    E[] constants = clz.getEnumConstants();
+    if (str == null) {
+      return null;
+    }
+    for (E e : constants) {
+      if (e.name().equalsIgnoreCase(str)) {
+        return e;
+      }
+    }
+    throw new IllegalArgumentException(
+      String.format("Illegal type='%s'. Supported type values: %s",
+        str, Joiner.on(", ").join(constants)));
+  }
+}
diff --git a/core/src/main/scala/org/apache/spark/SparkContext.scala b/core/src/main/scala/org/apache/spark/SparkContext.scala
@@ -428,7 +428,7 @@ class SparkContext(config: SparkConf) extends Logging with ExecutorAllocationCli
     _ui =
       if (conf.getBoolean("spark.ui.enabled", true)) {
         Some(SparkUI.createLiveUI(this, _conf, listenerBus, _jobProgressListener,
-          _env.securityManager,appName))
+          _env.securityManager,appName, startTime = startTime))
       } else {
         // For tests, do not enable the UI
         None

diff --git a/core/src/main/scala/org/apache/spark/annotation/Private.java b/core/src/main/scala/org/apache/spark/annotation/Private.java
@@ -0,0 +1,41 @@
+/*
+ * 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.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * A class that is considered private to the internals of Spark -- there is a high-likelihood
+ * they will be changed in future versions of Spark.
+ *
+ * This should be used only when the standard Scala / Java means of protecting classes are
+ * insufficient.  In particular, Java has no equivalent of private[spark], so we use this annotation
+ * in its place.
+ *
+ * NOTE: If there exists a Scaladoc comment that immediately precedes this annotation, the first
+ * line of the comment must be ":: Private ::" with no trailing blank line. This is because
+ * of the known issue that Scaladoc displays only either the annotation or the comment, whichever
+ * comes first.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE, ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER,
+        ElementType.CONSTRUCTOR, ElementType.LOCAL_VARIABLE, ElementType.PACKAGE})
+public @interface Private {}
diff --git a/core/src/main/scala/org/apache/spark/deploy/history/ApplicationHistoryProvider.scala b/core/src/main/scala/org/apache/spark/deploy/history/ApplicationHistoryProvider.scala
@@ -19,15 +19,15 @@ package org.apache.spark.deploy.history
 
 import org.apache.spark.ui.SparkUI
 
-private[history] case class ApplicationAttemptInfo(
+private[spark] case class ApplicationAttemptInfo(
     attemptId: Option[String],
     startTime: Long,
     endTime: Long,
     lastUpdated: Long,
     sparkUser: String,
     completed: Boolean = false)
 
-private[history] case class ApplicationHistoryInfo(
+private[spark] case class ApplicationHistoryInfo(
     id: String,
     name: String,
     attempts: List[ApplicationAttemptInfo])

diff --git a/core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala b/core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala
@@ -17,23 +17,21 @@
 
 package org.apache.spark.deploy.history
 
-import java.io.{IOException, BufferedInputStream, FileNotFoundException, InputStream}
+import java.io.{BufferedInputStream, FileNotFoundException, IOException, InputStream}
 import java.util.concurrent.{ExecutorService, Executors, TimeUnit}
 
 import scala.collection.mutable
-import scala.concurrent.duration.Duration
 
-import com.google.common.util.concurrent.ThreadFactoryBuilder
-
-import com.google.common.util.concurrent.MoreExecutors
-import org.apache.hadoop.fs.permission.AccessControlException
+import com.google.common.util.concurrent.{MoreExecutors, ThreadFactoryBuilder}
 import org.apache.hadoop.fs.{FileStatus, Path}
+import org.apache.hadoop.fs.permission.AccessControlException
+
+import org.apache.spark.{Logging, SecurityManager, SparkConf}
 import org.apache.spark.deploy.SparkHadoopUtil
 import org.apache.spark.io.CompressionCodec
 import org.apache.spark.scheduler._
 import org.apache.spark.ui.SparkUI
 import org.apache.spark.util.{Clock, SystemClock, ThreadUtils, Utils}
-import org.apache.spark.{Logging, SecurityManager, SparkConf}
 
 /**
  * A class that provides application history from event logs stored in the file system.
@@ -151,7 +149,7 @@ private[history] class FsHistoryProvider(conf: SparkConf, clock: Clock)
             val conf = this.conf.clone()
             val appSecManager = new SecurityManager(conf)
             SparkUI.createHistoryUI(conf, replayBus, appSecManager, appId,
-              HistoryServer.getAttemptURI(appId, attempt.attemptId))
+              HistoryServer.getAttemptURI(appId, attempt.attemptId), attempt.startTime)
             // Do not call ui.bind() to avoid creating a new server for each application
           }
 

diff --git a/core/src/main/scala/org/apache/spark/deploy/history/HistoryServer.scala b/core/src/main/scala/org/apache/spark/deploy/history/HistoryServer.scala
@@ -25,6 +25,7 @@ import org.eclipse.jetty.servlet.{ServletContextHandler, ServletHolder}
 
 import org.apache.spark.{Logging, SecurityManager, SparkConf}
 import org.apache.spark.deploy.SparkHadoopUtil
+import org.apache.spark.status.api.v1.{ApplicationInfo, ApplicationsListResource, JsonRootResource, UIRoot}
 import org.apache.spark.ui.{SparkUI, UIUtils, WebUI}
 import org.apache.spark.ui.JettyUtils._
 import org.apache.spark.util.{SignalLogger, Utils}
@@ -45,7 +46,7 @@ class HistoryServer(
     provider: ApplicationHistoryProvider,
     securityManager: SecurityManager,
     port: Int)
-  extends WebUI(securityManager, port, conf) with Logging {
+  extends WebUI(securityManager, port, conf) with Logging with UIRoot {
 
   // How many applications to retain
   private val retainedApplications = conf.getInt("spark.history.retainedApplications", 50)
@@ -56,7 +57,7 @@ class HistoryServer(
       require(parts.length == 1 || parts.length == 2, s"Invalid app key $key")
       val ui = provider
         .getAppUI(parts(0), if (parts.length > 1) Some(parts(1)) else None)
-        .getOrElse(throw new NoSuchElementException())
+        .getOrElse(throw new NoSuchElementException(s"no app with key $key"))
       attachSparkUI(ui)
       ui
     }
@@ -113,6 +114,10 @@ class HistoryServer(
     }
   }
 
+  def getSparkUI(appKey: String): Option[SparkUI] = {
+    Option(appCache.get(appKey))
+  }
+
   initialize()
 
   /**
@@ -123,6 +128,9 @@ class HistoryServer(
    */
   def initialize() {
     attachPage(new HistoryPage(this))
+
+    attachHandler(JsonRootResource.getJsonServlet(this))
+
     attachHandler(createStaticHandler(SparkUI.STATIC_RESOURCE_DIR, "/static"))
 
     val contextHandler = new ServletContextHandler
@@ -160,7 +168,13 @@ class HistoryServer(
    *
    * @return List of all known applications.
    */
-  def getApplicationList(): Iterable[ApplicationHistoryInfo] = provider.getListing()
+  def getApplicationList(): Iterable[ApplicationHistoryInfo] = {
+    provider.getListing()
+  }
+
+  def getApplicationInfoList: Iterator[ApplicationInfo] = {
+    getApplicationList().iterator.map(ApplicationsListResource.appHistoryInfoToPublicAppInfo)
+  }
 
   /**
    * Returns the provider configuration to show in the listing page.

diff --git a/core/src/main/scala/org/apache/spark/deploy/master/ApplicationInfo.scala b/core/src/main/scala/org/apache/spark/deploy/master/ApplicationInfo.scala
@@ -28,7 +28,7 @@ import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.deploy.ApplicationDescription
 import org.apache.spark.util.Utils
 
-private[deploy] class ApplicationInfo(
+private[spark] class ApplicationInfo(
     val startTime: Long,
     val id: String,
     val desc: ApplicationDescription,