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/*
* 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.flink.runtime.taskmanager;
import org.apache.flink.runtime.accumulators.AccumulatorSnapshot;
import org.apache.flink.runtime.execution.ExecutionState;
import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
import org.apache.flink.api.common.JobID;
import org.apache.flink.runtime.executiongraph.IOMetrics;
import org.apache.flink.util.SerializedThrowable;
import java.io.Serializable;
/**
* This class represents an update about a task's execution state.
*
* NOTE: The exception that may be attached to the state update is
* not necessarily a Flink or core Java exception, but may be an exception
* from the user code. As such, it cannot be deserialized without a
* special class loader. For that reason, the class keeps the actual
* exception field transient and deserialized it lazily, with the
* appropriate class loader.
*/
public class TaskExecutionState implements Serializable {
private static final long serialVersionUID = 1L;
private final JobID jobID;
private final ExecutionAttemptID executionId;
private final ExecutionState executionState;
private final SerializedThrowable throwable;
/** Serialized user-defined accumulators */
private final AccumulatorSnapshot accumulators;
private final IOMetrics ioMetrics;
/**
* Creates a new task execution state update, with no attached exception and no accumulators.
*
* @param jobID
* the ID of the job the task belongs to
* @param executionId
* the ID of the task execution whose state is to be reported
* @param executionState
* the execution state to be reported
*/
public TaskExecutionState(JobID jobID, ExecutionAttemptID executionId, ExecutionState executionState) {
this(jobID, executionId, executionState, null, null, null);
}
/**
* Creates a new task execution state update, with an attached exception but no accumulators.
*
* @param jobID
* the ID of the job the task belongs to
* @param executionId
* the ID of the task execution whose state is to be reported
* @param executionState
* the execution state to be reported
*/
public TaskExecutionState(JobID jobID, ExecutionAttemptID executionId,
ExecutionState executionState, Throwable error) {
this(jobID, executionId, executionState, error, null, null);
}
/**
* Creates a new task execution state update, with an attached exception.
* This constructor may never throw an exception.
*
* @param jobID
* the ID of the job the task belongs to
* @param executionId
* the ID of the task execution whose state is to be reported
* @param executionState
* the execution state to be reported
* @param error
* an optional error
* @param accumulators
* The flink and user-defined accumulators which may be null.
*/
public TaskExecutionState(JobID jobID, ExecutionAttemptID executionId,
ExecutionState executionState, Throwable error,
AccumulatorSnapshot accumulators, IOMetrics ioMetrics) {
if (jobID == null || executionId == null || executionState == null) {
throw new NullPointerException();
}
this.jobID = jobID;
this.executionId = executionId;
this.executionState = executionState;
if (error != null) {
this.throwable = new SerializedThrowable(error);
} else {
this.throwable = null;
}
this.accumulators = accumulators;
this.ioMetrics = ioMetrics;
}
// --------------------------------------------------------------------------------------------
/**
* Gets the attached exception, which is in serialized form. Returns null,
* if the status update is no failure with an associated exception.
*
* @param userCodeClassloader The classloader that can resolve user-defined exceptions.
* @return The attached exception, or null, if none.
*/
public Throwable getError(ClassLoader userCodeClassloader) {
if (this.throwable == null) {
return null;
}
else {
return this.throwable.deserializeError(userCodeClassloader);
}
}
/**
* Returns the ID of the task this result belongs to
*
* @return the ID of the task this result belongs to
*/
public ExecutionAttemptID getID() {
return this.executionId;
}
/**
* Returns the new execution state of the task.
*
* @return the new execution state of the task
*/
public ExecutionState getExecutionState() {
return this.executionState;
}
/**
* The ID of the job the task belongs to
*
* @return the ID of the job the task belongs to
*/
public JobID getJobID() {
return this.jobID;
}
/**
* Gets flink and user-defined accumulators in serialized form.
*/
public AccumulatorSnapshot getAccumulators() {
return accumulators;
}
public IOMetrics getIOMetrics() {
return ioMetrics;
}
// --------------------------------------------------------------------------------------------
@Override
public boolean equals(Object obj) {
if (obj instanceof TaskExecutionState) {
TaskExecutionState other = (TaskExecutionState) obj;
return other.jobID.equals(this.jobID) &&
other.executionId.equals(this.executionId) &&
other.executionState == this.executionState &&
(other.throwable == null) == (this.throwable == null);
}
else {
return false;
}
}
@Override
public int hashCode() {
return jobID.hashCode() + executionId.hashCode() + executionState.ordinal();
}
@Override
public String toString() {
return String.format("TaskExecutionState jobId=%s, executionId=%s, state=%s, error=%s",
jobID, executionId, executionState,
throwable == null ? "(null)" : throwable.toString());
}
}
