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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.hadoop.hdfs.server.namenode.startupprogress;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeSet;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.util.Time;
/**
* StartupProgressView is an immutable, consistent, read-only view of namenode
* startup progress. Callers obtain an instance by calling
* {@link StartupProgress#createView()} to clone current startup progress state.
* Subsequent updates to startup progress will not alter the view. This isolates
* the reader from ongoing updates and establishes a guarantee that the values
* returned by the view are consistent and unchanging across multiple related
* read operations. Calculations that require aggregation, such as overall
* percent complete, will not be impacted by mutations performed in other threads
* mid-way through the calculation.
*
* Methods that return primitive long may return {@link Long#MIN_VALUE} as a
* sentinel value to indicate that the property is undefined.
*/
@InterfaceAudience.Private
public class StartupProgressView {
private final Map phases;
/**
* Returns the sum of the counter values for all steps in the specified phase.
*
* @param phase Phase to get
* @return long sum of counter values for all steps
*/
public long getCount(Phase phase) {
long sum = 0;
for (Step step: getSteps(phase)) {
sum += getCount(phase, step);
}
return sum;
}
/**
* Returns the counter value for the specified phase and step.
*
* @param phase Phase to get
* @param step Step to get
* @return long counter value for phase and step
*/
public long getCount(Phase phase, Step step) {
StepTracking tracking = getStepTracking(phase, step);
return tracking != null ? tracking.count.get() : 0;
}
/**
* Returns overall elapsed time, calculated as time between start of loading
* fsimage and end of safemode.
*
* @return long elapsed time
*/
public long getElapsedTime() {
return getElapsedTime(phases.get(Phase.LOADING_FSIMAGE),
phases.get(Phase.SAFEMODE));
}
/**
* Returns elapsed time for the specified phase, calculated as (end - begin) if
* phase is complete or (now - begin) if phase is running or 0 if the phase is
* still pending.
*
* @param phase Phase to get
* @return long elapsed time
*/
public long getElapsedTime(Phase phase) {
return getElapsedTime(phases.get(phase));
}
/**
* Returns elapsed time for the specified phase and step, calculated as
* (end - begin) if step is complete or (now - begin) if step is running or 0
* if the step is still pending.
*
* @param phase Phase to get
* @param step Step to get
* @return long elapsed time
*/
public long getElapsedTime(Phase phase, Step step) {
return getElapsedTime(getStepTracking(phase, step));
}
/**
* Returns the optional file name associated with the specified phase, possibly
* null.
*
* @param phase Phase to get
* @return String optional file name, possibly null
*/
public String getFile(Phase phase) {
return phases.get(phase).file;
}
/**
* Returns overall percent complete, calculated by aggregating percent complete
* of all phases. This is an approximation that assumes all phases have equal
* running time. In practice, this isn't true, but there isn't sufficient
* information available to predict proportional weights for each phase.
*
* @return float percent complete
*/
public float getPercentComplete() {
if (getStatus(Phase.SAFEMODE) == Status.COMPLETE) {
return 1.0f;
} else {
float total = 0.0f;
int numPhases = 0;
for (Phase phase: phases.keySet()) {
++numPhases;
total += getPercentComplete(phase);
}
return getBoundedPercent(total / numPhases);
}
}
/**
* Returns percent complete for the specified phase, calculated by aggregating
* the counter values and totals for all steps within the phase.
*
* @param phase Phase to get
* @return float percent complete
*/
public float getPercentComplete(Phase phase) {
if (getStatus(phase) == Status.COMPLETE) {
return 1.0f;
} else {
long total = getTotal(phase);
long count = 0;
for (Step step: getSteps(phase)) {
count += getCount(phase, step);
}
return total > 0 ? getBoundedPercent(1.0f * count / total) : 0.0f;
}
}
/**
* Returns percent complete for the specified phase and step, calculated as
* counter value divided by total.
*
* @param phase Phase to get
* @param step Step to get
* @return float percent complete
*/
public float getPercentComplete(Phase phase, Step step) {
if (getStatus(phase) == Status.COMPLETE) {
return 1.0f;
} else {
long total = getTotal(phase, step);
long count = getCount(phase, step);
return total > 0 ? getBoundedPercent(1.0f * count / total) : 0.0f;
}
}
/**
* Returns all phases.
*
* @return {@code Iterable} containing all phases
*/
public Iterable getPhases() {
return EnumSet.allOf(Phase.class);
}
/**
* Returns all steps within a phase.
*
* @param phase Phase to get
* @return {@code Iterable} all steps
*/
public Iterable getSteps(Phase phase) {
return new TreeSet(phases.get(phase).steps.keySet());
}
/**
* Returns the optional size in bytes associated with the specified phase,
* possibly Long.MIN_VALUE if undefined.
*
* @param phase Phase to get
* @return long optional size in bytes, possibly Long.MIN_VALUE
*/
public long getSize(Phase phase) {
return phases.get(phase).size;
}
/**
* Returns the current run status of the specified phase.
*
* @param phase Phase to get
* @return Status run status of phase
*/
public Status getStatus(Phase phase) {
PhaseTracking tracking = phases.get(phase);
if (tracking.beginTime == Long.MIN_VALUE) {
return Status.PENDING;
} else if (tracking.endTime == Long.MIN_VALUE) {
return Status.RUNNING;
} else {
return Status.COMPLETE;
}
}
/**
* Returns the sum of the totals for all steps in the specified phase.
*
* @param phase Phase to get
* @return long sum of totals for all steps
*/
public long getTotal(Phase phase) {
long sum = 0;
for (StepTracking tracking: phases.get(phase).steps.values()) {
if (tracking.total != Long.MIN_VALUE) {
sum += tracking.total;
}
}
return sum;
}
/**
* Returns the total for the specified phase and step.
*
* @param phase Phase to get
* @param step Step to get
* @return long total
*/
public long getTotal(Phase phase, Step step) {
StepTracking tracking = getStepTracking(phase, step);
return tracking != null && tracking.total != Long.MIN_VALUE ?
tracking.total : 0;
}
/**
* Creates a new StartupProgressView by cloning data from the specified
* StartupProgress.
*
* @param prog StartupProgress to clone
*/
StartupProgressView(StartupProgress prog) {
phases = new HashMap();
for (Map.Entry entry: prog.phases.entrySet()) {
phases.put(entry.getKey(), entry.getValue().clone());
}
}
/**
* Returns elapsed time, calculated as (end - begin) if both are defined or
* (now - begin) if end is undefined or 0 if both are undefined. Begin and end
* time come from the same AbstractTracking instance.
*
* @param tracking AbstractTracking containing begin and end time
* @return long elapsed time
*/
private long getElapsedTime(AbstractTracking tracking) {
return getElapsedTime(tracking, tracking);
}
/**
* Returns elapsed time, calculated as (end - begin) if both are defined or
* (now - begin) if end is undefined or 0 if both are undefined. Begin and end
* time may come from different AbstractTracking instances.
*
* @param beginTracking AbstractTracking containing begin time
* @param endTracking AbstractTracking containing end time
* @return long elapsed time
*/
private long getElapsedTime(AbstractTracking beginTracking,
AbstractTracking endTracking) {
final long elapsed;
if (beginTracking != null && beginTracking.beginTime != Long.MIN_VALUE &&
endTracking != null && endTracking.endTime != Long.MIN_VALUE) {
elapsed = endTracking.endTime - beginTracking.beginTime;
} else if (beginTracking != null &&
beginTracking.beginTime != Long.MIN_VALUE) {
elapsed = Time.monotonicNow() - beginTracking.beginTime;
} else {
elapsed = 0;
}
return Math.max(0, elapsed);
}
/**
* Returns the StepTracking internal data structure for the specified phase
* and step, possibly null if not found.
*
* @param phase Phase to get
* @param step Step to get
* @return StepTracking for phase and step, possibly null
*/
private StepTracking getStepTracking(Phase phase, Step step) {
PhaseTracking phaseTracking = phases.get(phase);
Map steps = phaseTracking != null ?
phaseTracking.steps : null;
return steps != null ? steps.get(step) : null;
}
/**
* Returns the given value restricted to the range [0.0, 1.0].
*
* @param percent float value to restrict
* @return float value restricted to range [0.0, 1.0]
*/
private static float getBoundedPercent(float percent) {
return Math.max(0.0f, Math.min(1.0f, percent));
}
}
