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HADOOP-13159. Fix potential NPE in Metrics2 source for DecayRpcScheduler. Contributed by Xiaoyu Yao. 

(cherry picked from commit 9478484845)
(cherry picked from commit 744d5edc87)
This commit is contained in:
Xiaoyu Yao 2016-05-17 14:57:51 -07:00
parent 264c06a438
commit 937bc924cb
1 changed files with 8 additions and 7 deletions
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15
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/DecayRpcScheduler.java
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@ -206,11 +206,6 @@ public DecayRpcScheduler(int numLevels, String ns, Configuration conf) {
this.backOffResponseTimeThresholds =
parseBackOffResponseTimeThreshold(ns, conf, numLevels);
// Setup delay timer
Timer timer = new Timer();
DecayTask task = new DecayTask(this, timer);
timer.scheduleAtFixedRate(task, decayPeriodMillis, decayPeriodMillis);
// Setup response time metrics
responseTimeTotalInCurrWindow = new AtomicLongArray(numLevels);
responseTimeCountInCurrWindow = new AtomicLongArray(numLevels);
@ -223,6 +218,11 @@ public DecayRpcScheduler(int numLevels, String ns, Configuration conf) {
Preconditions.checkArgument(topUsersCount > 0,
"the number of top users for scheduler metrics must be at least 1");
// Setup delay timer
Timer timer = new Timer();
DecayTask task = new DecayTask(this, timer);
timer.scheduleAtFixedRate(task, decayPeriodMillis, decayPeriodMillis);
MetricsProxy prox = MetricsProxy.getInstance(ns, numLevels);
prox.setDelegate(this);
prox.registerMetrics2Source(ns);
@ -821,9 +821,10 @@ private void addTopNCallerSummary(MetricsRecordBuilder rb) {
final int topCallerCount = 10;
TopN topNCallers = getTopCallers(topCallerCount);
Map<Object, Integer> decisions = scheduleCacheRef.get();
for (int i=0; i < topNCallers.size(); i++) {
final int actualCallerCount = topNCallers.size();
for (int i = 0; i < actualCallerCount; i++) {
NameValuePair entry = topNCallers.poll();
String topCaller = "Top." + (topCallerCount - i) + "." +
String topCaller = "Top." + (actualCallerCount - i) + "." +
"Caller(" + entry.getName() + ")";
String topCallerVolume = topCaller + ".Volume";
String topCallerPriority = topCaller + ".Priority";