rahulrane50 commented on code in PR #2344:
URL: https://github.com/apache/helix/pull/2344#discussion_r1084406786
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helix-core/src/main/java/org/apache/helix/monitoring/mbeans/ClusterStatusMonitor.java:
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@@ -55,6 +55,54 @@
import org.slf4j.LoggerFactory;
public class ClusterStatusMonitor implements ClusterStatusMonitorMBean {
+ private class AsyncMissingTopStateMonitor extends Thread {
+ private final Map<String, Map<String, Long>> _missingTopStateResourceMap;
+ private long _missingTopStateDurationThreshold = Long.MAX_VALUE;;
+
+ public AsyncMissingTopStateMonitor(Map<String, Map<String, Long>>
missingTopStateResourceMap) {
+ _missingTopStateResourceMap = missingTopStateResourceMap;
+ }
+
+ public void setMissingTopStateDurationThreshold(long
missingTopStateDurationThreshold) {
+ _missingTopStateDurationThreshold = missingTopStateDurationThreshold;
+ }
+
+ @Override
+ public void run() {
+ try {
+ synchronized (this) {
+ while (true) {
+ while (_missingTopStateResourceMap.size() == 0) {
+ this.wait();
+ }
+ for (Iterator<Map.Entry<String, Map<String, Long>>>
resourcePartitionIt =
+ _missingTopStateResourceMap.entrySet().iterator();
resourcePartitionIt.hasNext(); ) {
+ Map.Entry<String, Map<String, Long>> resourcePartitionEntry =
resourcePartitionIt.next();
+ // Iterate over all partitions and if any partition has missing
top state greater than threshold then report
+ // it.
+ ResourceMonitor resourceMonitor =
getOrCreateResourceMonitor(resourcePartitionEntry.getKey());
+ // If all partitions of resource has top state recovered then
reset the counter
+ if (resourcePartitionEntry.getValue().isEmpty()) {
+
resourceMonitor.resetOneOrManyPartitionsMissingTopStateRealTimeGuage();
+ resourcePartitionIt.remove();
+ } else {
+ for (Long missingTopStateStartTime :
resourcePartitionEntry.getValue().values()) {
+ if (_missingTopStateDurationThreshold < Long.MAX_VALUE &&
System.currentTimeMillis() - missingTopStateStartTime >
_missingTopStateDurationThreshold) {
+
resourceMonitor.updateOneOrManyPartitionsMissingTopStateRealTimeGuage();
+ }
+ }
+ }
+ }
+ // TODO: Check if this SLEEP_TIME is correct? Thread should keep
on increasing the counter continuously until top
+ // state is recovered but it can sleep for reasonable amount of
time in between.
+ sleep(100);
Review Comment:
Just replied on last comment. So this sleep() is not related to main
conditional sleeping. This sleep is added because this for loop will
continuously increment counters on every iteration which can overflow counter
if topstate missing situation continues for long time and also it's not really
needed to increment counter for every single ms/ns. As the TODO says async
thread should continuously increment counter but with some reasonable(may be
avg topstate missing duration/4 ms or something like this) sleep in between.
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