Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/626#discussion_r84380547
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/coord/zk/ZKClusterCoordinator.java
---
@@ -231,31 +235,42 @@ public DrillbitEndpoint
apply(ServiceInstance<DrillbitEndpoint> input) {
Set<DrillbitEndpoint> unregisteredBits = new HashSet<>(endpoints);
unregisteredBits.removeAll(newDrillbitSet);
+ // Set of newly live bits : new set of active bits - original bits.
+ Set<DrillbitEndpoint> registeredBits = new HashSet<>(newDrillbitSet);
+ registeredBits.removeAll(endpoints);
+
endpoints = newDrillbitSet;
if (logger.isDebugEnabled()) {
StringBuilder builder = new StringBuilder();
builder.append("Active drillbit set changed. Now includes ");
builder.append(newDrillbitSet.size());
- builder.append(" total bits. New active drillbits: \n");
- for (DrillbitEndpoint bit: newDrillbitSet) {
- builder.append('\t');
- builder.append(bit.getAddress());
- builder.append(':');
- builder.append(bit.getUserPort());
- builder.append(':');
- builder.append(bit.getControlPort());
- builder.append(':');
- builder.append(bit.getDataPort());
- builder.append('\n');
+ builder.append(" total bits.");
+ if (!newDrillbitSet.isEmpty()) {
+ builder.append(" New active drillbits: \n");
+ for (DrillbitEndpoint bit: newDrillbitSet) {
+ builder.append('\t');
+ builder.append(bit.getAddress());
+ builder.append(':');
+ builder.append(bit.getUserPort());
+ builder.append(':');
+ builder.append(bit.getControlPort());
+ builder.append(':');
+ builder.append(bit.getDataPort());
+ builder.append('\n');
+ }
+ logger.debug(builder.toString());
}
- logger.debug(builder.toString());
}
- // Notify the drillbit listener for newly unregistered bits. For
now, we only care when drillbits are down / unregistered.
- if (! (unregisteredBits.isEmpty()) ) {
+ // Notify the drillbit listener for newly unregistered bits.
+ if (!(unregisteredBits.isEmpty())) {
drillbitUnregistered(unregisteredBits);
}
+ // Notify the drillbit listener for newly registered bits.
+ if (!(registeredBits.isEmpty())) {
+ drillbitRegistered(registeredBits);
--- End diff --
Are all callbacks empty blocks?
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