mustafaiman commented on a change in pull request #1701:
URL: https://github.com/apache/hive/pull/1701#discussion_r551753955
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/tez/DynamicPartitionPruner.java
##########
@@ -100,37 +99,19 @@
private int sourceInfoCount = 0;
- private final Object endOfEvents = new Object();
-
private int totalEventCount = 0;
- public DynamicPartitionPruner(InputInitializerContext context, MapWork work,
JobConf jobConf) throws
- SerDeException {
- this.context = context;
- this.work = work;
- this.jobConf = jobConf;
- synchronized (this) {
- initialize();
+ public void prune() throws SerDeException, IOException,
InterruptedException, HiveException {
+ if (sourcesWaitingForEvents.isEmpty()) {
+ return;
}
- }
-
- public void prune()
- throws SerDeException, IOException,
- InterruptedException, HiveException {
- synchronized(sourcesWaitingForEvents) {
Review comment:
Earlier it was neccessary because addEvent and DynamicPartitionPruner
constructor were both modifying sourcesWaitingForEvents. Now, that set is only
modified by DynamicPartitionPruner#prune (and the methods it calls).
DynamicPartitionPruner#prune is called from HiveSplitGenerator's init method
which is called only once by Tez
(https://github.com/apache/tez/blob/849e1d7694cdfd2432d631830940bc95c6f26ead/tez-dag/src/main/java/org/apache/tez/dag/app/dag/RootInputInitializerManager.java#L281).
Concurrent part is addEvent calls. addEvent calls just queue the events and
not touch any mutable state. Therefore further synchronization is not necessary.
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