shalinmangar commented on a change in pull request #2004:
URL: https://github.com/apache/lucene-solr/pull/2004#discussion_r508473818
##########
File path: solr/core/src/java/org/apache/solr/update/SolrCoreState.java
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@@ -86,7 +103,45 @@ public boolean decrefSolrCoreState(IndexWriterCloser
closer) {
}
return close;
}
-
+
+ /**
+ * Pauses all update requests to this core and waits (indefinitely) for all
in-flight
+ * update requests to finish
+ */
+ public void pauseUpdatesAndAwaitInflightRequests() {
+ if (pauseUpdateRequests.compareAndSet(false, true)) {
+ inflightUpdatesCounter.register();
+ inflightUpdatesCounter.arriveAndAwaitAdvance();
+ }
+ }
+
+ /**
+ * Unpauses update requests to this core
+ */
+ public void unpauseUpdates() {
+ this.pauseUpdateRequests.set(false);
+ }
+
+ /**
+ * Registers in-flight update requests to this core.
+ *
+ * @return true if request was registered, false if update requests are
paused
+ */
+ public boolean registerInFlightUpdate() {
+ if (pauseUpdateRequests.get()) {
+ return false;
+ }
+ inflightUpdatesCounter.register();
Review comment:
According to the javadocs, register() is a no-op if phaser has
terminated so we don't need to worry about it.
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