thomasmueller commented on code in PR #538:
URL: https://github.com/apache/jackrabbit-oak/pull/538#discussion_r846241402
##########
oak-run-commons/src/main/java/org/apache/jackrabbit/oak/index/indexer/document/flatfile/MergeRunner.java:
##########
@@ -254,6 +274,14 @@ public void run() {
}
}
log.info("Waiting for batch sorting tasks completion");
+
+ // Parent thread signals to stop immediately
+ if (unmergedFiles.contains(MERGE_FORCE_STOP_POISON_PILL)) {
+ log.info("Merger receives force stop signal, shutting down all
merge tasks");
+ executorService.shutdownNow();
Review Comment:
This cancels tasks via Thread.interrupt(), which is very problematic: is
closes all open files and sockets, and this can cause issues. See also
https://stackoverflow.com/questions/2020992/is-thread-interrupt-evil#:~:text=The%20main%20problem%20with%20Thread,interrupt%20the%20thread%20right%20away.
- and we had issues in Oak and AEM as well.
In my view, we must not use shutdownNow here.
##########
oak-run-commons/src/test/java/org/apache/jackrabbit/oak/index/indexer/document/flatfile/FlatFileStoreTest.java:
##########
@@ -49,8 +49,8 @@
import static java.util.Arrays.asList;
import static java.util.Collections.singleton;
import static
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileNodeStoreBuilder.OAK_INDEXER_SORT_STRATEGY_TYPE;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
+import static
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileNodeStoreBuilder.PROP_MERGE_TASK_BATCH_SIZE;
+import static org.junit.Assert.*;
Review Comment:
Please don't use star imports.
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