zacharymorn commented on a change in pull request #128:
URL: https://github.com/apache/lucene/pull/128#discussion_r697141222
##########
File path:
lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java
##########
@@ -895,7 +895,11 @@ public synchronized void close() throws IOException {
System.out.println("\nNOTE: MockDirectoryWrapper: now run
CheckIndex");
}
- TestUtil.checkIndex(this, getCrossCheckTermVectorsOnClose(), true,
null);
+ // Methods in MockDirectoryWrapper hold locks on this, which will
cause deadlock when
+ // TestUtil#checkIndex checks segment concurrently using another
thread, but making
+ // call back to synchronized methods such as
MockDirectoryWrapper#fileLength.
+ // Hence passing concurrent = false to this method to turn off
concurrent checks.
+ TestUtil.checkIndex(this, getCrossCheckTermVectorsOnClose(), true,
false, null);
Review comment:
> Maybe open a follow-on issue to fix this sync situation so that we
could, randomly, sometimes use concurrency in CheckIndex from tests?
Sounds good. I've created this issue
https://issues.apache.org/jira/browse/LUCENE-10071 for following up on this.
> Maybe we could start by making some of the TestUtil.checkIndex use
concurrency, just not the one that MDW invokes?
Yes this is already done in
https://github.com/apache/lucene/pull/128/commits/138b72e9f2512df257c9acf01516bd071c9fb1d4,
where `CheckIndex#checkIndex` got a new parameter `concurrent`, and most of
the invocations except the one in MDW would pass in `true` to enable
concurrency.
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