jpountz commented on code in PR #12199:
URL: https://github.com/apache/lucene/pull/12199#discussion_r1132647604
##########
lucene/core/src/java/org/apache/lucene/index/DocumentsWriterPerThreadPool.java:
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@@ -113,15 +113,19 @@ private synchronized DocumentsWriterPerThread newWriter()
{
* operation (add/updateDocument).
*/
DocumentsWriterPerThread getAndLock() {
- synchronized (this) {
- ensureOpen();
- DocumentsWriterPerThread dwpt =
freeList.poll(DocumentsWriterPerThread::tryLock);
- if (dwpt == null) {
- dwpt = newWriter();
+ ensureOpen();
+ DocumentsWriterPerThread dwpt =
freeList.poll(DocumentsWriterPerThread::tryLock);
+ if (dwpt == null) {
Review Comment:
I don't think that this is a case of double-checked locking. In general
double-checked locking tries to reduce the overhead of acquiring a lock by
adding a quick check before the lock. Here the logic is different, it would be
legal to remove the call to `poll` under lock, I only added it because there is
a chance that a thread had to wait on the lock, so we could check if another
DWPT was added to the queue in the meantime in order to save creating a new
DWPT. I don't think it's actually important, I could remove the second call to
`poll` to make it look less like double-checked locking.
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