gortiz commented on code in PR #12794:
URL: https://github.com/apache/pinot/pull/12794#discussion_r1555284969
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pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/memory/unsafe/DirectMemory.java:
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@@ -55,23 +54,18 @@ public void flush() {
}
@Override
- public void close()
- throws IOException {
+ public synchronized void close() {
if (!_closed) {
- synchronized (this) {
- if (!_closed) {
- Unsafer.UNSAFE.freeMemory(_address);
- _closed = true;
- }
- }
+ Unsafer.UNSAFE.freeMemory(_address);
Review Comment:
I think we have to recover the synchronization here. Otherwise a race
condition may try to free an address that was already cleaned. That could end
up producing a SIGSEV which would kill the server.
We can improve the code using double check
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