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Fix a slow memory leak in long-lived FutureIterator objects, as used by FuturePool

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Summary:
See T13572. FutureIterator does not release futures, so long-lived iterators (like the one that FuturePool may build) can end up leaking memory.

This affects the FuturePool used by the daemon overseer.

See T13572 for more discussion.

Test Plan:
  - Ran the simple FutureIterator script from T13572. Before: memory held during iteration, script grows without bound. After: memory released, script uses stable memory.
  - Ran the overseer with memory logging and an immediate wakeup from hibernation. Before: saw memory usage grow without bound at a rate of ~300MB/day. After: saw memory usage stable.

Differential Revision: https://secure.phabricator.com/D21466
This commit is contained in:
epriestley 2020-09-17 12:50:02 -07:00
parent de209ec064
commit 8e5e49984d
1 changed files with 8 additions and 1 deletions
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9
src/future/FutureIterator.php
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@ -194,7 +194,14 @@ final class FutureIterator
* @task iterator
*/
public function next() {
$this->key = null;
// See T13572. If we preivously resolved and returned a Future, release
// it now. This prevents us from holding Futures indefinitely when callers
// like FuturePool build long-lived iterators and keep adding new Futures
// to them.
if ($this->key !== null) {
unset($this->futures[$this->key]);
$this->key = null;
}
$this->updateWorkingSet();