Barry Oglesby created GEODE-4957:
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Summary: The key used in a putIfAbsent call that returns null may
not be the one in the RegionEntry
Key: GEODE-4957
URL: https://issues.apache.org/jira/browse/GEODE-4957
Project: Geode
Issue Type: Bug
Components: regions
Reporter: Barry Oglesby
With simultaneous putIfAbsent calls, sometimes the thread that returns null is
not the thread that actually creates the RegionEntry.
Below is some logging that shows this behavior.
Thread-77 returns null from the putIfAbsent call (which means there was no
previous value). 1 ms before Thread-77's putEntryIfAbsent call, Thread-9
creates the RegionEntry. You can see that because not only is oldRe=null for
Thread-9, but also the event's key (eventKey) and entry's key (reKey) are
identical. But Thread-9 returns a non-null old value.
{noformat}
Thread-77 at 1522187267493: AbstractRegionMap.putEntryIfAbsent
regionEntry=VersionedStatsDiskLRURegionEntryHeapObjectKey@6a8119a0
(key=ComplexKey[identity=1682369152; key=key]; rawValue=REMOVED_PHASE1;
version=\{v0; rv0; ds=0; time=0};member=null);
oldRe=VersionedStatsDiskLRURegionEntryHeapObjectKey@1aac7604
(key=ComplexKey[identity=342592289; key=key]; rawValue=REMOVED_PHASE1;
version=\{v0; rv0; ds=0; time=0};member=null)
Thread-77 at 1522187267493: AbstractRegionMap.basicPut
eventKey=ComplexKey[identity=1682369152; key=key];
reKey=ComplexKey[identity=342592289; key=key]
Thread-77 at 1522187267500: LocalRegion.putIfAbsent returning null
{noformat}
{noformat}
Thread-9 at 1522187267492: AbstractRegionMap.putEntryIfAbsent
regionEntry=VersionedStatsDiskLRURegionEntryHeapObjectKey@1aac7604
(key=ComplexKey[identity=342592289; key=key]; rawValue=REMOVED_PHASE1;
version=\{v0; rv0; ds=0; time=0};member=null); oldRe=null
Thread-9 at 1522187267495: AbstractRegionMap.basicPut
eventKey=ComplexKey[identity=342592289; key=key];
reKey=ComplexKey[identity=342592289; key=key]
Thread-9 at 1522187267504: LocalRegion.putIfAbsent returning v1
{noformat}
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