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https://issues.apache.org/jira/browse/GEODE-8671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17293870#comment-17293870
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ASF GitHub Bot commented on GEODE-8671:
---------------------------------------
kirklund commented on a change in pull request #5925:
URL: https://github.com/apache/geode/pull/5925#discussion_r585774024
##########
File path:
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/RegionConcurrentOperationDUnitTest.java
##########
@@ -131,6 +140,49 @@ public void
getOnPreLoadedRegionFromMultipleThreadsReturnSameObject() throws Exc
assertThat(cacheRule.getCache().getRegion(regionName).size()).isEqualTo(1);
}
+ @Test
+ public void
getOnPartitionedRegionFromMultipleThreadsReturnsDifferentPdxInstances()
+ throws Exception {
+ String regionName = getClass().getSimpleName();
+ CacheFactory cacheFactory = new CacheFactory();
+ cacheFactory.setPdxReadSerialized(true);
+ cacheRule.createCache(cacheFactory);
+ InternalCache cache = cacheRule.getCache();
+ cache.setCopyOnRead(true);
+ Region region = cache.createRegionFactory(PARTITION)
+ .create(regionName);
+
+ // Keep doing this concurrency test for 30 seconds.
+ long endTime = Duration.ofSeconds(30).toMillis() +
System.currentTimeMillis();
+
+ while (System.currentTimeMillis() < endTime) {
+ Callable<Object> getValue = () -> {
+ while (true) {
+ Object value = region.get(key);
+ if (value != null) {
+ return value;
+ }
+ }
+ };
+
+ // In this test, two threads are doing gets. One thread puts the value
+ // We expect that the threads will *always* get different PdxInstance
values
+ Future get1 = executorServiceRule.submit(getValue);
+ Future get2 = executorServiceRule.submit(getValue);
+ Future put = executorServiceRule.submit(() -> region.put(key, new
TestValue()));
Review comment:
If the Future is not going to have a result then go with `Future<Void>`.
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> Two threads calling get and retrieve the same PdxInstance, resulting in
> corruption
> ----------------------------------------------------------------------------------
>
> Key: GEODE-8671
> URL: https://issues.apache.org/jira/browse/GEODE-8671
> Project: Geode
> Issue Type: Improvement
> Components: regions
> Reporter: Dan Smith
> Assignee: Jianxia Chen
> Priority: Major
> Labels: blocks-1.14.0, pull-request-available
>
> Even if copy-on-read is set to true, two threads calling get on a partitioned
> region can end up with the same PdxInstance object.
> This is problematic because some PdxInstances methods are not thread safe.
> Although the underlying bytes are immutatable, the PDXInstance has a
> ByteSource with a position field that changes. That means two threads doing
> serialization or calling toString on the PdxInstance could result in one or
> more threads getting a corrupt read.
> It looks like they are ending up with the same instance because of the
> behavior in LocalRegion.optimizedGetObject. We use futures to make sure there
> is only 1 get that goes through, and both threads receive the same value.
>
> Ending up in optimizedGetObject requires a race with the put, because if the
> value was in the cache at the beginning of the get it would be returned
> earlier in the get process.
> I put a test that reproduces this issue here -
> https://github.com/upthewaterspout/geode/pull/new/feature/pdx-instances-shared
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