[infinispan-issues] [JBoss JIRA] (ISPN-3163) Replacing entry via HotRod which was initially stored via Memcached does not change CAS

[Martin Gencur (JIRA)]

Martin Gencur created ISPN-3163:
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             Summary: Replacing entry via HotRod which was initially stored via Memcached does not change CAS
                 Key: ISPN-3163
                 URL: https://issues.jboss.org/browse/ISPN-3163
             Project: Infinispan
          Issue Type: Bug
    Affects Versions: 5.3.0.CR1
            Reporter: Martin Gencur
            Assignee: Galder Zamarreño
             Fix For: 5.3.0.Final


Users might expect that CAS (check-and-set) operation will work even in compatibility mode which is currently not true in the following scenario:
1) store a key/value via Memcached
2) change the value via HotRod or Embedded 
3) use Memcached's CAS operation

In step #3 the memcached client will update the value even though the value was changed by another client in the meantime. The memcached client was supposed to change it only if it had not been changed in the meantime.

The following test snippet shows the problem:
{code:java}
public void testMemcachedPutHotRodEmbbeddedReplaceMemcachedCASTest() throws Exception {
      final String key1 = "5";

      // 1. Put with Memcached
      Future<Boolean> f = cacheFactory.getMemcachedClient().set(key1, 0, "v1");
      assertTrue(f.get(60, TimeUnit.SECONDS));
      CASValue oldValue = cacheFactory.getMemcachedClient().gets(key1);

      // 2. Replace with Hot Rod
      VersionedValue versioned = cacheFactory.getHotRodCache().getVersioned(key1);
      assertTrue(cacheFactory.getHotRodCache().replaceWithVersion(key1, "v2", versioned.getVersion()));

      // 3. Replace with Embedded
      assertTrue(cacheFactory.getEmbeddedCache().replace(key1, "v2", "v3"));

      // 4. Get with Memcached and verify value/CAS
      CASValue newValue = cacheFactory.getMemcachedClient().gets(key1);
      assertEquals("v3", newValue.getValue());
      assertTrue("The version (CAS) should have changed", oldValue.getCas() != newValue.getCas()); //<---- fails here
   }
{code}

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