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From "Semen Boikov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-627) Inconsistent value in near cache
Date Fri, 27 Mar 2015 10:39:52 GMT
Semen Boikov created IGNITE-627:
-----------------------------------

             Summary: Inconsistent value in near cache
                 Key: IGNITE-627
                 URL: https://issues.apache.org/jira/browse/IGNITE-627
             Project: Ignite
          Issue Type: Bug
          Components: cache
            Reporter: Semen Boikov
            Assignee: Semen Boikov
            Priority: Critical
             Fix For: sprint-3


This scenario is possible in atomic cache with near cache enabled:
- key is updated concurrently from near and primary node
- primary node first executes update request from near node, registers it as reader and sends
GridNearAtomicUpdateResponse to near node
- then primary node executes second update, sees that there is a reader and sends GridDhtAtomicUpdateRequest
to near node
- GridDhtAtomicUpdateRequest is handled first on near node (see GridNearAtomicCache.processDhtAtomicUpdateRequest),
it tries to peek entry, it is not created yet and it is considered as evicted, updated is
skipped and reader will be removed on primary node
- then near node handles GridNearAtomicUpdateResponse  and creates entry with incorrect value

Tests GridCacheValueConsistencyAtomicPrimaryWriteOrderNearEnabledSelfTest.testPutRemoveConsistencyMultithreaded
and testPutConsistencyMultithreaded fail from time to time because of this issue.

Most probably there is similar issue in transactional cache since 
GridCacheValueConsistencyTransactionalNearEnabledSelfTest also fails from time to time.



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