Hi,

Thank for the support so far. We have been using ignite from 4 years and we 
have no issues so far.
But now, We are facing critical issue in data loss while upgrading ignite from 
2.5.6 to 2.8.0.

We tried copying the work folder from 2.5.6 to 2.8.0 and start 2.8.0 ignite 
server.
But the server is going down with below error.
Please help us ASAP.

[05:15:22] Ignite node started OK (id=233c2412)
[05:15:22] Topology snapshot [ver=1, locNode=233c2412, servers=1, clients=0, 
state=INACTIVE, CPUs=8, offheap=22.0GB, heap=14.0GB]
[05:15:22]   ^-- Baseline [id=0, size=1, online=1, offline=0]
[05:15:22]   ^-- All baseline nodes are online, will start auto-activation
[05:15:23,679][SEVERE][exchange-worker-#46][GridDhtPartitionsExchangeFuture] 
Failed to activate node components 
[nodeId=233c2412-5483-41ad-b27f-61cbacd1610c, client=false, 
topVer=AffinityTopologyVersion [topVer=1, minorTopVer=1]]
java.lang.IllegalStateException: Duplicate key
        at 
org.apache.ignite.cache.QueryEntity.checkIndexes(QueryEntity.java:233)
        at org.apache.ignite.cache.QueryEntity.makePatch(QueryEntity.java:184)
        at 
org.apache.ignite.internal.processors.query.QuerySchema.makePatch(QuerySchema.java:114)
        at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.prepareCacheContext(GridCacheProcessor.java:1972)
        at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.lambda$null$6a5b31b9$1(GridCacheProcessor.java:1830)
        at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.lambda$prepareStartCachesIfPossible$9(GridCacheProcessor.java:1771)
        at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.lambda$prepareStartCaches$926b6886$1(GridCacheProcessor.java:1827)
        at 
org.apache.ignite.internal.util.IgniteUtils.lambda$null$1(IgniteUtils.java:11138)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
        Suppressed: java.lang.IllegalStateException: Duplicate key
                ... 12 more
        Suppressed: java.lang.IllegalStateException: Duplicate key
                ... 12 more
        Suppressed: java.lang.IllegalStateException: Duplicate key
                ... 12 more
        Suppressed: java.lang.IllegalStateException: Duplicate key
                ... 12 more
        Suppressed: java.lang.IllegalStateException: Duplicate key
                at 
org.apache.ignite.cache.QueryEntity.checkIndexes(QueryEntity.java:233)
                at 
org.apache.ignite.cache.QueryEntity.makePatch(QueryEntity.java:184)
                at 
org.apache.ignite.internal.processors.query.QuerySchema.makePatch(QuerySchema.java:114)
                at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.prepareCacheContext(GridCacheProcessor.java:1972)
                at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.lambda$null$6a5b31b9$1(GridCacheProcessor.java:1830)
                at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.lambda$prepareStartCachesIfPossible$9(GridCacheProcessor.java:1771)


Thanks,
Sriveena
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