Hi,
I have .Net Ignite client and server app Ignite v2.9.1. we have a 2 node
cluster,
recently we are upgraded ignite 2.7.6 to ignite 2.9.1 after using this
version we are facing issues frequently. 

[req=o.a.i.i.processors.platform.client.cache.ClientCacheGetRequest@bb5fb96]
javax.cache.CacheException: class
org.apache.ignite.internal.processors.cache.CacheInvalidStateException:
Failed to execute the cache operation (all partition owners have left the
grid, partition data has been lost) [cacheName=CREDENTIALS, partition=759,
key=UserKeyCacheObjectImpl [part=759,
val=SqlCredentialAdo-Althing-energyapp, hasValBytes=false]]
        at
org.apache.ignite.internal.processors.cache.GridCacheUtils.convertToCacheException(GridCacheUtils.java:1270)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.IgniteCacheProxyImpl.cacheException(IgniteCacheProxyImpl.java:2083)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.IgniteCacheProxyImpl.get(IgniteCacheProxyImpl.java:1110)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.GatewayProtectedCacheProxy.get(GatewayProtectedCacheProxy.java:676)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.platform.client.cache.ClientCacheGetRequest.process(ClientCacheGetRequest.java:41)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.platform.client.ClientRequestHandler.handle(ClientRequestHandler.java:99)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.odbc.ClientListenerNioListener.onMessage(ClientListenerNioListener.java:202)
[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.odbc.ClientListenerNioListener.onMessage(ClientListenerNioListener.java:56)
[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.util.nio.GridNioFilterChain$TailFilter.onMessageReceived(GridNioFilterChain.java:279)
[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.util.nio.GridNioFilterAdapter.proceedMessageReceived(GridNioFilterAdapter.java:109)
[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.util.nio.GridNioAsyncNotifyFilter$3.body(GridNioAsyncNotifyFilter.java:97)
[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:120)
[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.util.worker.GridWorkerPool$1.run(GridWorkerPool.java:70)
[ignite-core-2.9.1.jar:2.9.1]
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_181]
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_181]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]
Caused by:
org.apache.ignite.internal.processors.cache.CacheInvalidStateException:
Failed to execute the cache operation (all partition owners have left the
grid, partition data has been lost) [cacheName=CREDENTIALS, partition=759,
key=UserKeyCacheObjectImpl [part=759,
val=SqlCredentialAdo-Althing-energyapp, hasValBytes=false]]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtTopologyFutureAdapter.validateKey(GridDhtTopologyFutureAdapter.java:209)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtTopologyFutureAdapter.validateCache(GridDhtTopologyFutureAdapter.java:128)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.GridPartitionedSingleGetFuture.validate(GridPartitionedSingleGetFuture.java:859)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.GridPartitionedSingleGetFuture.map(GridPartitionedSingleGetFuture.java:277)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.GridPartitionedSingleGetFuture.init(GridPartitionedSingleGetFuture.java:244)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.getAsync0(GridDhtAtomicCache.java:1471)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.access$1600(GridDhtAtomicCache.java:141)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache$16.apply(GridDhtAtomicCache.java:477)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache$16.apply(GridDhtAtomicCache.java:475)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.asyncOp(GridDhtAtomicCache.java:779)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.getAsync(GridDhtAtomicCache.java:475)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.GridCacheAdapter.get(GridCacheAdapter.java:4844)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.GridCacheAdapter.repairableGet(GridCacheAdapter.java:4810)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.GridCacheAdapter.get(GridCacheAdapter.java:1469)
~[ignite-core-2.9.1.jar:2.9.1]
        at
org.apache.ignite.internal.processors.cache.IgniteCacheProxyImpl.get(IgniteCacheProxyImpl.java:1107)
~[ignite-core-2.9.1.jar:2.9.1]
        ... 13 more
Can you please assit me with the above issue thanks in advance.



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