Hi Igniters,

Am trying to downgrade from Ignite 2.7 to 2.6 to due to some requirement and 
its failing with below exception. The reason for raising this as a concern is, 
when I tried to downgrade data store of 2.6 to 2.5 it worked. So is this an 
expected behavior or is there a bug ?



Stack Trace:

                
[2019-02-07T15:46:31,437][ERROR][exchange-worker-#42%EDIFCustomer%][GridCacheOffheapManager]
 Unhandled exception during page store initialization. All further operations 
will be failed and local node will be stopped.

java.lang.ArrayIndexOutOfBoundsException: 1

        at 
org.apache.ignite.internal.processors.cache.persistence.tree.io.IOVersions.forVersion(IOVersions.java:85)
 ~[ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.tree.io.PageIO.getPageIO(PageIO.java:466)
 ~[ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.tree.io.PageIO.getPageIO(PageIO.java:438)
 ~[ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager$GridCacheDataStore.getOrAllocatePartitionMetas(GridCacheOffheapManager.java:1337)
 ~[ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager$GridCacheDataStore.init0(GridCacheOffheapManager.java:1191)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager$GridCacheDataStore.updateCounter(GridCacheOffheapManager.java:1420)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtLocalPartition.updateCounter(GridDhtLocalPartition.java:942)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtLocalPartition.<init>(GridDhtLocalPartition.java:222)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtPartitionTopologyImpl.forceCreatePartition(GridDhtPartitionTopologyImpl.java:843)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.restorePartitionStates(GridCacheDatabaseSharedManager.java:2380)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.applyLastUpdates(GridCacheDatabaseSharedManager.java:2333)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.restoreState(GridCacheDatabaseSharedManager.java:1443)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.beforeExchange(GridCacheDatabaseSharedManager.java:1183)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.preloader.GridDhtPartitionsExchangeFuture.distributedExchange(GridDhtPartitionsExchangeFuture.java:1132)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.preloader.GridDhtPartitionsExchangeFuture.init(GridDhtPartitionsExchangeFuture.java:712)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager$ExchangeWorker.body0(GridCachePartitionExchangeManager.java:2419)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager$ExchangeWorker.body(GridCachePartitionExchangeManager.java:2299)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:110) 
[ignite-core-2.6.0.jar:2.6.0]

        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]

2019-02-07T15:46:31,437][ERROR][exchange-worker-#42%EDIFCustomer%][GridCacheOffheapManager]
 Unhandled exception during page store initialization. All further operations 
will be failed and local node will be stopped.

[2019-02-07T15:46:31,444][ERROR][exchange-worker-#42%EDIFCustomer%][] Critical 
system error detected. Will be handled accordingly to configured handler 
[hnd=class o.a.i.failure.StopNodeOrHaltFailureHandler, 
failureCtx=FailureContext [type=CRITICAL_ERROR, 
err=java.lang.ArrayIndexOutOfBoundsException: 1]]

java.lang.ArrayIndexOutOfBoundsException: 1

        at 
org.apache.ignite.internal.processors.cache.persistence.tree.io.IOVersions.forVersion(IOVersions.java:85)
 ~[ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.tree.io.PageIO.getPageIO(PageIO.java:466)
 ~[ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.tree.io.PageIO.getPageIO(PageIO.java:438)
 ~[ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager$GridCacheDataStore.getOrAllocatePartitionMetas(GridCacheOffheapManager.java:1337)
 ~[ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager$GridCacheDataStore.init0(GridCacheOffheapManager.java:1191)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager$GridCacheDataStore.updateCounter(GridCacheOffheapManager.java:1420)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtLocalPartition.updateCounter(GridDhtLocalPartition.java:942)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtLocalPartition.<init>(GridDhtLocalPartition.java:222)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtPartitionTopologyImpl.forceCreatePartition(GridDhtPartitionTopologyImpl.java:843)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.restorePartitionStates(GridCacheDatabaseSharedManager.java:2380)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.applyLastUpdates(GridCacheDatabaseSharedManager.java:2333)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.restoreState(GridCacheDatabaseSharedManager.java:1443)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.beforeExchange(GridCacheDatabaseSharedManager.java:1183)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.preloader.GridDhtPartitionsExchangeFuture.distributedExchange(GridDhtPartitionsExchangeFuture.java:1132)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.distributed.dht.preloader.GridDhtPartitionsExchangeFuture.init(GridDhtPartitionsExchangeFuture.java:712)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager$ExchangeWorker.body0(GridCachePartitionExchangeManager.java:2419)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager$ExchangeWorker.body(GridCachePartitionExchangeManager.java:2299)
 [ignite-core-2.6.0.jar:2.6.0]

        at 
org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:110) 
[ignite-core-2.6.0.jar:2.6.0]

        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]

2019-02-07T15:46:31,444][ERROR][exchange-worker-#42%EDIFCustomer%][] Critical 
system error detected. Will be handled accordingly to configured handler 
[hnd=class o.a.i.failure.StopNodeOrHaltFailureHandler, 
failureCtx=FailureContext [type=CRITICAL_ERROR, 
err=java.lang.ArrayIndexOutOfBoundsException: 1]]

[2019-02-07T15:46:31,445][ERROR][exchange-worker-#42%EDIFCustomer%][] JVM will 
be halted immediately due to the failure: [failureCtx=FailureContext 
[type=CRITICAL_ERROR, err=java.lang.ArrayIndexOutOfBoundsException: 1]]

2019-02-07T15:46:31,445][ERROR][exchange-worker-#42%EDIFCustomer%][] JVM will 
be halted immediately due to the failure: [failureCtx=FailureContext 
[type=CRITICAL_ERROR, err=java.lang.ArrayIndexOutOfBoundsException: 1]]

Thanks!
Kamlesh Joshi

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