Hi Team,

                We are trying to start another Ignite cluster by taking a copy 
of the running cluster's datastore (source cluster's datastore is getting 
modified in parallel). So, when we try to start the server node with copied 
datastore, it gives error as below. Also, giving cluster configuration for 
reference:

pageSize=#{4 * 1024}
walMode=LOG_ONLY
walFlushFrequency=60000
rebalanceThreadPoolSize=8
rebalanceThrottle=100
rebalanceBatchSize=#{32 * 1024 * 1024}
storagePath=/datastore/datastore
walPath=/datastore1/wal
walArchivePath=/datastore1/archive
metadataWorkDir=/datastore/metadataWorkDir


[2019-06-05T12:21:52,943][INFO ][main][GridCacheDatabaseSharedManager] Read 
checkpoint status [startMarker=null, endMarker=null]
[2019-06-05T12:21:52,967][INFO ][main][PageMemoryImpl] Started page memory 
[memoryAllocated=128.0 MiB, pages=31744, tableSize=2.5 MiB, 
checkpointBuffer=100.0 MiB]
[2019-06-05T12:21:52,968][INFO ][main][GridCacheDatabaseSharedManager] Checking 
memory state [lastValidPos=FileWALPointer [idx=0, fileOff=0, len=0], 
lastMarked=FileWALPointer [idx=0, fileOff=0, len=0], 
lastCheckpointId=00000000-0000-0000-0000-000000000000]
[2019-06-05T12:21:52,973][ERROR][main][IgniteKernal%EDIFCustomer_DR] Exception 
during start processors, node will be stopped and close connections
org.apache.ignite.IgniteCheckedException: Failed to start processor: 
GridProcessorAdapter []
        at 
org.apache.ignite.internal.IgniteKernal.startProcessor(IgniteKernal.java:1742) 
~[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgniteKernal.start(IgniteKernal.java:980) 
[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance.start0(IgnitionEx.java:2014)
 [ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance.start(IgnitionEx.java:1723)
 [ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start0(IgnitionEx.java:1151) 
[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.IgnitionEx.startConfigurations(IgnitionEx.java:1069) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:955) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:854) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:724) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:693) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.Ignition.start(Ignition.java:352) 
[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.startup.cmdline.CommandLineStartup.main(CommandLineStartup.java:301)
 [ignite-core-2.6.0.jar:2.6.0]
Caused by: org.apache.ignite.IgniteCheckedException: WAL history is too short 
[descs=[org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$FileDescriptor@4d6c2],
 start=FileWALPointer [idx=0, fileOff=0, len=0]]
        at 
org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$RecordsIterator.init(FileWriteAheadLogManager.java:3009)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$RecordsIterator.<init>(FileWriteAheadLogManager.java:2960)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$RecordsIterator.<init>(FileWriteAheadLogManager.java:2896)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager.replay(FileWriteAheadLogManager.java:799)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.restoreMemory(GridCacheDatabaseSharedManager.java:1968)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.readMetastore(GridCacheDatabaseSharedManager.java:574)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.start0(GridCacheDatabaseSharedManager.java:525)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.GridCacheSharedManagerAdapter.start(GridCacheSharedManagerAdapter.java:61)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.start(GridCacheProcessor.java:700)
 ~[ignite-core-2.6.0.jar:2.6.0]
       at 
org.apache.ignite.internal.IgniteKernal.startProcessor(IgniteKernal.java:1739) 
~[ignite-core-2.6.0.jar:2.6.0]
        ... 11 more
[2019-06-05T12:21:52,978][ERROR][main][IgniteKernal%EDIFCustomer_DR] Got 
exception while starting (will rollback startup routine).
org.apache.ignite.IgniteCheckedException: Failed to start processor: 
GridProcessorAdapter []
        at 
org.apache.ignite.internal.IgniteKernal.startProcessor(IgniteKernal.java:1742) 
~[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgniteKernal.start(IgniteKernal.java:980) 
[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance.start0(IgnitionEx.java:2014)
 [ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance.start(IgnitionEx.java:1723)
 [ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start0(IgnitionEx.java:1151) 
[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.IgnitionEx.startConfigurations(IgnitionEx.java:1069) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:955) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:854) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:724) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:693) 
[ignite-core-2.6.0.jar:2.6.0]
        at org.apache.ignite.Ignition.start(Ignition.java:352) 
[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.startup.cmdline.CommandLineStartup.main(CommandLineStartup.java:301)
 [ignite-core-2.6.0.jar:2.6.0]
Caused by: org.apache.ignite.IgniteCheckedException: WAL history is too short 
[descs=[org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$FileDescriptor@4d6c2],
 start=FileWALPointer [idx=0, fileOff=0, len=0]]
        at 
org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$RecordsIterator.init(FileWriteAheadLogManager.java:3009)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$RecordsIterator.<init>(FileWriteAheadLogManager.java:2960)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$RecordsIterator.<init>(FileWriteAheadLogManager.java:2896)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager.replay(FileWriteAheadLogManager.java:799)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.restoreMemory(GridCacheDatabaseSharedManager.java:1968)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.readMetastore(GridCacheDatabaseSharedManager.java:574)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager.start0(GridCacheDatabaseSharedManager.java:525)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.GridCacheSharedManagerAdapter.start(GridCacheSharedManagerAdapter.java:61)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.processors.cache.GridCacheProcessor.start(GridCacheProcessor.java:700)
 ~[ignite-core-2.6.0.jar:2.6.0]
        at 
org.apache.ignite.internal.IgniteKernal.startProcessor(IgniteKernal.java:1739) 
~[ignite-core-2.6.0.jar:2.6.0]


                So, is there any way to start this cluster with copied data 
store forcefully? This scenario may also arrive if WAL disk gets failed. How 
can we atleast start the cluster with minimum data loss ?
                Any help would be highly appreciated !

Thanks and Regards,
Kamlesh Joshi

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