Hello, I have a urgent issues on our production env for ignite issues.

I have deployed ignite cluster with standalone server for 7 server nodes,
each ignite node memory is 40G. totally is 270G.

[10:05:11] Topology snapshot [ver=2356, servers=7, clients=0, CPUs=1488,
heap=270GB]

....

we have set all the ignite connection is "client" mode, when we have 60
clients(each clients is 4GB), then ignite with the following information 

*[10:05:11] Topology snapshot [ver=2356, servers=7, clients=60, CPUs=1488,
heap=510GB]*

sometimes all the ignite shut down quickly  and error message is 
[13:08:12,549][SEVERE][exchange-worker-#136%null%][GridDhtPartitionsExchangeFuture]
Failed to reinitialize local partitions (preloading will be stopped):
GridDhtPartitionExchangeId [topVer=AffinityTopologyVersion [topVer=2582,
minorTopVer=0], nodeId=8837eae8, evt=NODE_FAILED]
java.lang.NullPointerException
        at
org.apache.ignite.internal.processors.cache.distributed.dht.preloader.GridDhtPartitionsExchangeFuture.distributedExchange(GridDhtPartitionsExchangeFuture.java:734)
        at
org.apache.ignite.internal.processors.cache.distributed.dht.preloader.GridDhtPartitionsExchangeFuture.init(GridDhtPartitionsExchangeFuture.java:473)
        at
org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager$ExchangeWorker.body(GridCachePartitionExchangeManager.java:1440)
        at
org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:110)
        at java.lang.Thread.run(Thread.java:745)
[13:08:12] Ignite node stopped OK [uptime=25:07:08:283]



I have 2 questions as below
1) Can you please tell me what's wrong with this error message?
2)
*[10:05:11] Topology snapshot [ver=2356, servers=7, clients=60, CPUs=1488,
heap=510GB]*
client total memory is 240GB(60 client nodes * 4GB), is this is root cause? 



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