Ignite has been deployed on the kubernets , there are 3 replicas of server pod. The pods were up and running fine for 9 days.  We have created 180 inventory tables and 204 transactional tables. The data has been inserted using the PyIgnite client using the cache.put() method.  This is a very slow operation because PyIgnite is very slow.  Each insert is committed one at a time, so it is not able to do bulk-style inserts. The PyIgnite was inserting about 20 of the inventory tables simultaneously (20 different threads/processes).

The cluster was nowhere stable after 9days, one of the pod crashed and failed to recover. Below is the error log:

{"type":"log","host":"ignite-cluster-ignite-esoc-2","level":"ERROR","system":"ignite-service","time":"2019-08-16T17:13:34,769Z","logger":"GridCachePartitionExchangeManager","timezone":"UTC","log":"Failed to process custom exchange task: ClientCacheChangeDummyDiscoveryMessage [reqId=6b5f6c50-a8c9-4b04-a461-49bfd0112eb0, cachesToClose=null, startCaches=[BgwService]] java.lang.NullPointerException| at org.apache.ignite.internal.processors.cache.CacheAffinitySharedManager.processClientCachesChanges(CacheAffinitySharedManager.java:635)| at org.apache.ignite.internal.processors.cache.GridCacheProcessor.processCustomExchangeTask(GridCacheProcessor.java:391)| at org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager$ExchangeWorker.processCustomTask(GridCachePartitionExchangeManager.java:2475)| at org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager$ExchangeWorker.body0(GridCachePartitionExchangeManager.java:2620)| at org.apache.ignite.internal.processors.cache.GridCachePartitionExchangeManager$ExchangeWorker.body(GridCachePartitionExchangeManager.java:2539)| at org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:120)| at java.lang.Thread.run(Thread.java:748)"} {"type":"log","host":"ignite-cluster-ignite-esoc-2","level":"WARN","system":"ignite-service","time":"2019-08-16T17:13:36,724Z","logger":"GridCacheDatabaseSharedManager","timezone":"UTC","log":"Ignite node stopped in the middle of checkpoint. Will restore memory state and finish checkpoint on node start."}

The error report file and ignite-config.xml has been attached for your info.

Heap Memory and RAM Configurations are as below on each of the ignite server container:

Heap Memory: 32gb

RAM: 64GB

Default memory region: 

cpu: 4

Persistence volume

wal_storage_size: 10GB

persistence_storage_size: 10GB


Thanks

With Regards

Radha