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hadoop + namenode warning about Failed to place enough replicas

hadoop + namenode warning about Failed to place enough replicas

we have `hadoop` cluster with 3 data-nodes machines

 

we see the following warning from the first `namenode`

 

we configured the replica to 3 in `HDFS` configuration


but not see the right solution about - `Failed to place enough replicas: expected size is 1 but only 0` after searching a while from network


2020-05-11 19:22:46,578 WARN protocol.BlockStoragePolicy (BlockStoragePolicy.java:chooseStorageTypes(162)) - Failed to place enough replicas: expected size is 1 but only 0 storage types can be selected (replication=3, selected=[], unavailable=[DISK], removed=[DISK], policy=BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]})
2020-05-11 19:22:46,578 WARN protocol.BlockStoragePolicy (BlockStoragePolicy.java:chooseStorageTypes(162)) - Failed to place enough replicas: expected size is 1 but only 0 storage types can be selected (replication=3, selected=[], unavailable=[DISK], removed=[DISK], policy=BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]})
2020-05-11 19:22:46,580 WARN protocol.BlockStoragePolicy (BlockStoragePolicy.java:chooseStorageTypes(162)) - Failed to place enough replicas: expected size is 1 but only 0 storage types can be selected (replication=3, selected=[], unavailable=[DISK], removed=[DISK], policy=BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]})
2020-05-11 19:22:46,581 WARN protocol.BlockStoragePolicy (BlockStoragePolicy.java:chooseStorageTypes(162)) - Failed to place enough replicas: expected size is 1 but only 0 storage types can be selected (replication=3, selected=[], unavailable=[DISK], removed=[DISK], policy=BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]})

Michael-Bronson