MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
        The table_fragments table provides
        information about the fragmentation, partitioning, distribution,
        and (internal) replication of NDB tables.
      
        The table_fragments table contains the
        following columns:
      
            node_id
          
            Node ID (DIH master)
          
            table_id
          
Table ID
            partition_id
          
Partition ID
            fragment_id
          
Fragment ID (same as partition ID unless table is fully replicated)
            partition_order
          
Order of fragment in partition
            log_part_id
          
Log part ID of fragment
            no_of_replicas
          
Number of fragment replicas
            current_primary
          
Current primary node ID
            preferred_primary
          
Preferred primary node ID
            current_first_backup
          
Current first backup node ID
            current_second_backup
          
Current second backup node ID
            current_third_backup
          
Current third backup node ID
            num_alive_replicas
          
Current number of live fragment replicas
            num_dead_replicas
          
Current number of dead fragment replicas
            num_lcp_replicas
          
Number of fragment replicas remaining to be checkpointed
        The table_fragments table was added in NDB
        7.5.4.