Performance and scalability limitations
HDFS replication has some limitations.
- The maximum number of files for a single replication job is 100 million.
- The maximum number of files for a replication policy that runs more frequently than once in 8 hours is 10 million.
- The throughput of the replication job depends on the absolute read and write throughput of the source and destination clusters.
- Regular rebalancing of your HDFS clusters is required for efficient operation of replications.