Rebalance exited with reason pre_rebalance_janitor_run_failed

3 nodes rebalancing out 2 nodes, 1M items and goes loading, 11 ddocs indexing, queries running, 4 core cpu,

[ns_server:error,2012-08-17T13:45:50.690,ns_1@10.3.121.17:<0.4157.1>:ns_memcached:verify_report_long_call:274]call topkeys took too long: 1519642 us
[ns_server:error,2012-08-17T13:45:50.812,ns_1@10.3.121.17:<0.23600.6>:ns_janitor:cleanup_with_states:84]Bucket "bucket-0" not yet ready on ['ns_1@10.3.121.17']
[user:info,2012-08-17T13:45:50.824,ns_1@10.3.121.17:<0.6321.4>:ns_orchestrator:handle_info:294]Rebalance exited with reason

{pre_rebalance_janitor_run_failed, ['ns_1@10.3.121.17']}