Enable the four-letter words.
Keep in mind that this functionality will be deprecated, please use AdminServer instead.
Enable the four letter words inside zoo.cfg configuration file.
$ sudo -u zookeeper cat /opt/zookeeper/zookeeper/conf/zoo.cfg
tickTime=2000 initLimit=10 syncLimit=5 dataDir=/opt/zookeeper/zookeeper/data clientPort=2181 server.1=zookeeper1.example.org:2888:3888 server.2=zookeeper2.example.org:2888:3888 server.3=zookeeper3.example.org:2888:3888 4lw.commands.whitelist=*
You don’t need to enable every available command, use comma to list only needed ones.
Alternatively use JVMFLAGS.
$ sudo -u zookeeper cat /opt/zookeeper/zookeeper/conf/zookeeper-env.sh
JVMFLAGS="-Dzookeeper.4lw.commands.whitelist=*"
Restart ZooKeeper service.
$ systemctl restart zookeeper.service
Display configuration.
$ echo conf | nc zookeeper3.example.org 2181
clientPort=2181 secureClientPort=-1 dataDir=/opt/zookeeper/zookeeper/data/version-2 dataDirSize=67110138 dataLogDir=/opt/zookeeper/zookeeper/data/version-2 dataLogSize=67110138 tickTime=2000 maxClientCnxns=60 minSessionTimeout=4000 maxSessionTimeout=40000 clientPortListenBacklog=-1 serverId=3 initLimit=10 syncLimit=5 electionAlg=3 electionPort=3888 quorumPort=2888 peerType=0 membership: server.1=zookeeper1.example.org:2888:3888:participant server.2=zookeeper2.example.org:2888:3888:participant server.3=zookeeper3.example.org:2888:3888:participant
List connection details to this server.
$ echo cons | nc zookeeper3.example.org 2181
/172.16.0.113:53288[0](queued=0,recved=1,sent=0) /172.16.0.111:33890[1](queued=0,recved=2,sent=2,sid=0x30000b41d990000,lop=EXIS,est=1623450894071,to=30000,lcxid=0x1,lzxid=0x10000007c,lresp=11994794,llat=2,minlat=0,avglat=6,maxlat=11)
Reset connection statistics.
$ echo crst | nc zookeeper3.example.org 2181
Connection stats reset.
Display outstanding sessions and ephemeral nodes.
$ echo dump | nc zookeeper3.example.org 2181
SessionTracker dump:
Global Sessions(1):
0x30000b41d990000 30000ms
ephemeral nodes dump:
Sessions with Ephemerals (0):
Connections dump:
Connections Sets (4)/(2):
0 expire at Fri Jun 11 22:35:26 UTC 2021:
1 expire at Fri Jun 11 22:35:36 UTC 2021:
ip: /172.16.0.113:53290 sessionId: 0x0
0 expire at Fri Jun 11 22:35:46 UTC 2021:
1 expire at Fri Jun 11 22:35:56 UTC 2021:
ip: /172.16.0.111:33890 sessionId: 0x30000b41d990000
Display environment settings.
$ echo envi | nc zookeeper3.example.org 2181
Environment: zookeeper.version=3.7.0-e3704b390a6697bfdf4b0bef79e3da7a4f6bac4b, built on 2021-03-17 09:46 UTC host.name=zookeeper3 java.version=11.0.11 java.vendor=Debian java.home=/usr/lib/jvm/java-11-openjdk-amd64 java.class.path=/opt/zookeeper/zookeeper/bin/../zookeeper-server/target/classes:/opt/zookeeper/zookeeper/bin/../build/classes:/opt/zookeeper/zookeeper/bin/../zookeeper-server/target/lib/*.jar:/opt/zookeeper/zookeeper/bin/../build/lib/*.jar:/opt/zookeeper/zookeeper/bin/../lib/zookeeper-prometheus-metrics-3.7.0.jar:/opt/zookeeper/zookeeper/bin/../lib/zookeeper-jute-3.7.0.jar:/opt/zookeeper/zookeeper/bin/../lib/zookeeper-3.7.0.jar:/opt/zookeeper/zookeeper/bin/../lib/snappy-java-1.1.7.7.jar:/opt/zookeeper/zookeeper/bin/../lib/slf4j-log4j12-1.7.30.jar:/opt/zookeeper/zookeeper/bin/../lib/slf4j-api-1.7.30.jar:/opt/zookeeper/zookeeper/bin/../lib/simpleclient_servlet-0.9.0.jar:/opt/zookeeper/zookeeper/bin/../lib/simpleclient_hotspot-0.9.0.jar:/opt/zookeeper/zookeeper/bin/../lib/simpleclient_common-0.9.0.jar:/opt/zookeeper/zookeeper/bin/../lib/simpleclient-0.9.0.jar:/opt/zookeeper/zookeeper/bin/../lib/netty-transport-native-unix-common-4.1.59.Final.jar:/opt/zookeeper/zookeeper/bin/../lib/netty-transport-native-epoll-4.1.59.Final.jar:/opt/zookeeper/zookeeper/bin/../lib/netty-transport-4.1.59.Final.jar:/opt/zookeeper/zookeeper/bin/../lib/netty-resolver-4.1.59.Final.jar:/opt/zookeeper/zookeeper/bin/../lib/netty-handler-4.1.59.Final.jar:/opt/zookeeper/zookeeper/bin/../lib/netty-common-4.1.59.Final.jar:/opt/zookeeper/zookeeper/bin/../lib/netty-codec-4.1.59.Final.jar:/opt/zookeeper/zookeeper/bin/../lib/netty-buffer-4.1.59.Final.jar:/opt/zookeeper/zookeeper/bin/../lib/metrics-core-4.1.12.1.jar:/opt/zookeeper/zookeeper/bin/../lib/log4j-1.2.17.jar:/opt/zookeeper/zookeeper/bin/../lib/jline-2.14.6.jar:/opt/zookeeper/zookeeper/bin/../lib/jetty-util-ajax-9.4.38.v20210224.jar:/opt/zookeeper/zookeeper/bin/../lib/jetty-util-9.4.38.v20210224.jar:/opt/zookeeper/zookeeper/bin/../lib/jetty-servlet-9.4.38.v20210224.jar:/opt/zookeeper/zookeeper/bin/../lib/jetty-server-9.4.38.v20210224.jar:/opt/zookeeper/zookeeper/bin/../lib/jetty-security-9.4.38.v20210224.jar:/opt/zookeeper/zookeeper/bin/../lib/jetty-io-9.4.38.v20210224.jar:/opt/zookeeper/zookeeper/bin/../lib/jetty-http-9.4.38.v20210224.jar:/opt/zookeeper/zookeeper/bin/../lib/javax.servlet-api-3.1.0.jar:/opt/zookeeper/zookeeper/bin/../lib/jackson-databind-2.10.5.1.jar:/opt/zookeeper/zookeeper/bin/../lib/jackson-core-2.10.5.jar:/opt/zookeeper/zookeeper/bin/../lib/jackson-annotations-2.10.5.jar:/opt/zookeeper/zookeeper/bin/../lib/commons-cli-1.4.jar:/opt/zookeeper/zookeeper/bin/../lib/audience-annotations-0.12.0.jar:/opt/zookeeper/zookeeper/bin/../zookeeper-*.jar:/opt/zookeeper/zookeeper/bin/../zookeeper-server/src/main/resources/lib/*.jar:/opt/zookeeper/zookeeper/conf: java.library.path=/usr/java/packages/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib java.io.tmpdir=/tmp java.compiler=<NA> os.name=Linux os.arch=amd64 os.version=5.10.0-3-amd64 user.name=zookeeper user.home=/opt/zookeeper user.dir=/opt/zookeeper os.memory.free=6MB os.memory.max=966MB os.memory.total=14MB
My favorite four-letter word to test the server state.
$ echo ruok | nc zookeeper3.example.org 2181;echo
imok
Reset server statistics.
$ echo srst | nc zookeeper3.example.org 2181
Server stats reset.
Lists server statistics.
$ echo srvr | nc zookeeper3.example.org 2181
Zookeeper version: 3.7.0-e3704b390a6697bfdf4b0bef79e3da7a4f6bac4b, built on 2021-03-17 09:46 UTC Latency min/avg/max: 0/1.5/11 Received: 21 Sent: 20 Connections: 2 Outstanding: 0 Zxid: 0x10000007d Mode: follower Node count: 6
Display server details and connected clients.
$ echo stat | nc zookeeper3.example.org 2181
Zookeeper version: 3.7.0-e3704b390a6697bfdf4b0bef79e3da7a4f6bac4b, built on 2021-03-17 09:46 UTC Clients: /172.16.0.113:53300[0](queued=0,recved=1,sent=0) /172.16.0.111:33890[1](queued=0,recved=14,sent=14) Latency min/avg/max: 0/1.5/11 Received: 24 Sent: 23 Connections: 2 Outstanding: 0 Zxid: 0x10000007d Mode: follower Node count: 6
Lists watches on the server.
$ echo wchs | nc zookeeper3.example.org 2181
1 connections watching 1 paths Total watches:1
List detailed information on watches for the server, by session.
$ echo wchc | nc zookeeper3.example.org 2181
0x30000b41d990000
/app
Display the total size of snapshot and log files in bytes.
$ echo dirs | nc zookeeper3.example.org 2181
datadir_size: 134219018 logdir_size: 134219018
List detailed information on watches for the server, by path.
$ echo wchp | nc zookeeper3.example.org 2181
/app
0x30000b41d990000
Outputs a list of variables that could be used for monitoring the health of the cluster.
$ echo mntr | nc zookeeper3.example.org 2181
zk_version 3.7.0-e3704b390a6697bfdf4b0bef79e3da7a4f6bac4b, built on 2021-03-17 09:46 UTC zk_server_state follower zk_peer_state following - broadcast zk_ephemerals_count 0 zk_num_alive_connections 2 zk_avg_latency 1.1364 zk_outstanding_requests 0 zk_znode_count 6 zk_global_sessions 1 zk_non_mtls_remote_conn_count 0 zk_last_client_response_size 16 zk_packets_sent 36 zk_packets_received 37 zk_max_client_response_size 84 zk_connection_drop_probability 0.0 zk_watch_count 1 zk_auth_failed_count 0 zk_min_latency 0 zk_max_file_descriptor_count 524288 zk_approximate_data_size 219 zk_open_file_descriptor_count 62 zk_local_sessions 0 zk_uptime 394126 zk_max_latency 11 zk_outstanding_tls_handshake 0 zk_min_client_response_size 16 zk_non_mtls_local_conn_count 0 zk_non_mtls_local_conn_count 0 zk_quorum_size 3 zk_proposal_count 0 zk_watch_bytes 0 zk_outstanding_changes_removed 0 zk_throttled_ops 0 zk_stale_requests_dropped 0 zk_large_requests_rejected 0 zk_insecure_admin_count 0 zk_connection_rejected 0 zk_cnxn_closed_without_zk_server_running 0 zk_sessionless_connections_expired 0 zk_looking_count 1 zk_dead_watchers_queued 0 zk_stale_requests 0 zk_connection_drop_count 0 zk_learner_proposal_received_count 5 zk_digest_mismatches_count 0 zk_dead_watchers_cleared 0 zk_response_packet_cache_hits 0 zk_bytes_received_count 370 zk_add_dead_watcher_stall_time 0 zk_request_throttle_wait_count 0 zk_requests_not_forwarded_to_commit_processor 0 zk_response_packet_cache_misses 0 zk_ensemble_auth_success 0 zk_prep_processor_request_queued 0 zk_learner_commit_received_count 5 zk_stale_replies 0 zk_connection_request_count 1 zk_response_bytes 84 zk_ensemble_auth_fail 0 zk_diff_count 0 zk_response_packet_get_children_cache_misses 0 zk_connection_revalidate_count 0 zk_quit_leading_due_to_disloyal_voter 0 zk_snap_count 0 zk_unrecoverable_error_count 0 zk_unsuccessful_handshake 0 zk_commit_count 0 zk_stale_sessions_expired 0 zk_response_packet_get_children_cache_hits 0 zk_sync_processor_request_queued 5 zk_outstanding_changes_queued 0 zk_request_commit_queued 5 zk_ensemble_auth_skip 0 zk_skip_learner_request_to_next_processor_count 0 zk_tls_handshake_exceeded 0 zk_revalidate_count 0 zk_avg_socket_closing_time 0.0 zk_min_socket_closing_time 0 zk_max_socket_closing_time 0 zk_cnt_socket_closing_time 0 zk_sum_socket_closing_time 0 zk_avg_proposal_process_time 0.0 zk_min_proposal_process_time 0 zk_max_proposal_process_time 0 zk_cnt_proposal_process_time 0 zk_sum_proposal_process_time 0 zk_avg_leader_unavailable_time 0.0 zk_min_leader_unavailable_time 0 zk_max_leader_unavailable_time 0 zk_cnt_leader_unavailable_time 0 zk_sum_leader_unavailable_time 0 zk_avg_node_created_watch_count 0.0 zk_min_node_created_watch_count 0 zk_max_node_created_watch_count 0 zk_cnt_node_created_watch_count 0 zk_sum_node_created_watch_count 0 zk_avg_session_queues_drained 0.2 zk_min_session_queues_drained 0 zk_max_session_queues_drained 1 zk_cnt_session_queues_drained 5 zk_sum_session_queues_drained 1 zk_avg_write_commit_proc_req_queued 0.0741 zk_min_write_commit_proc_req_queued 0 zk_max_write_commit_proc_req_queued 1 zk_cnt_write_commit_proc_req_queued 27 zk_sum_write_commit_proc_req_queued 2 zk_avg_connection_token_deficit 0.0 zk_min_connection_token_deficit 0 zk_max_connection_token_deficit 0 zk_cnt_connection_token_deficit 1 zk_sum_connection_token_deficit 0 zk_avg_read_commit_proc_req_queued 0.7778 zk_min_read_commit_proc_req_queued 0 zk_max_read_commit_proc_req_queued 1 zk_cnt_read_commit_proc_req_queued 27 zk_sum_read_commit_proc_req_queued 21 zk_avg_node_deleted_watch_count 0.0 zk_min_node_deleted_watch_count 0 zk_max_node_deleted_watch_count 0 zk_cnt_node_deleted_watch_count 0 zk_sum_node_deleted_watch_count 0 zk_avg_startup_txns_load_time 10.0 zk_min_startup_txns_load_time 10 zk_max_startup_txns_load_time 10 zk_cnt_startup_txns_load_time 1 zk_sum_startup_txns_load_time 10 zk_avg_sync_processor_queue_size 0.0 zk_min_sync_processor_queue_size 0 zk_max_sync_processor_queue_size 0 zk_cnt_sync_processor_queue_size 6 zk_sum_sync_processor_queue_size 0 zk_avg_follower_sync_time 36.0 zk_min_follower_sync_time 36 zk_max_follower_sync_time 36 zk_cnt_follower_sync_time 1 zk_sum_follower_sync_time 36 zk_avg_prep_processor_queue_size 0.0 zk_min_prep_processor_queue_size 0 zk_max_prep_processor_queue_size 0 zk_cnt_prep_processor_queue_size 0 zk_sum_prep_processor_queue_size 0 zk_avg_fsynctime 2.0 zk_min_fsynctime 0 zk_max_fsynctime 10 zk_cnt_fsynctime 5 zk_sum_fsynctime 10 zk_avg_inflight_snap_count 0.0 zk_min_inflight_snap_count 0 zk_max_inflight_snap_count 0 zk_cnt_inflight_snap_count 0 zk_sum_inflight_snap_count 0 zk_avg_reads_issued_from_session_queue 0.0 zk_min_reads_issued_from_session_queue 0 zk_max_reads_issued_from_session_queue 0 zk_cnt_reads_issued_from_session_queue 5 zk_sum_reads_issued_from_session_queue 0 zk_avg_learner_request_processor_queue_size 0.0 zk_min_learner_request_processor_queue_size 0 zk_max_learner_request_processor_queue_size 0 zk_cnt_learner_request_processor_queue_size 23 zk_sum_learner_request_processor_queue_size 0 zk_avg_snapshottime 0.0 zk_min_snapshottime 0 zk_max_snapshottime 0 zk_cnt_snapshottime 0 zk_sum_snapshottime 0 zk_avg_unavailable_time 95.0 zk_min_unavailable_time 95 zk_max_unavailable_time 95 zk_cnt_unavailable_time 1 zk_sum_unavailable_time 95 zk_avg_startup_txns_loaded 120.0 zk_min_startup_txns_loaded 120 zk_max_startup_txns_loaded 120 zk_cnt_startup_txns_loaded 1 zk_sum_startup_txns_loaded 120 zk_avg_reads_after_write_in_session_queue 0.0 zk_min_reads_after_write_in_session_queue 0 zk_max_reads_after_write_in_session_queue 0 zk_cnt_reads_after_write_in_session_queue 1 zk_sum_reads_after_write_in_session_queue 0 zk_avg_requests_in_session_queue 1.0 zk_min_requests_in_session_queue 1 zk_max_requests_in_session_queue 1 zk_cnt_requests_in_session_queue 2 zk_sum_requests_in_session_queue 2 zk_avg_write_commit_proc_issued 1.0 zk_min_write_commit_proc_issued 1 zk_max_write_commit_proc_issued 1 zk_cnt_write_commit_proc_issued 5 zk_sum_write_commit_proc_issued 5 zk_avg_prep_process_time 0.0 zk_min_prep_process_time 0 zk_max_prep_process_time 0 zk_cnt_prep_process_time 0 zk_sum_prep_process_time 0 zk_avg_pending_session_queue_size 1.0 zk_min_pending_session_queue_size 1 zk_max_pending_session_queue_size 1 zk_cnt_pending_session_queue_size 1 zk_sum_pending_session_queue_size 1 zk_avg_time_waiting_empty_pool_in_commit_processor_read_ms 0.0 zk_min_time_waiting_empty_pool_in_commit_processor_read_ms 0 zk_max_time_waiting_empty_pool_in_commit_processor_read_ms 0 zk_cnt_time_waiting_empty_pool_in_commit_processor_read_ms 5 zk_sum_time_waiting_empty_pool_in_commit_processor_read_ms 0 zk_avg_commit_process_time 0.4074 zk_min_commit_process_time 0 zk_max_commit_process_time 5 zk_cnt_commit_process_time 27 zk_sum_commit_process_time 11 zk_avg_dbinittime 19.0 zk_min_dbinittime 19 zk_max_dbinittime 19 zk_cnt_dbinittime 1 zk_sum_dbinittime 19 zk_avg_inflight_diff_count 0.0 zk_min_inflight_diff_count 0 zk_max_inflight_diff_count 0 zk_cnt_inflight_diff_count 0 zk_sum_inflight_diff_count 0 zk_avg_netty_queued_buffer_capacity 0.0 zk_min_netty_queued_buffer_capacity 0 zk_max_netty_queued_buffer_capacity 0 zk_cnt_netty_queued_buffer_capacity 0 zk_sum_netty_queued_buffer_capacity 0 zk_avg_election_time 46.0 zk_min_election_time 46 zk_max_election_time 46 zk_cnt_election_time 1 zk_sum_election_time 46 zk_avg_commit_commit_proc_req_queued 0.1852 zk_min_commit_commit_proc_req_queued 0 zk_max_commit_commit_proc_req_queued 1 zk_cnt_commit_commit_proc_req_queued 27 zk_sum_commit_commit_proc_req_queued 5 zk_avg_sync_processor_batch_size 1.0 zk_min_sync_processor_batch_size 1 zk_max_sync_processor_batch_size 1 zk_cnt_sync_processor_batch_size 5 zk_sum_sync_processor_batch_size 5 zk_avg_node_children_watch_count 0.0 zk_min_node_children_watch_count 0 k_max_node_children_watch_count 0 zk_cnt_node_children_watch_count 0 zk_sum_node_children_watch_count 0 zk_avg_write_batch_time_in_commit_processor 1.0 zk_min_write_batch_time_in_commit_processor 0 zk_max_write_batch_time_in_commit_processor 5 zk_cnt_write_batch_time_in_commit_processor 5 zk_sum_write_batch_time_in_commit_processor 5 zk_avg_read_commit_proc_issued 0.7778 zk_min_read_commit_proc_issued 0 zk_max_read_commit_proc_issued 1 zk_cnt_read_commit_proc_issued 27 zk_sum_read_commit_proc_issued 21 zk_avg_concurrent_request_processing_in_commit_processor 0.0 zk_min_concurrent_request_processing_in_commit_processor 0 zk_max_concurrent_request_processing_in_commit_processor 0 zk_cnt_concurrent_request_processing_in_commit_processor 0 zk_sum_concurrent_request_processing_in_commit_processor 0 zk_avg_node_changed_watch_count 0.0 zk_min_node_changed_watch_count 0 zk_max_node_changed_watch_count 0 zk_cnt_node_changed_watch_count 0 zk_sum_node_changed_watch_count 0 zk_avg_sync_process_time 0.2 zk_min_sync_process_time 0 zk_max_sync_process_time 1 zk_cnt_sync_process_time 5 zk_sum_sync_process_time 1 zk_avg_startup_snap_load_time 6.0 zk_min_startup_snap_load_time 6 zk_max_startup_snap_load_time 6 zk_cnt_startup_snap_load_time 1 zk_sum_startup_snap_load_time 6 zk_avg_prep_processor_queue_time_ms 0.0 zk_min_prep_processor_queue_time_ms 0 zk_max_prep_processor_queue_time_ms 0 zk_cnt_prep_processor_queue_time_ms 0 zk_sum_prep_processor_queue_time_ms 0 zk_p50_prep_processor_queue_time_ms 0 zk_p95_prep_processor_queue_time_ms 0 zk_p99_prep_processor_queue_time_ms 0 zk_p999_prep_processor_queue_time_ms 0 zk_avg_jvm_pause_time_ms 0.0 zk_min_jvm_pause_time_ms 0 zk_max_jvm_pause_time_ms 0 zk_cnt_jvm_pause_time_ms 0 zk_sum_jvm_pause_time_ms 0 zk_p50_jvm_pause_time_ms 0 zk_p95_jvm_pause_time_ms 0 zk_p99_jvm_pause_time_ms 0 zk_p999_jvm_pause_time_ms 0 zk_avg_close_session_prep_time 0.0 zk_min_close_session_prep_time 0 zk_max_close_session_prep_time 0 zk_cnt_close_session_prep_time 0 zk_sum_close_session_prep_time 0 zk_p50_close_session_prep_time 0 zk_p95_close_session_prep_time 0 zk_p99_close_session_prep_time 0 zk_p999_close_session_prep_time 0 zk_avg_read_commitproc_time_ms 0.2857 zk_min_read_commitproc_time_ms 0 zk_max_read_commitproc_time_ms 1 zk_cnt_read_commitproc_time_ms 21 zk_sum_read_commitproc_time_ms 6 zk_p50_read_commitproc_time_ms 0 zk_p95_read_commitproc_time_ms 1 zk_p99_read_commitproc_time_ms 1 zk_p999_read_commitproc_time_ms 1 zk_avg_updatelatency 11.0 zk_min_updatelatency 11 zk_max_updatelatency 11 zk_cnt_updatelatency 1 zk_sum_updatelatency 11 zk_p50_updatelatency 11 zk_p95_updatelatency 11 zk_p99_updatelatency 11 zk_p999_updatelatency 11 zk_avg_local_write_committed_time_ms 1.0 zk_min_local_write_committed_time_ms 1 zk_max_local_write_committed_time_ms 1 zk_cnt_local_write_committed_time_ms 1 zk_sum_local_write_committed_time_ms 1 zk_p50_local_write_committed_time_ms 1 zk_p95_local_write_committed_time_ms 1 zk_p99_local_write_committed_time_ms 1 zk_p999_local_write_committed_time_ms 1 zk_avg_request_throttle_queue_time_ms 0.1818 zk_min_request_throttle_queue_time_ms 0 zk_max_request_throttle_queue_time_ms 1 zk_cnt_request_throttle_queue_time_ms 22 zk_sum_request_throttle_queue_time_ms 4 zk_p50_request_throttle_queue_time_ms 0 zk_p95_request_throttle_queue_time_ms 1 zk_p99_request_throttle_queue_time_ms 1 zk_p999_request_throttle_queue_time_ms 1 zk_avg_readlatency 0.6667 zk_min_readlatency 0 zk_max_readlatency 2 zk_cnt_readlatency 21 zk_sum_readlatency 14 zk_p50_readlatency 1 zk_p95_readlatency 2 zk_p99_readlatency 2 zk_p999_readlatency 2 zk_avg_quorum_ack_latency 0.0 zk_min_quorum_ack_latency 0 zk_max_quorum_ack_latency 0 zk_cnt_quorum_ack_latency 0 zk_sum_quorum_ack_latency 0 zk_p50_quorum_ack_latency 0 zk_p95_quorum_ack_latency 0 zk_p99_quorum_ack_latency 0 zk_p999_quorum_ack_latency 0 zk_avg_om_commit_process_time_ms 0.0 zk_min_om_commit_process_time_ms 0 zk_max_om_commit_process_time_ms 0 zk_cnt_om_commit_process_time_ms 0 zk_sum_om_commit_process_time_ms 0 zk_p50_om_commit_process_time_ms 0 zk_p95_om_commit_process_time_ms 0 zk_p99_om_commit_process_time_ms 0 zk_p999_om_commit_process_time_ms 0 zk_avg_read_final_proc_time_ms 0.2381 zk_min_read_final_proc_time_ms 0 zk_max_read_final_proc_time_ms 2 zk_cnt_read_final_proc_time_ms 21 zk_sum_read_final_proc_time_ms 5 zk_p50_read_final_proc_time_ms 0 zk_p95_read_final_proc_time_ms 2 zk_p99_read_final_proc_time_ms 2 zk_p999_read_final_proc_time_ms 2 zk_avg_commit_propagation_latency 5.4 zk_min_commit_propagation_latency 3 zk_max_commit_propagation_latency 11 zk_cnt_commit_propagation_latency 5 zk_sum_commit_propagation_latency 27 zk_p50_commit_propagation_latency 4 zk_p95_commit_propagation_latency 11 zk_p99_commit_propagation_latency 11 zk_p999_commit_propagation_latency 11 zk_avg_dead_watchers_cleaner_latency 0.0 zk_min_dead_watchers_cleaner_latency 0 zk_max_dead_watchers_cleaner_latency 0 zk_cnt_dead_watchers_cleaner_latency 0 zk_sum_dead_watchers_cleaner_latency 0 zk_p50_dead_watchers_cleaner_latency 0 zk_p95_dead_watchers_cleaner_latency 0 zk_p99_dead_watchers_cleaner_latency 0 zk_p999_dead_watchers_cleaner_latency 0 zk_avg_write_final_proc_time_ms 1.0 zk_min_write_final_proc_time_ms 0 zk_max_write_final_proc_time_ms 5 zk_cnt_write_final_proc_time_ms 5 zk_sum_write_final_proc_time_ms 5 zk_p50_write_final_proc_time_ms 0 zk_p95_write_final_proc_time_ms 5 zk_p99_write_final_proc_time_ms 5 zk_p999_write_final_proc_time_ms 5 zk_avg_proposal_ack_creation_latency 4.6 zk_min_proposal_ack_creation_latency 2 zk_max_proposal_ack_creation_latency 13 zk_cnt_proposal_ack_creation_latency 5 zk_sum_proposal_ack_creation_latency 23 zk_p50_proposal_ack_creation_latency 3 zk_p95_proposal_ack_creation_latency 13 zk_p99_proposal_ack_creation_latency 13 zk_p999_proposal_ack_creation_latency 13 zk_avg_proposal_latency 2.2 zk_min_proposal_latency 2 zk_max_proposal_latency 3 zk_cnt_proposal_latency 5 zk_sum_proposal_latency 11 zk_p50_proposal_latency 2 zk_p95_proposal_latency 3 zk_p99_proposal_latency 3 zk_p999_proposal_latency 3 zk_avg_om_proposal_process_time_ms 0.0 zk_min_om_proposal_process_time_ms 0 zk_max_om_proposal_process_time_ms 0 zk_cnt_om_proposal_process_time_ms 0 zk_sum_om_proposal_process_time_ms 0 zk_p50_om_proposal_process_time_ms 0 zk_p95_om_proposal_process_time_ms 0 zk_p99_om_proposal_process_time_ms 0 zk_p999_om_proposal_process_time_ms 0 zk_avg_sync_processor_queue_and_flush_time_ms 2.8 zk_min_sync_processor_queue_and_flush_time_ms 0 zk_max_sync_processor_queue_and_flush_time_ms 11 zk_cnt_sync_processor_queue_and_flush_time_ms 5 zk_sum_sync_processor_queue_and_flush_time_ms 14 zk_p50_sync_processor_queue_and_flush_time_ms 1 zk_p95_sync_processor_queue_and_flush_time_ms 11 zk_p99_sync_processor_queue_and_flush_time_ms 11 zk_p999_sync_processor_queue_and_flush_time_ms 11 zk_avg_propagation_latency 5.8 zk_min_propagation_latency 4 zk_max_propagation_latency 12 zk_cnt_propagation_latency 5 zk_sum_propagation_latency 29 zk_p50_propagation_latency 4 zk_p95_propagation_latency 12 zk_p99_propagation_latency 12 zk_p999_propagation_latency 12 zk_avg_server_write_committed_time_ms 0.5 zk_min_server_write_committed_time_ms 0 zk_max_server_write_committed_time_ms 1 zk_cnt_server_write_committed_time_ms 4 zk_sum_server_write_committed_time_ms 2 zk_p50_server_write_committed_time_ms 1 zk_p95_server_write_committed_time_ms 1 zk_p99_server_write_committed_time_ms 1 zk_p999_server_write_committed_time_ms 1 zk_avg_sync_processor_queue_time_ms 0.0 zk_min_sync_processor_queue_time_ms 0 zk_max_sync_processor_queue_time_ms 0 zk_cnt_sync_processor_queue_time_ms 5 zk_sum_sync_processor_queue_time_ms 0 zk_p50_sync_processor_queue_time_ms 0 zk_p95_sync_processor_queue_time_ms 0 zk_p99_sync_processor_queue_time_ms 0 zk_p999_sync_processor_queue_time_ms 0 zk_avg_sync_processor_queue_flush_time_ms 2.6 zk_min_sync_processor_queue_flush_time_ms 0 zk_max_sync_processor_queue_flush_time_ms 10 zk_cnt_sync_processor_queue_flush_time_ms 5 zk_sum_sync_processor_queue_flush_time_ms 13 zk_p50_sync_processor_queue_flush_time_ms 1 zk_p95_sync_processor_queue_flush_time_ms 10 zk_p99_sync_processor_queue_flush_time_ms 10 zk_p999_sync_processor_queue_flush_time_ms 10 zk_avg_write_commitproc_time_ms 9.0 zk_min_write_commitproc_time_ms 9 zk_max_write_commitproc_time_ms 9 zk_cnt_write_commitproc_time_ms 1 zk_sum_write_commitproc_time_ms 9 zk_p50_write_commitproc_time_ms 9 zk_p95_write_commitproc_time_ms 9 zk_p99_write_commitproc_time_ms 9 zk_p999_write_commitproc_time_ms 9 zk_avg_app_read_per_namespace 72.0 zk_min_app_read_per_namespace 72 zk_max_app_read_per_namespace 72 zk_cnt_app_read_per_namespace 1 zk_sum_app_read_per_namespace 72 zk_avg_app_write_per_namespace 8.5 zk_min_app_write_per_namespace 4 zk_max_app_write_per_namespace 15 zk_cnt_app_write_per_namespace 8 zk_sum_app_write_per_namespace 68 zk_avg_zookeeper_write_per_namespace 188.0 zk_min_zookeeper_write_per_namespace 188 zk_max_zookeeper_write_per_namespace 188 zk_cnt_zookeeper_write_per_namespace 2 zk_sum_zookeeper_write_per_namespace 376 zk_avg_application_write_per_namespace 16.0 zk_min_application_write_per_namespace 12 zk_max_application_write_per_namespace 22 zk_cnt_application_write_per_namespace 4 zk_sum_application_write_per_namespace 64
Check if server is running in read-only mode.
$ echo isro | nc zookeeper3.example.org 2181; echo
rw
I have omitted some options like gtmk, stmk as tracing deserves its own blog post.