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Update clickhouse-keeper.md
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@ -54,7 +54,6 @@ Internal coordination settings are located in `<keeper_server>.<coordination_set
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- `auto_forwarding` — Allow to forward write requests from followers to the leader (default: true).
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- `shutdown_timeout` — Wait to finish internal connections and shutdown (ms) (default: 5000).
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- `startup_timeout` — If the server doesn't connect to other quorum participants in the specified timeout it will terminate (ms) (default: 30000).
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- `four_letter_word_white_list` — White list of 4lw commands (default: "conf,cons,crst,envi,ruok,srst,srvr,stat,wchc,wchs,dirs,mntr,isro").
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Quorum configuration is located in `<keeper_server>.<raft_configuration>` section and contain servers description.
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@ -110,196 +109,6 @@ ClickHouse Keeper is bundled into the ClickHouse server package, just add config
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clickhouse-keeper --config /etc/your_path_to_config/config.xml --daemon
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```
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## Four Letter Word Commands
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ClickHouse Keeper also provides 4lw commands which are almost the same with Zookeeper. Each command is composed of four letters such as `mntr`, `stat` etc. There are some more interesting commands: `stat` gives some general information about the server and connected clients, while `srvr` and `cons` give extended details on server and connections respectively.
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The 4lw commands has a white list configuration `four_letter_word_white_list` which has default value "conf,cons,crst,envi,ruok,srst,srvr,stat,wchc,wchs,dirs,mntr,isro".
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You can issue the commands to ClickHouse Keeper via telnet or nc, at the client port.
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```
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echo mntr | nc localhost 9181
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```
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Bellow is the detailed 4lw commands:
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- ruok : Tests if server is running in a non-error state. The server will respond with imok if it is running. Otherwise it will not respond at all. A response of "imok" does not necessarily indicate that the server has joined the quorum, just that the server process is active and bound to the specified client port. Use "stat" for details on state wrt quorum and client connection information.
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```
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imok
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```
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- mntr : Outputs a list of variables that could be used for monitoring the health of the cluster.
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```
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zk_version v21.11.1.1-prestable-7a4a0b0edef0ad6e0aa662cd3b90c3f4acf796e7
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zk_avg_latency 0
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zk_max_latency 0
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zk_min_latency 0
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zk_packets_received 68
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zk_packets_sent 68
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zk_num_alive_connections 1
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zk_outstanding_requests 0
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zk_server_state leader
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zk_znode_count 4
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zk_watch_count 1
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zk_ephemerals_count 0
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zk_approximate_data_size 723
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zk_open_file_descriptor_count 310
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zk_max_file_descriptor_count 10240
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zk_followers 0
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zk_synced_followers 0
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```
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- srvr : Lists full details for the server.
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```
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ClickHouse Keeper version: v21.11.1.1-prestable-7a4a0b0edef0ad6e0aa662cd3b90c3f4acf796e7
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Latency min/avg/max: 0/0/0
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Received: 2
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Sent : 2
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Connections: 1
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Outstanding: 0
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Zxid: 34
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Mode: leader
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Node count: 4
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```
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- stat : Lists brief details for the server and connected clients.
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```
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ClickHouse Keeper version: v21.11.1.1-prestable-7a4a0b0edef0ad6e0aa662cd3b90c3f4acf796e7
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Clients:
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192.168.1.1:52852(recved=0,sent=0)
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192.168.1.1:52042(recved=24,sent=48)
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Latency min/avg/max: 0/0/0
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Received: 4
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Sent : 4
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Connections: 1
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Outstanding: 0
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Zxid: 36
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Mode: leader
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Node count: 4
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```
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- srst : Reset server statistics. The command will affect the result of `srvr`, `mntr` and `stat`.
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```
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Server stats reset.
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```
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- conf : Print details about serving configuration.
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```
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server_id=1
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tcp_port=2181
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four_letter_word_white_list=*
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log_storage_path=./coordination/logs
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snapshot_storage_path=./coordination/snapshots
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max_requests_batch_size=100
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session_timeout_ms=30000
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operation_timeout_ms=10000
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dead_session_check_period_ms=500
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heart_beat_interval_ms=500
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election_timeout_lower_bound_ms=1000
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election_timeout_upper_bound_ms=2000
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reserved_log_items=1000000000000000
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snapshot_distance=10000
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auto_forwarding=true
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shutdown_timeout=5000
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startup_timeout=240000
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raft_logs_level=information
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snapshots_to_keep=3
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rotate_log_storage_interval=100000
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stale_log_gap=10000
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fresh_log_gap=200
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max_requests_batch_size=100
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quorum_reads=false
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force_sync=false
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compress_logs=true
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compress_snapshots_with_zstd_format=true
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configuration_change_tries_count=20
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```
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- cons : List full connection/session details for all clients connected to this server. Includes information on numbers of packets received/sent, session id, operation latencies, last operation performed, etc...
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```
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192.168.1.1:52163(recved=0,sent=0,sid=0xffffffffffffffff,lop=NA,est=1636454787393,to=30000,lzxid=0xffffffffffffffff,lresp=0,llat=0,minlat=0,avglat=0,maxlat=0)
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192.168.1.1:52042(recved=9,sent=18,sid=0x0000000000000001,lop=List,est=1636454739887,to=30000,lcxid=0x0000000000000005,lzxid=0x0000000000000005,lresp=1636454739892,llat=0,minlat=0,avglat=0,maxlat=0)
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```
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- crst : Reset connection/session statistics for all connections.
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```
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Connection stats reset.
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```
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- envi : Print details about serving environment
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```
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Environment:
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clickhouse.keeper.version=v21.11.1.1-prestable-7a4a0b0edef0ad6e0aa662cd3b90c3f4acf796e7
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host.name=ZBMAC-C02D4054M.local
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os.name=Darwin
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os.arch=x86_64
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os.version=19.6.0
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cpu.count=12
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user.name=root
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user.home=/Users/JackyWoo/
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user.dir=/Users/JackyWoo/project/jd/clickhouse/cmake-build-debug/programs/
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user.tmp=/var/folders/b4/smbq5mfj7578f2jzwn602tt40000gn/T/
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```
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- dirs : Shows the total size of snapshot and log files in bytes
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```
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snapshot_dir_size: 0
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log_dir_size: 3875
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```
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- isro: Tests if server is running in read-only mode. The server will respond with "ro" if in read-only mode or "rw" if not in read-only mode.
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```
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rw
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```
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- wchs : Lists brief information on watches for the server.
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```
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1 connections watching 1 paths
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Total watches:1
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```
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- wchc : Lists detailed information on watches for the server, by session. This outputs a list of sessions(connections) with associated watches (paths). Note, depending on the number of watches this operation may be expensive (ie impact server performance), use it carefully.
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```
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0x0000000000000001
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/clickhouse/task_queue/ddl
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```
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- wchp : Lists detailed information on watches for the server, by path. This outputs a list of paths (znodes) with associated sessions. Note, depending on the number of watches this operation may be expensive (ie impact server performance), use it carefully.
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```
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/clickhouse/task_queue/ddl
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0x0000000000000001
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```
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- dump : Lists the outstanding sessions and ephemeral nodes. This only works on the leader.
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```
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Sessions dump (2):
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0x0000000000000001
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0x0000000000000002
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Sessions with Ephemerals (1):
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0x0000000000000001
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/clickhouse/task_queue/ddl
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```
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## [experimental] Migration from ZooKeeper
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Seamlessly migration from ZooKeeper to ClickHouse Keeper is impossible you have to stop your ZooKeeper cluster, convert data and start ClickHouse Keeper. `clickhouse-keeper-converter` tool allows converting ZooKeeper logs and snapshots to ClickHouse Keeper snapshot. It works only with ZooKeeper > 3.4. Steps for migration:
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