Server

Redis SERVER Data Structure

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Redis SERVER Data Structure

레디스 서버 데이터 구조를 설명한다.

이 문서는 버전 3.2.2을 기준으로 만들었다.

redisServer

초기화 function: initServerConfig()

structure redisServer

No	Data Type	Name	설명
General
1	pid_t	pid	Main process pid.
2	char	*configfile	Absolute config file path, or NULL
3	char	*executable	Absolute executable file path.
4	char	**exec_argv	Executable argv vector (copy).
5	int	hz	serverCron() calls frequency in hertz.
6	redisDb	*db
7	dict	*commands	Command table
8	dict	*orig_commands	Command table before command renaming.
9	aeEventLoop	*el
10	unsigned	lruclock:LRU_BITS	Clock for LRU eviction
11	int	shutdown_asap	SHUTDOWN needed ASAP
12	int	activerehashing	Incremental rehash in serverCron()
13	char	*requirepass	Pass for AUTH command, or NULL
14	char	*pidfile	PID file path
15	int	arch_bits	32 or 64 depending on sizeof(long)
16	int	cronloops	Number of times the cron function run
17	char	runid [CONFIG_RUN_ID_SIZE+1]	ID always different at every exec.
18	int	sentinel_mode	True if this instance is a Sentinel.
Networking
19	int	port	TCP listening port
20	int	tcp_backlog	TCP listen() backlog
21	char	*bindaddr [CONFIG_BINDADDR_MAX]	Addresses we should bind to
22	int	bindaddr_count	Number of addresses in server.bindaddr[]
23	char	*unixsocket	UNIX socket path
24	mode_t	unixsocketperm	UNIX socket permission
25	int	ipfd [CONFIG_BINDADDR_MAX]	TCP socket file descriptors
26	int	ipfd_count	Used slots in ipfd[]
27	int	sofd	Unix socket file descriptor
28	int	cfd [CONFIG_BINDADDR_MAX]	Cluster bus listening socket
29	int	cfd_count	Used slots in cfd[]
30	list	*clients	List of active clients
31	list	*clients_to_close	Clients to close asynchronously
32	list	*clients_pending_write	There is to write or install handler.
33	list	*slaves	List of slaves
34	list	*monitors	List of MONITORs
35	client	*current_client	Current client, only used on crash report
36	int	clients_paused	True if clients are currently paused
37	mstime_t	clients_pause_end_time	Time when we undo clients_paused
38	char	neterr[ANET_ERR_LEN]	Error buffer for anet.c
39	dict	*migrate_cached_sockets	MIGRATE cached sockets
40	uint64_t	next_client_id	Next client unique ID. Incremental.
41	int	protected_mode	Don't accept external connections.
RDB / AOF loading information
42	int	loading	We are loading data from disk if true
43	off_t	loading_total_bytes
44	off_t	loading_loaded_bytes
45	time_t	loading_start_time
46	off_t	loading_process_events _interval_bytes
Fast pointers to often looked up command
47	struct redisCommand	*delCommand
48	struct redisCommand	*multiCommand
49	struct redisCommand	*lpushCommand
50	struct redisCommand	*lpopCommand
51	struct redisCommand	*rpopCommand
52	struct redisCommand	*sremCommand
53	struct redisCommand	*execCommand
Fields used only for stats
54	time_t	stat_starttime	Server start time
55	long long	stat_numcommands	Number of processed commands
56	long long	stat_numconnections	Number of connections received
57	long long	stat_expiredkeys	Number of expired keys
58	long long	stat_evictedkeys	Number of evicted keys (maxmemory)
59	long long	stat_keyspace_hits	Number of successful lookups of keys
60	long long	stat_keyspace_misses	Number of failed lookups of keys
61	size_t	stat_peak_memory	Max used memory record
62	long long	stat_fork_time	Time needed to perform latest fork()
63	double	stat_fork_rate	Fork rate in GB/sec.
64	long long	stat_rejected_conn	Clients rejected because of maxclients
65	long long	stat_sync_full	Number of full resyncs with slaves.
66	long long	stat_sync_partial_ok	Number of accepted PSYNC requests.
67	long long	stat_sync_partial_err	Number of unaccepted PSYNC requests.
68	list	*slowlog	SLOWLOG list of commands
69	long long	slowlog_entry_id	SLOWLOG current entry ID
70	long long	slowlog_log_slower_than	SLOWLOG time limit (to get logged)
71	unsigned long	slowlog_max_len	SLOWLOG max number of items logged
72	size_t	resident_set_size	RSS sampled in serverCron().
73	long long	stat_net_input_bytes	Bytes read from network.
74	long long	stat_net_output_bytes	Bytes written to network.
The following two are used to track instantaneous metrics, like number of operations per second, network traffic.
75	struct { long long last_sample_time; /* Timestamp of last sample in ms / long long last_sample_count;/ Count in last sample */ long long samples[STATS_METRIC_SAMPLES]; int idx; } inst_metric[STATS_METRIC_COUNT];
Configuration
76	int	verbosity	Loglevel in redis.conf
77	int	maxidletime	Client timeout in seconds
78	int	tcpkeepalive	Set SO_KEEPALIVE if non-zero.
79	int	active_expire_enabled	Can be disabled for testing purposes.
80	size_t	client_max_querybuf_len	Limit for client query buffer length
81	int	dbnum	Total number of configured DBs
82	int	supervised	1 if supervised, 0 otherwise.
83	int	supervised_mode	See SUPERVISED_*
84	int	daemonize	True if running as a daemon
85	clientBufferLimitsConfig	client_obuf_limits [CLIENT_TYPE_OBUF_COUNT]
AOF persistence
86	int	aof_state	AOF_(ON\|OFF\|WAIT_REWRITE)
87	int	aof_fsync	Kind of fsync() policy
88	char	*aof_filename	Name of the AOF file
89	int	aof_no_fsync_on_rewrite	Don't fsync if a rewrite is in prog.
90	int	aof_rewrite_perc	Rewrite AOF if % growth is > M and...
91	off_t	aof_rewrite_min_size	the AOF file is at least N bytes.
92	off_t	aof_rewrite_base_size	AOF size on latest startup or rewrite.
93	off_t	aof_current_size	AOF current size.
94	int	aof_rewrite_scheduled	Rewrite once BGSAVE terminates.
95	pid_t	aof_child_pid	PID if rewriting process
96	list	*aof_rewrite_buf_blocks	Hold changes during an AOF rewrite.
97	sds	aof_buf	AOF buffer, written before entering the event loop
98	int	aof_fd	File descriptor of currently selected AOF file
98	int	aof_selected_db	Currently selected DB in AOF
100	time_t	aof_flush _postponed_start	UNIX time of postponed AOF flush
101	time_t	aof_last_fsync	UNIX time of last fsync()
102	time_t	aof_rewrite _time_last	Time used by last AOF rewrite run.
103	time_t	aof_rewrite _time_start	Current AOF rewrite start time.
104	int	aof_lastbgrewrite _status	C_OK or C_ERR
105	unsigned long	aof_delayed_fsync	delayed AOF fsync() counter
106	int	aof_rewrite _incremental_fsync	fsync incrementally while rewriting?
107	int	aof_last _write_status	C_OK or C_ERR
108	int	aof_last _write_errno	Valid if aof_last_write_status is ERR
109	int	aof_load _truncated	Don't stop on unexpected AOF EOF.
AOF pipes used to communicate between parent and child during rewrite.
110	int	aof_pipe_write_data_to_child
111	int	aof_pipe_read_data_from_parent
112	int	aof_pipe_write_ack_to_parent
113	int	aof_pipe_read_ack_from_child
114	int	aof_pipe_write_ack_to_child
115	int	aof_pipe_read_ack_from_parent
116	int	aof_stop_sending_diff	If true stop sending accumulated diffs to child process.
117	sds	aof_child_diff	AOF diff accumulator child side.
RDB persistence
118	long long	dirty	Changes to DB from the last save
119	long long	dirty_before_bgsave	Used to restore dirty on failed BGSAVE
120	pid_t	rdb_child_pid	PID of RDB saving child
121	struct saveparam	*saveparams	Save points array for RDB
122	int	saveparamslen	Number of saving points
123	char	*rdb_filename	Name of RDB file
124	int	rdb_compression	Use compression in RDB?
125	int	rdb_checksum	Use RDB checksum?
126	time_t	lastsave	Unix time of last successful save
127	time_t	lastbgsave_try	Unix time of last attempted bgsave
128	time_t	rdb_save_time_last	Time used by last RDB save run.
129	time_t	rdb_save_time_start	Current RDB save start time.
130	int	rdb_bgsave_scheduled	BGSAVE when possible if true.
131	int	rdb_child_type	Type of save by active child.
132	int	lastbgsave_status	C_OK or C_ERR
133	int	stop_writes_on _bgsave_err	Don't allow writes if can't BGSAVE
134	int	rdb_pipe_write _result_to_parent	RDB pipes used to return the state
135	int	rdb_pipe_read _result_from_child	of each slave in diskless SYNC.
Propagation of commands in AOF / replication
136	redisOpArray	also_propagate	Additional command to propagate.
Logging
137	char	*logfile	Path of log file
138	int	syslog_enabled	Is syslog enabled?
139	char	*syslog_ident	Syslog ident
140	int	syslog_facility	Syslog facility
Replication (master)
141	int	slaveseldb	Last SELECTed DB in replication output
142	long long	master_repl_offset	Global replication offset
143	int	repl_ping_slave_period	Master pings the slave every N seconds
144	char	*repl_backlog	Replication backlog for partial syncs
145	long long	repl_backlog_size	Backlog circular buffer size
146	long long	repl_backlog_histlen	Backlog actual data length
147	long long	repl_backlog_idx	Backlog circular buffer current offset
148	long long	repl_backlog_off	Replication offset of first byte in the backlog buffer.
149	time_t	repl_backlog_time_limit	Time without slaves after the backlog gets released.
150	time_t	repl_no_slaves_since	We have no slaves since that time. Only valid if server.slaves len is 0.
151	int	repl_min_slaves_to_write	Min number of slaves to write.
152	int	repl_min_slaves_max_lag	Max lag of slaves to write.
153	int	repl_good_slaves_count	Number of slaves with lag <= max_lag.
154	int	repl_diskless_sync	Send RDB to slaves sockets directly.
155	int	repl_diskless_sync_delay	Delay to start a diskless repl BGSAVE.
Replication (slave)
156	char	*masterauth	AUTH with this password with master
157	char	*masterhost	Hostname of master
158	int	masterport	Port of master
159	int	repl_timeout	Timeout after N seconds of master idle
160	client	*master	Client that is master for this slave
161	client	*cached_master	Cached master to be reused for PSYNC.
162	int	repl_syncio_timeout	Timeout for synchronous I/O calls
163	int	repl_state	Replication status if the instance is a slave
164	off_t	repl_transfer_size	Size of RDB to read from master during sync.
165	off_t	repl_transfer_read	Amount of RDB read from master during sync.
166	off_t	repl_transfer _last_fsync_off	Offset when we fsync-ed last time.
167	int	repl_transfer_s	Slave -> Master SYNC socket
168	int	repl_transfer_fd	Slave -> Master SYNC temp file descriptor
169	char	*repl_transfer_tmpfile	Slave-> master SYNC temp file name
170	time_t	repl_transfer_lastio	Unix time of the latest read, for timeout
171	int	repl_serve_stale_data	Serve stale data when link is down?
172	int	repl_slave_ro	Slave is read only?
173	time_t	repl_down_since	Unix time at which link with master went down
174	int	repl_disable_tcp_nodelay	Disable TCP_NODELAY after SYNC?
175	int	slave_priority	Reported in INFO and used by Sentinel.
176	int	slave_announce_port	Give the master this listening port.
177	char	*slave_announce_ip	Give the master this ip address.
178	char	repl_master_runid [CONFIG_RUN_ID_SIZE+1]	Master run id for PSYNC.
179	long long	repl_master _initial_offset	Master PSYNC offset.
Replication script cache.
180	dict	*repl_scriptcache_dict	SHA1 all slaves are aware of.
181	list	*repl_scriptcache_fifo	First in, first out LRU eviction.
182	unsigned int	repl_scriptcache_size	Max number of elements.
Synchronous replication.
183	list	*clients_waiting_acks	Clients waiting in WAIT command.
184	int	get_ack_from_slaves	If true we send REPLCONF GETACK.
Limits
185	unsigned int	maxclients	Max number of simultaneous clients
186	unsigned long long	maxmemory	Max number of memory bytes to use
187	int	maxmemory_policy	Policy for key eviction
188	int	maxmemory_samples	Pricision of random sampling
Blocked clients
189	unsigned int	bpop_blocked_clients	Number of clients blocked by lists
190	list	*unblocked_clients	list of clients to unblock before next loop
191	list	*ready_keys	List of readyList structures for BLPOP & co
Sort parameters - qsort_r() is only available under BSD so we have to take this state global, in order to pass it to sortCompare()
192	int	sort_desc
193	int	sort_alpha
194	int	sort_bypattern
195	int	sort_store
Zip structure config, see redis.conf for more information
196	size_t	hash_max_ziplist_entries
197	size_t	hash_max_ziplist_value
198	size_t	set_max_intset_entries
199	size_t	zset_max_ziplist_entries
200	size_t	zset_max_ziplist_value
201	size_t	hll_sparse_max_bytes
List parameters
202	list_max_ziplist_size
203	list_compress_depth
time cache
204	time_t	unixtime	Unix time sampled every cron cycle.
205	long long	mstime	Like 'unixtime' but with milliseconds resolution.
Pubsub
206	dict	*pubsub_channels	Map channels to list of subscribed clients
207	list	*pubsub_patterns	A list of pubsub_patterns
208	int	notify_keyspace _events	Events to propagate via Pub/Sub. This is an xor of NOTIFY_... flags.
Cluster
209	int	cluster_enabled	Is cluster enabled?
210	mstime_t	cluster_node_timeout	Cluster node timeout.
211	char	*cluster_configfile	Cluster auto-generated config file name.
212	struct clusterState		State of the cluster
213	int	cluster_migration _barrier	Cluster replicas migration barrier.
214	int	cluster_slave _validity_factor	Slave max data age for failover.
215	int	cluster_require _full_coverage	If true, put the cluster down if there is at least an uncovered slot.
Scripting
216	lua_State	*lua	The Lua interpreter. We use just one for all clients
217	client	*lua_client	The "fake client" to query Redis from Lua
218	client	*lua_caller	The client running EVAL right now, or NULL
219	dict	*lua_scripts	A dictionary of SHA1 -> Lua scripts
220	mstime_t	lua_time_limit	Script timeout in milliseconds
221	mstime_t	lua_time_start	Start time of script, milliseconds time
222	int	lua_write_dirty	True if a write command was called during the execution of the current script.
223	int	lua_random_dirty	True if a random command was called during the execution of the current script.
224	int	lua_replicate_commands	True if we are doing single commands repl.
225	int	lua_multi_emitted	True if we already proagated MULTI.
226	int	lua_repl	Script replication flags for redis.set_repl().
227	int	lua_timedout	True if we reached the time limit for script execution.
228	int	lua_kill	Kill the script if true.
229	int	lua_always_replicate_commands	Default replication type.
Latency monitor
230	long long	latency_monitor_threshold
231	dict	*latency_events
Assert & bug reporting
232	char	*assert_failed
233	char	*assert_file
234	int	assert_line
235	int	bug_report_start	True if bug report header was already logged.
236	int	watchdog_period	Software watchdog period in ms. 0 = off
System hardware info
237	size_t	system_memory_size	Total memory in system as reported by OS

structure clusterLink

No	Data Type	Name	설명
1	mstime_t	ctime	Link creation time
2	int	fd	TCP socket file descriptor
3	sds	sndbuf	Packet send buffer
4	sds	rcvbuf	Packet reception buffer
5	struct clusterNode	*node	Node related to this link if any, or NULL

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