memory - Redis内存使用、ZSET和docker

Question

我在 docker(官方图像)上有一个 redis 实例 (3.2)，除了我每秒启动的脚本外，它几乎没有被使用，用于取消 ZSET 中潜在项目的排队。这是我的脚本:

local latestSchedule = redis.call('ZRANGEBYSCORE', KEYS[1], '-inf', 123456789, 'LIMIT', '0', '1')
if latestSchedule[1] == nil then return nil end
redis.call('ZREM', KEYS[1], latestSchedule[1])
return latestSchedule[1]

尽管这个 ZSET 大部分时间都是空的，但 Redis 正在吃越来越多的内存，高达 128MB，直到它重新启动并再次上升。

我错过了什么吗？redis 内存使用量是否通常在不执行任何操作的情况下增长？我的脚本不适合从 ZSET 中取消排队吗？我应该去别的地方看吗？

根据 Karthikeyan Gopall 的要求，这是 INFO，就在它达到 128MB 之前:

# Server
redis_version:3.2.0
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:5382f69a4e75566b
redis_mode:standalone
os:Linux 3.16.0-4-amd64 x86_64
arch_bits:64
multiplexing_api:epoll
gcc_version:4.9.2
process_id:1
run_id:4e22b73f22436677376b4d097746c2a30ba2b9bc
tcp_port:6379
uptime_in_seconds:21140
uptime_in_days:0
hz:10
lru_clock:6816977
executable:/data/redis-server
config_file:

# Clients
connected_clients:5
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0

# Memory
used_memory:33392560
used_memory_human:31.85M
used_memory_rss:125399040
used_memory_rss_human:119.59M
used_memory_peak:33473544
used_memory_peak_human:31.92M
total_system_memory:1787236352
total_system_memory_human:1.66G
used_memory_lua:67447808
used_memory_lua_human:64.32M
maxmemory:134217728
maxmemory_human:128.00M
maxmemory_policy:noeviction
mem_fragmentation_ratio:3.76
mem_allocator:jemalloc-4.0.3

# Persistence
loading:0
rdb_changes_since_last_save:162
rdb_bgsave_in_progress:0
rdb_last_save_time:1466413629
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:-1
rdb_current_bgsave_time_sec:-1
aof_enabled:1
aof_rewrite_in_progress:0
aof_rewrite_scheduled:0
aof_last_rewrite_time_sec:-1
aof_current_rewrite_time_sec:-1
aof_last_bgrewrite_status:ok
aof_last_write_status:ok
aof_current_size:1039856
aof_base_size:0
aof_pending_rewrite:0
aof_buffer_length:0
aof_rewrite_buffer_length:0
aof_pending_bio_fsync:0
aof_delayed_fsync:0

# Stats
total_connections_received:21174
total_commands_processed:339098
instantaneous_ops_per_sec:10
total_net_input_bytes:34329347
total_net_output_bytes:11702705
instantaneous_input_kbps:0.96
instantaneous_output_kbps:0.14
rejected_connections:0
sync_full:0
sync_partial_ok:0
sync_partial_err:0
expired_keys:24
evicted_keys:0
keyspace_hits:200
keyspace_misses:84628
pubsub_channels:0
pubsub_patterns:0
latest_fork_usec:0
migrate_cached_sockets:0

# Replication
role:master
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

# CPU
used_cpu_sys:27.75
used_cpu_user:21.72
used_cpu_sys_children:0.00
used_cpu_user_children:0.00

# Cluster
cluster_enabled:0

# Keyspace
db0:keys=47,expires=47,avg_ttl=17584379

就在它重新启动时:

# Server
redis_version:3.2.0
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:5382f69a4e75566b
redis_mode:standalone
os:Linux 3.16.0-4-amd64 x86_64
arch_bits:64
multiplexing_api:epoll
gcc_version:4.9.2
process_id:1
run_id:4e22b73f22436677376b4d097746c2a30ba2b9bc
tcp_port:6379
uptime_in_seconds:21140
uptime_in_days:0
hz:10
lru_clock:6816977
executable:/data/redis-server
config_file:

# Clients
connected_clients:5
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0

# Memory
used_memory:33392560
used_memory_human:31.85M
used_memory_rss:125399040
used_memory_rss_human:119.59M
used_memory_peak:33473544
used_memory_peak_human:31.92M
total_system_memory:1787236352
total_system_memory_human:1.66G
used_memory_lua:67447808
used_memory_lua_human:64.32M
maxmemory:134217728
maxmemory_human:128.00M
maxmemory_policy:noeviction
mem_fragmentation_ratio:3.76
mem_allocator:jemalloc-4.0.3

# Persistence
loading:0
rdb_changes_since_last_save:162
rdb_bgsave_in_progress:0
rdb_last_save_time:1466413629
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:-1
rdb_current_bgsave_time_sec:-1
aof_enabled:1
aof_rewrite_in_progress:0
aof_rewrite_scheduled:0
aof_last_rewrite_time_sec:-1
aof_current_rewrite_time_sec:-1
aof_last_bgrewrite_status:ok
aof_last_write_status:ok
aof_current_size:1039856
aof_base_size:0
aof_pending_rewrite:0
aof_buffer_length:0
aof_rewrite_buffer_length:0
aof_pending_bio_fsync:0
aof_delayed_fsync:0

# Stats
total_connections_received:21174
total_commands_processed:339098
instantaneous_ops_per_sec:10
total_net_input_bytes:34329347
total_net_output_bytes:11702705
instantaneous_input_kbps:0.96
instantaneous_output_kbps:0.14
rejected_connections:0
sync_full:0
sync_partial_ok:0
sync_partial_err:0
expired_keys:24
evicted_keys:0
keyspace_hits:200
keyspace_misses:84628
pubsub_channels:0
pubsub_patterns:0
latest_fork_usec:0
migrate_cached_sockets:0

# Replication
role:master
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

# CPU
used_cpu_sys:27.75
used_cpu_user:21.72
used_cpu_sys_children:0.00
used_cpu_user_children:0.00

# Cluster
cluster_enabled:0

# Keyspace
db0:keys=47,expires=47,avg_ttl=17584379

Answer 1

你的理解是错误的。这里 ma​​xmemory_human:128.00M 表示根据您的配置，redis 可以占用的最大内存(您可以在 redis.conf 文件中更改它，您的当前值为 134217728 字节，即 128 MB)。如果您的内存使用量超出此范围，redis 将根据您的逐出策略 (ma​​xmemory_policy:noeviction) 开始抛出内存不足错误

redis当前使用的内存需要查看used_memory_human:31.85M。

# Keyspace
db0:keys=47,expires=47,avg_ttl=17584379

服务器中有 46 个 key ，我想这是正常内存。

您可以在此链接 http://redis.io/commands/INFO 中的信息命令中查看有关每个值的更多详细信息.

希望这对您有所帮助。