Redis Blocked Clients
Clients becoming blocked due to slow operations (e.g., large BLPOP or BRPOP operations) or commands that block the Redis server, leading to service disruptions.
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What is Redis Blocked Clients
Identify the cause of blocked clients by checking the current blocking commands using the command: redis-cli monitor | grep -E "BLPOP|BRPOP|BRPOPLPUSH|BLMOVE|BZPOPMIN|BZPOPMAX". This helps in understanding if specific commands are causing the blockage.Use redis-cli info clients to get details about connected clients, including the number of currently blocked clients.Check the length of the list, stream, or other data structures involved in blocking operations to ensure they are not empty, which could cause clients to block indefinitely. Use commands like LLEN <key> for lists or XLEN <stream key> for streams.Increase the timeout parameter in blocking commands if clients are timing out too soon, ensuring they wait longer for an element to process.Evaluate and adjust the timeout settings in the Redis configuration (redis.conf) under timeout or tcp-keepalive settings to ensure clients are not being disconnected prematurely.If the blocked clients are due to resource constraints (e.g., CPU, memory), use redis-cli info memory and redis-cli info cpu to check the current usage and consider optimizing data usage or upgrading system resources.
Redis Blocked Clients
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