jedis psubscribe causes application to hang

Question

I'm using redis 2.8.19 and jedis 2.6.0

pool = new JedisPool( new JedisPoolConfig(), "ip", 6379, 0 );
        System.out.println( "test2" );
        Jedis jedis = pool.getResource();
        jedis.psubscribe( new KeyExpiredListener(), "__key*__:*" );
        pool.returnResource( jedis );
        System.out.println( "test3" );

output:

test2

The app seems to hang when i try to subscribe to a channel. So the question I pose is why is my application hanging because of this.

Well, I was wondering what would cause the application to hang. — Effective Light, Feb 13 '15 at 16:27
Just as a side note, I am able to use GET, SET and EXISTS commands just fine. — Effective Light, Feb 13 '15 at 16:30

score 2 · Answer 1 · answered Dec 28 '17 at 05:21

2

psubscribe is a blocking operation. You need to execute the psubscribe call on a seperate thread.

answered Dec 28 '17 at 05:21

betaboy00

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score 0 · Accepted Answer · answered Feb 16 '15 at 05:52

0

Fixed this by setting notify-keyspace-events to Ex in the redis.conf

and listening to "__keyevent@0__:*"

jedis.psubscribe( new KeyExpiredListener(), "__keyevent@0__:*" );

answered Feb 16 '15 at 05:52

Effective Light

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jedis psubscribe causes application to hang

2 Answers2