spring-projects / spring-projects/spring-session

Why are there so many redis requests happening?

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Description

I'm using Spring Boot 2.0.3 and spring-session-data-redis:2.0.3. It all works fine, sessions states are stored in redis. But as my app is not live yet I'm a bit concerned when it comes to it's performance. Using the redis-cli command monitor it came to my attention that for even single requests with one user in a single browser window there are a lot of redis requests fired.

As an example I logged in with a user into my webapp and then deleted all his session info in redis via redis-cli flushall. When I now refresh the browser window I can see the following in redis-cli monitor:

1536236839.825347 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.879350 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.880350 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.880350 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.881350 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.882350 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.883350 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.892351 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.892351 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.905352 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.906352 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.907352 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.907352 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.911352 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.954354 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.954354 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.955355 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.956355 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"
1536236839.971355 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:9bbc613b-dbb6-4eb3-afe0-2970fc3d36ee"

That's all for a single browser refresh action! Is this normal?

When I'm correctly logged in with a user and do not delete it's redis state it's even worse:

1536236969.691775 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.706776 [0 127.0.0.1:55800] "GET" "io.lazyfox.caching.L2PermanentNotificationCache;16"
1536236969.709776 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xde\xdd"
1536236969.709776 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.709776 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.710776 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.710776 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236969.710776 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236969.710776 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.717777 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.734777 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.738778 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf\x06"
1536236969.738778 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.738778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.738778 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.738778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236969.739778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236969.739778 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.740778 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.740778 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.740778 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.742778 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf\x0c"
1536236969.742778 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.742778 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf\x0c"
1536236969.742778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.742778 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.742778 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.742778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.743778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236969.743778 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.743778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236969.743778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236969.743778 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.743778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236969.743778 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.744778 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf\x0e"
1536236969.745778 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.748778 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf\x11"
1536236969.748778 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.748778 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.748778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.748778 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.749778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236969.749778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236969.749778 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.750778 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.753779 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.756779 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.756779 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236969.756779 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236969.756779 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.762779 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.764779 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf\""
1536236969.764779 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.765779 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.765779 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.765779 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.767779 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236969.767779 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.767779 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236969.768779 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.769780 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf'"
1536236969.769780 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.770780 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.770780 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.770780 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236969.770780 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.770780 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236969.772780 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.772780 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.773780 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.774780 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.774780 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.775780 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.775780 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf."
1536236969.776780 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236969.776780 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236969.776780 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xdf/"
1536236969.776780 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236969.776780 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
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1536236969.924788 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236970.109799 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236970.111799 [0 127.0.0.1:55800] "HMSET" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "lastAccessedTime" "\xac\xed\x00\x05sr\x00\x0ejava.lang.Long;\x8b\xe4\x90\xcc\x8f#\xdf\x02\x00\x01J\x00\x05valuexr\x00\x10java.lang.Number\x86\xac\x95\x1d\x0b\x94\xe0\x8b\x02\x00\x00xp\x00\x00\x01e\xae\xdb\xe0}"
1536236970.112799 [0 127.0.0.1:55800] "SADD" "spring;session:expirations:1541421000000" "\xac\xed\x00\x05t\x00,expires:42a435b0-ef5e-4c77-a723-a5ec2013c026"
1536236970.113799 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:expirations:1541421000000" "5184300000"
1536236970.113799 [0 127.0.0.1:55800] "APPEND" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" ""
1536236970.114799 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:expires:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184000000"
1536236970.115799 [0 127.0.0.1:55800] "PEXPIRE" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026" "5184300000"
1536236970.115799 [0 127.0.0.1:55800] "HGETALL" "spring;session:sessions:42a435b0-ef5e-4c77-a723-a5ec2013c026"

Thats a single(!) window refresh with one logged in user.. Is this normal or am I doing something completely wrong? Here's my application.properties:

server.servlet.session.cookie.secure=true
server.servlet.session.cookie.max-age=316224000
server.servlet.session.timeout=5184000

spring.session.store-type=redis
spring.session.redis.flush-mode=ON_SAVE
spring.session.redis.namespace=spring;session

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the browser refresh while running redis-cli MONITOR, then trace the corresponding Spring Session Redis access. The issue provides no source file or test to begin with; done would mean determining whether the repeated session reads and writes are expected or identifying a reproducible behavior to fix.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, redis, spring-boot
Domain
backend, databases
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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