Why are there so many redis requests happening?

[tbrannt]

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

[dreis2211]

Any feedback on this? @vpavic Maybe?

[rwinch]

@dreis2211 Spring Session is used at scale at many large companies. Before you start to get worried about performance, I'd test it.

Is your application making requests for resources like images, css, javascript, etc? If so, this is likely the reason you are seeing additional requests being made. Again, this is unlikely a problem as Spring Session is used at scale at many large companies. If you run some tests and find problems, please let us know.

[dreis2211]

@rwinch Thanks for taking the time, but the application posted above is not mine. I see similar high amounts of redis commands in my application though. Roughly 9-10 per request, which unfortunately seems like the normal amount of redis commands per request.

The surprising bit here is that requests are also producing HGETALL calls that are configured with http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS); or are permitted to be called via permitAll() as soon as any session cookie seems to be present in the request - even though it doesn't need to be used.

[tbrannt]

@rwinch yes there are also images, css, javascript, etc. requested. Redis might be fast but I still found this too much. Wrote my own redis-session implementation now that suits my needs

[rwinch]

@dreis2211 Thanks for the response. You are right. Unfortunately, Spring Security isn't lazy about accessing the HttpSession in servlet apps (it is for WebFlux), so you are right that permitAll will access the HttpSession. This has been in the back of my mind for some time, so I created #6125

@tbrannt If you have css, images, javascript, etc. Then each of those requests are going to hit Redis if/when the session is requested.

[haodi]

I also encountered this problem when I upgraded spring-session-data-redis:1.3.0.RELEASE from production environment to spring-session-data-redis:2.2.0.RELEASE, I found from the monitoring system that the traffic in the direction of the NIC entrance has increased, after I passed the redis-cli monitor, I found every request There are 4 more HGETALL requests than 1.3.0.RELEASE. It is found through the DEBUG code that org.springframework.session.web.http.SessionRepositoryFilter.SessionRepositoryRequestWrapper # clearRequestedSessionCache is executed each time.

The 6 calls are as follows：

1. org.springframework.web.servlet.DispatcherServlet#doService
2. com.netflix.zuul.http.ZuulServlet#postRoute
3. org.springframework.session.web.http.SessionRepositoryFilter.SessionRepositoryRequestWrapper#commitSession
4. org.springframework.web.servlet.support.SessionFlashMapManager#retrieveFlashMaps
5. org.springframework.session.web.http.SessionRepositoryFilter.SessionRepositoryResponseWrapper#onResponseCommitted
6. org.springframework.session.web.http.SessionRepositoryFilter#doFilterInternal

private void clearRequestedSessionCache() {
  this.requestedSessionCached = false;
  this.requestedSession = null;
  this.requestedSessionId = null;
}

private S getRequestedSession() {
  if (!this.requestedSessionCached) {
    List<String> sessionIds = SessionRepositoryFilter.this.httpSessionIdResolver.resolveSessionIds(this);
    for (String sessionId : sessionIds) {
      if (this.requestedSessionId == null) {
        this.requestedSessionId = sessionId;
      }
      S session = SessionRepositoryFilter.this.sessionRepository.findById(sessionId);
      if (session != null) {
        this.requestedSession = session;
        this.requestedSessionId = sessionId;
        break;
      }
    }
    this.requestedSessionCached = true;
  }
  return this.requestedSession;
}

SPRING-SESSION-DATA-REDIS:1.3.0.RELEASE

1582429914.959099 [0 127.0.0.1:65127] "HGETALL" "SPRING:SESSION:SESSIONS:A547A718-5D75-4DCA-B45E-D54CD1C2E357"
1582429914.984189 [0 127.0.0.1:65127] "HMSET" "SPRING:SESSION:SESSIONS:A547A718-5D75-4DCA-B45E-D54CD1C2E357" "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\X01PP,GP"
1582429914.984739 [0 127.0.0.1:65127] "SREM" "SPRING:SESSION:EXPIRATIONS:1582433460000" "\XAC\XED\X00\X05T\X00,EXPIRES:A547A718-5D75-4DCA-B45E-D54CD1C2E357"
1582429914.985050 [0 127.0.0.1:65127] "SADD" "SPRING:SESSION:EXPIRATIONS:1582433520000" "\XAC\XED\X00\X05T\X00,EXPIRES:A547A718-5D75-4DCA-B45E-D54CD1C2E357"
1582429914.985335 [0 127.0.0.1:65127] "PEXPIRE" "SPRING:SESSION:EXPIRATIONS:1582433520000" "3900000"
1582429914.985558 [0 127.0.0.1:65127] "APPEND" "SPRING:SESSION:SESSIONS:EXPIRES:A547A718-5D75-4DCA-B45E-D54CD1C2E357" ""
1582429914.985994 [0 127.0.0.1:65127] "PEXPIRE" "SPRING:SESSION:SESSIONS:EXPIRES:A547A718-5D75-4DCA-B45E-D54CD1C2E357" "3600000"
1582429914.986253 [0 127.0.0.1:65127] "PEXPIRE" "SPRING:SESSION:SESSIONS:A547A718-5D75-4DCA-B45E-D54CD1C2E357" "3900000"
1582429915.189499 [0 127.0.0.1:65127] "HGETALL" "SPRING:SESSION:SESSIONS:A547A718-5D75-4DCA-B45E-D54CD1C2E357"
1582429915.192570 [0 127.0.0.1:65127] "HMSET" "SPRING:SESSION:SESSIONS:A547A718-5D75-4DCA-B45E-D54CD1C2E357" "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\X01PP,H6"
1582429915.193138 [0 127.0.0.1:65127] "SADD" "SPRING:SESSION:EXPIRATIONS:1582433520000" "\XAC\XED\X00\X05T\X00,EXPIRES:A547A718-5D75-4DCA-B45E-D54CD1C2E357"
1582429915.193391 [0 127.0.0.1:65127] "PEXPIRE" "SPRING:SESSION:EXPIRATIONS:1582433520000" "3900000"
1582429915.193634 [0 127.0.0.1:65127] "APPEND" "SPRING:SESSION:SESSIONS:EXPIRES:A547A718-5D75-4DCA-B45E-D54CD1C2E357" ""
1582429915.193869 [0 127.0.0.1:65127] "PEXPIRE" "SPRING:SESSION:SESSIONS:EXPIRES:A547A718-5D75-4DCA-B45E-D54CD1C2E357" "3600000"
1582429915.194104 [0 127.0.0.1:65127] "PEXPIRE" "SPRING:SESSION:SESSIONS:A547A718-5D75-4DCA-B45E-D54CD1C2E357" "3900000"

spring-session-data-redis:2.2.0.RELEASE

1582430768.700651 [0 127.0.0.1:49201] "HGETALL" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357"
1582430768.834518 [0 127.0.0.1:49202] "HMSET" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357" "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\x01pp9N="
1582430768.835568 [0 127.0.0.1:49203] "SREM" "spring:session:expirations:1582434360000" "\xac\xed\x00\x05t\x00,expires:a547a718-5d75-4dca-b45e-d54cd1c2e357"
1582430768.836625 [0 127.0.0.1:49204] "SADD" "spring:session:expirations:1582434420000" "\xac\xed\x00\x05t\x00,expires:a547a718-5d75-4dca-b45e-d54cd1c2e357"
1582430768.837531 [0 127.0.0.1:49205] "PEXPIRE" "spring:session:expirations:1582434420000" "3900000"
1582430768.838303 [0 127.0.0.1:49206] "APPEND" "spring:session:sessions:expires:a547a718-5d75-4dca-b45e-d54cd1c2e357" ""
1582430768.839020 [0 127.0.0.1:49207] "PEXPIRE" "spring:session:sessions:expires:a547a718-5d75-4dca-b45e-d54cd1c2e357" "3600000"
1582430768.839737 [0 127.0.0.1:49208] "PEXPIRE" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357" "3900000"
1582430768.840347 [0 127.0.0.1:49209] "HGETALL" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357"
1582430768.841834 [0 127.0.0.1:49210] "HGETALL" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357"
1582430769.014811 [0 127.0.0.1:49211] "HGETALL" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357"
1582430769.018079 [0 127.0.0.1:49212] "HMSET" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357" "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\x01pp9Ow"
1582430769.019115 [0 127.0.0.1:49213] "SADD" "spring:session:expirations:1582434420000" "\xac\xed\x00\x05t\x00,expires:a547a718-5d75-4dca-b45e-d54cd1c2e357"
1582430769.023053 [0 127.0.0.1:49214] "PEXPIRE" "spring:session:expirations:1582434420000" "3900000"
1582430769.025518 [0 127.0.0.1:49215] "APPEND" "spring:session:sessions:expires:a547a718-5d75-4dca-b45e-d54cd1c2e357" ""
1582430769.026861 [0 127.0.0.1:49216] "PEXPIRE" "spring:session:sessions:expires:a547a718-5d75-4dca-b45e-d54cd1c2e357" "3600000"
1582430769.028046 [0 127.0.0.1:49217] "PEXPIRE" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357" "3900000"
1582430769.029600 [0 127.0.0.1:49218] "HGETALL" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357"
1582430769.032417 [0 127.0.0.1:49219] "HGETALL" "spring:session:sessions:a547a718-5d75-4dca-b45e-d54cd1c2e357"

[wnjustdoit]

I got the same problem like @haodi metioned above.
this method in spring-webmvc-5.0.8.RELEASE.jar always is invoked for serveral times:

org.springframework.web.servlet.support.SessionFlashMapManager#retrieveFlashMaps

[wnjustdoit]

Well, I've got an idea about how to reduce the redis session access times to only once for every servlet request. If the redis command of 'hMset' & 'expires' are both invoked at the end of Filter#doFilter before the Spring Session Framework (maybe with the Spring Framework) makes statistics for the http session data, then the redundant costs may reduce much more at some scenarios.
And I also got the answer about the problem methioned above. It is mainly that:
If you use RedirectView (or "redirect:/path_to_some_get_method"), at the same time, you use none-empty RedirectAttributes, then request.getSession(true) will be called. In this situation, session will forcely be created if not exists, and session will be forcely touched if it exists already.
Further more, it is lucky that the Spring Framework's FlashMap Attributes can be Serialized and it is stored in Redis if you use Spring Session Redis.

[vpavic]

To everyone that commented here (or simply looking at this issue): are you aware of the existence of a simpler Redis based session repository implementation i.e. RedisSessionRepository?

It was introduced in Spring Session 2.2 specifically aiming to be a more performant session repository implementation, as long as you don't use the FindByIndexNameSessionRepository and session events.

Here are some relevant resources:

• the original announcement at spring.io (note that at the time of that milestone release it was named SimpleRedisOperationsSessionRepository)
• sample project showcasing the usage
• Improve RedisSessionRepository-based sample configuration #1710