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do not delete expired keys in KEYS command

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This commit is contained in:
zhaozhao.zz 2018-10-19 18:00:57 +08:00
parent 3f7bc5a5d2
commit 7ab9cba59b
1 changed files with 34 additions and 27 deletions
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47
src/db.c
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@ -38,6 +38,8 @@
* C-level DB API
*----------------------------------------------------------------------------*/
int keyIsExpired(redisDb *db, robj *key);
/* Update LFU when an object is accessed.
* Firstly, decrement the counter if the decrement time is reached.
* Then logarithmically increment the counter, and update the access time. */
@ -543,7 +545,7 @@ void keysCommand(client *c) {
if (allkeys || stringmatchlen(pattern,plen,key,sdslen(key),0)) {
keyobj = createStringObject(key,sdslen(key));
if (expireIfNeeded(c->db,keyobj) == 0) {
if (!keyIsExpired(c->db,keyobj)) {
addReplyBulk(c,keyobj);
numkeys++;
}
@ -1120,6 +1122,25 @@ void propagateExpire(redisDb *db, robj *key, int lazy) {
decrRefCount(argv[1]);
}
/* Check if the key is expired. */
int keyIsExpired(redisDb *db, robj *key) {
mstime_t when = getExpire(db,key);
if (when < 0) return 0; /* No expire for this key */
/* Don't expire anything while loading. It will be done later. */
if (server.loading) return 0;
/* If we are in the context of a Lua script, we pretend that time is
* blocked to when the Lua script started. This way a key can expire
* only the first time it is accessed and not in the middle of the
* script execution, making propagation to slaves / AOF consistent.
* See issue #1525 on Github for more information. */
mstime_t now = server.lua_caller ? server.lua_time_start : mstime();
return now > when;
}
/* This function is called when we are going to perform some operation
* in a given key, but such key may be already logically expired even if
* it still exists in the database. The main way this function is called
@ -1140,21 +1161,9 @@ void propagateExpire(redisDb *db, robj *key, int lazy) {
* The return value of the function is 0 if the key is still valid,
* otherwise the function returns 1 if the key is expired. */
int expireIfNeeded(redisDb *db, robj *key) {
mstime_t when = getExpire(db,key);
mstime_t now;
if (when < 0) return 0; /* No expire for this key */
/* Don't expire anything while loading. It will be done later. */
if (server.loading) return 0;
/* If we are in the context of a Lua script, we pretend that time is
* blocked to when the Lua script started. This way a key can expire
* only the first time it is accessed and not in the middle of the
* script execution, making propagation to slaves / AOF consistent.
* See issue #1525 on Github for more information. */
now = server.lua_caller ? server.lua_time_start : mstime();
if (!keyIsExpired(db,key)) {
return 0;
} else if (server.masterhost != NULL) {
/* If we are running in the context of a slave, return ASAP:
* the slave key expiration is controlled by the master that will
* send us synthesized DEL operations for expired keys.
@ -1162,10 +1171,8 @@ int expireIfNeeded(redisDb *db, robj *key) {
* Still we try to return the right information to the caller,
* that is, 0 if we think the key should be still valid, 1 if
* we think the key is expired at this time. */
if (server.masterhost != NULL) return now > when;
/* Return when this key has not expired */
if (now <= when) return 0;
return 1;
}
/* Delete the key */
server.stat_expiredkeys++;