Turns out that when the fork child crashes, the crash log was deleting
the pidfile from the disk (although the parent is still running.
Now we set the pidfile of the fork process to NULL so the fork process
will never deletes it.
(cherry picked from commit 4192faa9821aa4c19be3bd245d8366a1bc1b0332)
instead of asking for the extra new space it wanted, it asked to grow the
string by the size it already has too.
i.e. a string of 1000 bytes, needing to grow by 10 bytes, would have been
asking for an **additional** 1010 bytes.
(cherry picked from commit f2bde2268a5420ed2d481fc0141cb73de0b1f200)
This is a recent problem, introduced by 9b2a426 (redis 6.0)
The implications are:
The sole difference between LookupKeyRead and LookupKeyWrite is for command
executed on a replica, which are not received from its master client. (for the master,
and for the master client on the replica, these two functions behave the same)!
Since SORT is a write command, this bug only implicates a writable-replica.
And these are its implications:
- SORT STORE will behave as it did before the above mentioned commit (like before
redis 6.0). on a writable-replica an already logically expired the key would have
appeared missing. (store dest key would be deleted, instead of being populated
with the data from the already logically expired key)
- SORT (the non store variant, which in theory could have been executed on
read-only-replica if it weren't for the write flag), will (in redis 6.0) have a new bug
and return the data from the already logically expired key instead of empty response.
(cherry picked from commit 6230ba081109beaf367d8fe3552bc848dc3896f4)
Turns out the RDB checksum in Redis 6.0 on bigendian is broken.
It always returned 0, so the RDB files are generated as if checksum is
disabled, and will be loaded ok on littleendian, and on bigendian.
But it'll not be able to load RDB files generated on littleendian or older versions.
Similarly DUMP and RESTORE will work on the same version (0==0),
but will be unable to exchange dump payloads with littleendian or old versions.
(cherry picked from commit a67621f495762dfe09f9a7e28d12b0729a7b0d12)
getRDB is "designed" to work in two modes: one for redis-cli --rdb and
one for redis-cli --cluster backup.
in the later case it uses the hiredis connection from the cluster nodes
and it used to free it without nullifying the context, so a later
attempt to free the context would crash.
I suppose the reason it seems to want to free the hiredis context ASAP
is that it wants to disconnect the replica link, so that replication
buffers will not be accumulated.
(cherry picked from commit 93b8b139305a99678528fabc9bf9cc5e9133b5a4)
When a Lua script returns a map to redis (a feature which was added in
redis 6 together with RESP3), it would have returned the value first and
the key second.
If the client was using RESP2, it was getting them out of order, and if
the client was in RESP3, it was getting a map of value => key.
This was happening regardless of the Lua script using redis.setresp(3)
or not.
This also affects a case where the script was returning a map which it got
from from redis by doing something like: redis.setresp(3); return redis.call()
This fix is a breaking change for redis 6.0 users who happened to rely
on the wrong order (either ones that used redis.setresp(3), or ones that
returned a map explicitly).
This commit also includes other two changes in the tests:
1. The test suite now handles RESP3 maps as dicts rather than nested
lists
2. Remove some redundant (duplicate) tests from tracking.tcl
(cherry picked from commit bcde1d978d74f84cb4a66dc8bbd746842217f8b2)
The crash log attempts to print the current client info, and when it
does that it attempts to check if the first argument happens to be a key
but it did so for commands with no arguments too, which caused the crash
log to crash half way and not reach its end.
(cherry picked from commit 318d58192289a471987aa12ca913a3569d4f54d0)
Normally IO threads should simply read data from the socket into the
buffer and attempt to parse it.
If a protocol error is detected, a reply is generated which may result
with installing a write handler which is not thread safe. This fix
delays that until the client is processed back in the main thread.
Fixes#8220
(cherry picked from commit 53f926dd9068a62795abc2e01dabac5be0ccbada)
Older arm64 Linux kernels have a bug that could lead to data corruption during
background save under the following scenario:
1) jemalloc uses MADV_FREE on a page,
2) jemalloc reuses and writes the page,
3) Redis forks the background save process, and
4) Linux performs page reclamation.
Under these conditions, Linux will reclaim the page wrongfully and the
background save process will read zeros when it tries to read the page.
The bug has been fixed in Linux with commit:
ff1712f953e27f0b0718762ec17d0adb15c9fd0b ("arm64: pgtable: Ensure dirty bit is
preserved across pte_wrprotect()")
This Commit adds an ignore-warnings config, when not found, redis will
print a warning and exit on startup (default behavior).
Co-authored-by: Oran Agra <oran@redislabs.com>
(cherry picked from commit 75bbf56d37d1134cc9c4f36900a4a623604776a5)
in 6.0 this warning is ignored by default in order to avoid adding
regression, specifically for deployments that don't need persistence or
replication
In response to large client query buffer optimization introduced in 1898e6c. The calculation of the amount of
remaining bytes we need to write to the query buffer was calculated wrong, as a result we are unnecessarily
growing the client query buffer by sdslen(c->querybuf) always. This fix corrects that behavior.
Please note the previous behavior prior to the before-mentioned change was correctly calculating the remaining
additional bytes, and this change makes that calculate to be consistent.
Useful context, the argument of size `ll` starts at qb_pos (which is now the beginning of the sds), but much of it
may have already been read from the socket, so we only need to grow the sds for the remainder of it.
(cherry picked from commit b8c98337cd8f90064085a7af4b416f6fb3e80e1c)
Module blocked clients cache the response in a temporary client,
the reply list in this client would be affected by the recent fix
in #7202, but when the reply is later copied into the real client,
it would have bypassed all the checks for output buffer limit, which
would have resulted in both: responding with a partial response to
the client, and also not disconnecting it at all.
(cherry picked from commit 11e0c4739b40c23a70aff5287e67e8ef6418bb2a)
Makes spt_init more careful with assumptions about what memory regions
may be overwritten. It will now only consider a contiguous block of argv
and envp elements and mind any gaps.
(cherry picked from commit 9f272197ea0d8e59f565782a6a1b420b9b94266d)
Seems to have gone unnoticed for a long time, because at least with
glibc it will only be triggered if setenv() was called before spt_init,
which Redis doesn't.
Fixes#8064.
(cherry picked from commit 87f59674b4f24fab3e98d3cb029ad85be5e68266)
When replica diskless-load type is swapdb in cluster mode, we didn't backup
keys to slots map, so we will lose keys to slots map if fail to sync.
Now we backup keys to slots map at first, and restore it properly when fail.
This commit includes a refactory/cleanup of the backups mechanism (moving it to db.c and re-structuring it a bit).
Co-authored-by: Oran Agra <oran@redislabs.com>
(cherry picked from commit 10712afaf3e7f2ea859622fa5b27c96ee8f478c5)
On FLUSHDB or full sync, reset old average TTL stat.
This Stat is incrementally collected by the master over time when it searches for expired keys.
(cherry picked from commit b6916ca91c623a892f61cc9d1958c19490eb73ae)
This is hopefully usually harmles.
The server.ready_keys will usually be empty so the code after releasing
the GIL will soon be done.
The only case where it'll actually process things is when a module
releases a client (or module) blocked on a key, by triggering this NOT
from within a command (e.g. a timer event).
This bug was introduced in redis 6.0.9, see #7903
(cherry picked from commit f5604de4c8962db75a770dafff3b0ac830b6c4d1)
Fix: When oom-score-adj-values is provided in the config file after
oom-score-adj yes, it'll take an immediate action, before
readOOMScoreAdj was acquired, resulting in an error (out of range score
due to uninitialized value. delay the reaction the real call is made by
main().
Since the values are clamped to -1000..1000, and they're
applied as an offset from the value at startup (which may be -1000), we
need to allow the offsets to reach to +2000 so that a value of +1000 is
achievable in case the value at startup was -1000.
Adding an option for absolute values rather than relative ones.
(cherry picked from commit f08fd95c6686467ecd46116dab150d47563aed1c)
The bug was introduced by #5021 which only attempted avoid EXIST on an
already expired key from returning 1 on a replica.
Before that commit, dbExists was used instead of
lookupKeyRead (which had an undesired effect to "touch" the LRU/LFU)
Other than that, this commit fixes OBJECT to also come empty handed on
expired keys in replica.
And DEBUG DIGEST-VALUE to behave like DEBUG OBJECT (get the data from
the key regardless of it's expired state)
(cherry picked from commit 168dcb549c3d5253fc69d6150ce98f8eb9ca0c99)
In redisFork(), we don't set child pid, so updateDictResizePolicy()
doesn't take effect, that isn't friendly for copy-on-write.
The bug was introduced this in redis 6.0: e70fbad
(cherry picked from commit 16e3af9d23bb4791a7571f889aad8f2c85546521)
