xadd with id * generates random stream id
xadd & xtrim with approximate maxlen count may
trim stream randomly
xinfo may get random radix-tree-keys/nodes
xpending may get random idletime
xclaim: master and slave may have different
idletime in stream
Related to #4840.
Note that when we re-enter the event loop with aeProcessEvents() we
don't process timers, nor before/after sleep callbacks, so we should
never end calling freeClientsInAsyncFreeQueue() when re-entering the
loop.
Related to #5201.
I removed the !!! Warning part since compared to the other errors, a
missing EXEC is in theory a normal happening in the AOF file, at least
in theory: may happen in a differnet number of situations, and it's
probably better to don't give the user the feeling that something really
bad happened.
Slaves and rebooting redis may have different radix tree struct,
by different stream* config options. So propagating approximated
MAXLEN to AOF/slaves may lead to date inconsistency.
If we rewrite the MAXLEN argument as zero when no trimming
was performed, date between master and slave and aof will
be inconsistent, because `xtrim maxlen 0` means delete all
entries in stream.
This is useful in order to spot bugs where we fail
at updating the pointer returned by the insertion
function. Normally often the same pointer is returned,
making it harder than needed to spot bugs.
Related to #5210.
There are two problems if we use lastcmd:
1. BRPOPLPUSH cannot be rewrited as RPOPLPUSH in multi/exec
In mulit/exec context, the lastcmd is exec.
2. Redis will crash when execute RPOPLPUSH loading from AOF
In fakeClient, the lastcmd is NULL.
sdsZmallocSize assumes a dynamically allocated SDS. When given a string
object created by createEmbeddedStringObject, it calls zmalloc_size on a
pointer that isn't the one returned by zmalloc
When HAVE_MALLOC_SIZE is false, each call to zrealloc causes used_memory
to increase by PREFIX_SIZE more than it should, due to mis-matched
accounting between the original zmalloc (which includes PREFIX size in
its increment) and zrealloc (which misses it from its decrement).
I've also supplied a command-line test to easily demonstrate the
problem. It's not wired into the test framework, because I don't know
TCL so I'm not sure how to automate it.
