these metrics become negative when RSS is smaller than the used_memory.
This can easily happen when the program allocated a lot of memory and haven't
written to it yet, in which case the kernel doesn't allocate any pages to the process
If we encounter an unsupported protocol in the "bind" list, don't
ipso-facto consider it a fatal error. We continue to abort startup if
there are no listening sockets at all.
This ensures that the lack of IPv6 support does not prevent Redis from
starting on Debian where we try to bind to the ::1 interface by default
(via "bind 127.0.0.1 ::1"). A machine with IPv6 disabled (such as some
container systems) would simply fail to start Redis after the initiall
call to apt(8).
This is similar to the case for where "bind" is not specified:
https://github.com/antirez/redis/issues/3894
... and was based on the corresponding PR:
https://github.com/antirez/redis/pull/4108
... but also adds EADDRNOTAVAIL to the list of errors to catch which I
believe is missing from there.
This issue was raised in Debian as both <https://bugs.debian.org/900284>
& <https://bugs.debian.org/914354>.
This really helps spot it in the logs, otherwise it does not look like a
warning/error. For example:
Creating Server TCP listening socket ::1:6379: bind: Cannot assign requested address
... is not nearly as clear as:
Could not create server TCP listening listening socket ::1:6379: bind: Cannot assign requested address
server.hz was uninitialized between initServerConfig and initServer.
this can lead to someone (e.g. queued modules) doing createObject,
and accessing an uninitialized variable, that can potentially be 0,
and lead to a crash.
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.
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
Processing command from the master while the slave is in busy state is
not correct, however we cannot, also, just reply -BUSY to the
replication stream commands from the master. The correct solution is to
stop processing data from the master, but just accumulate the stream
into the buffers and resume the processing later.
Related to #5297.
Note: this breaks backward compatibility with Redis 4, since now slaves
by default are exact copies of masters and do not try to evict keys
independently.
User: "is there a reason why redis server logs are missing the year in
the "date time"?"
Me: "I guess I did not imagine it would be stable enough to run for
several years".
