replxx requires each history line to prepended with time line:
### YYYY-MM-DD HH:MM:SS.SSS
select 1
And w/o those service lines it will load all lines from history file as
one history line for suggestion. And if there are lots of lines in file it
will take lots of time (getline() + tons of reallocations).
This is the function that should take into account TLS block, and 1MB is
too high, since it will be used for sigaltstack() on SIGSEGV
v0: copy-paste glibc __pthread_get_minstack()
v2: return static 16K instead of 1MB
- Uses a small assembly file to include binary resources, rather than
objcopy
- Updates `base/common/getResource.cpp` for this new method of inclusion
- Removes linux-only guards in CMake files, as this solution is
cross-platform.
The resulting binary resources are available in the ClickHouse server
binary on Linux, macOS, and illumos platforms. FreeBSD has not been
tested, but will likely work as well.
Some code does not expect from the logger code to throw, and this can
lead to the problems like:
- marking distributed batch as broken (in
StorageDistributedDirectoryMonitor)
- some MergeTree code may also be affected.
So instead of throwing the exception, it will be logged to the stderr
(if it is possible).
Default settings are not very efficient, since they do not even reuse
connections.
And when each query requires connection you can have only ~80 QPS, while
by simply enabling connection reuse (connection_auto_close=false) you
can have ~500 QPS (and by increasing connection_pool_size you can have
better QPS throughput).
So this patch allows to pass through some connection related settings
for the StorageMySQL engine, like:
- connection_pool_size=16
- connection_max_tries=3
- connection_auto_close=true
v2: remove connection_pool_default_size
v3: remove num_tries_on_connection_loss
