Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.
Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.
The changes we applied mechanically with a script, except to
licenses/README.md.
Closes#9937
"
The range_tombstone_list provides an abstraction to work with
sorted list of range tombstones with methods to add/retrive
them. However, there's a tombstones() method that just returns
modifiable reference to the used collection (boost::intrusive_set)
which makes it hard to track the exact usage of it.
This set encapsulates the collaction of range tombstones inside
the mentioned ..._list class.
tests: unit(dev)
"
* 'br-range-tombstone-encapsulate-collection' of https://github.com/xemul/scylla:
range_tombstone_list: Do not expose internal collection
range_tombstone_list: Introduce and use pop-and-lock helper
range_tombstone_list: Introduce and use pop_as<>()
flat_mutation_reader: Use range_tombstone_list begin/end API
repair: Mark some partition_hasher methods noexcept
hashers: Mark hash updates noexcept
With the new hashing routine, null values are taken into account
when computing row digest. Previous behavior had a regression
which stopped computing the hash after the first null value
is encountered, but the original behavior was also prone
to errors - e.g. row [1, NULL, 2] was not distinguishable
from [1, 2, NULL], because their hashes were identical.
This hashing is not yet active - it will only be used after
the next commit introduces a proper cluster feature for it.
All those methods end up with library calls, whose code
is not marked noexcept, but is such according to code
itself or docs.
The primary goal is to make some repair partition_hasher
methods noexcept (next patch).
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
The xxhash library has been packaged by Fedora, so we can use it
instead of carrying the submodule. This reduces allows us to
receive updates as the OS packages are updated. Build time will
not be reduced since it is a header-only library.
xxhash preserves the hash results across versions so rolling
upgrades will still work.
The frozen toolchain is updated with the new package.
Tests: unit (dev)
In release mode gcc9 has a false positive warning about out of bound
access in xxhash implementation:
./xxHash/xxhash.c:799:27: error: array subscript -3 is outside array bounds of ‘long unsigned int [1]’ [-Werror=array-bounds]
This is solved by disabling -Warray-bounds in the xxhash code.
This patch introduces xx_hasher, a class conforming to the Hasher
concept, which will be used to calculate the data digest in subsequent
patches. It is expected to be an order of magnitude faster than md5.
We use the 64 bit variant of the algorithm, the 128 bit one still
being under development.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
