Prepared LIST statements were not calculating metadata in PREPARE path, and sent empty string hash to client causing problematic behaviour where metadat_id was not recalculated correctly.
This patch moves metadata construction into get_result_metadata() for the affected LIST statements and reuse that metadata when building the result set.
This gives PREPARE a stable metadata id for LIST ROLES, LIST USERS, LIST PERMISSIONS and the service-level variants.
This patch also adds a new boost test that verifies that when an EXECUTE request carries an empty result metadata id while the server has a real metadata id for the result set, the response is marked METADATA_CHANGED and includes the full result metadata plus the server metadata id.
This covers the recovery path for clients that send an empty or otherwise unusable metadata id instead of a matching cached one.
In this patch we replace every single use of SCYLLA_ASSERT() in the cql3/
directory by throwing_assert().
The problem with SCYLLA_ASSERT() is that when it fails, it crashes Scylla.
This is almost always a bad idea (see #7871 discussing why), but it's even
riskier in front-end code like cql3/: In front-end code, there is a risk
that due to a bug in our code, a specific user request can cause Scylla
to crash. A malicious user can send this query to all nodes and crash
the entire cluster. When the user is not malicious, it causes a small
problem (a failing request) to become a much worse crash - and worse,
the user has no idea which request is causing this crash and the crash
will repeat if the same request is tried again.
All of this is solved by using the new throwing_assert(), which is the
same as SCYLLA_ASSERT() but throws an exception (using on_internal_error())
instead of crashing. The exception will prevent the code path with the
invalid assumption from continuing, but will result in only the current
user request being aborted, with a clear error message reporting the
internal server error due to an assertion failure.
I reviewed all the changes that I did in this patch to check that (to the
best of my understanding) none of the assertions in cql3/ involve the
sort of serious corruption that might require crashing the Scylla node
entirely.
throwing_assert() also improves logging of assertion failures compared
to the original SCYLLA_ASSERT() - SCYLLA_ASSERT() printed a message to
stderr which in many installations is lost, whereas throwing_assert()
uses Scylla's standard logger, and also includes a backtrace in the
log message.
Fixes#13970 (Exorcise assertions from CQL code paths)
Refs #7871 (Exorcise assertions from Scylla)
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
assert() is traditionally disabled in release builds, but not in
scylladb. This hasn't caused problems so far, but the latest abseil
release includes a commit [1] that causes a 1000 insn/op regression when
NDEBUG is not defined.
Clearly, we must move towards a build system where NDEBUG is defined in
release builds. But we can't just define it blindly without vetting
all the assert() calls, as some were written with the expectation that
they are enabled in release mode.
To solve the conundrum, change all assert() calls to a new SCYLLA_ASSERT()
macro in utils/assert.hh. This macro is always defined and is not conditional
on NDEBUG, so we can later (after vetting Seastar) enable NDEBUG in release
mode.
[1] 66ef711d68Closesscylladb/scylladb#20006
After fcb8d040 ("treewide: use Software Package Data Exchange
(SPDX) license identifiers"), many dual-licensed files were
left with empty comments on top. Remove them to avoid visual
noise.
Closes#10562
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
This moves sstring copies from the callers to the constructor
implementation.
While at it, move the implementation out-of-line.
Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
