RocksDB supports injecting a custom logger. By introducing
RocksDBLogForwarder, it is possible to retrieve RocksDB log lines and
log them as TraceEvents.
Note that RocksDB is multi-threaded while FDB is designed to be
single threaded, in the FDB event loop there are certain variables
defined as thread_local. This causes that only FDB main thread could
generate TraceEvent, since information like Machine are only available
in the main thread. The current design is to cache all log lines from
the other threads, and let the main thread report the cached log, when:
* The main thread received log
* Every some time (this should be a Knob but at this stage a magic
number is used for convenience.)
It is possible to parse the log lines into Key/Value pairs for
TraceEvent output, but at this stage only the format string is printed
out. Also, RocksDB may log some errors that are interpreted as SevError,
which will cause simulation failures. To prevent this, the maximum error
level is set to SevWarn, which should be reconsidered carefully.
The code is tested by 1) random simulations to ensure the log lines are
included in the XML files 2) force the simulator uses RocksDB and run a
10k correctness run. Both tests passed.
Both push() and pushAndCommit() now require reference-counted pageData and file->write() is wrapped in uncancellable(holdWhile(pageData, ..)). To support this with no additional overhead, StringBuffer returns a Standalone reference to its contents.
* Replace KeyRange with std::vector<KeyRange> in DataMoveMetaData and
CheckpointMetaData.
* Checked if ranges.empty().
* fmt.
* Resolved some comments.
Co-authored-by: He Liu <heliu@apple.com>
* Proactively clean up idempotency ids for successful commits
This change also includes some minor changes from my branch working on
an idempotency ids cleaner, that I'd like to get merged sooner rather
than later.
- Adding a timestamp to idempotency values
- Making IdempotencyId an actor file
- Adding commit_unknown_result_fatal
- Checking idempotencyIdsExpiredVersion in determineCommitStatus
- Some testing QOL changes
* Factor out decodeIdempotencyKey logic
* Fix formatting
* Update flow/include/flow/error_definitions.h
Co-authored-by: A.J. Beamon <aj.beamon@snowflake.com>
* Use KeyBackedObjectProperty for idempotencyIdsExpiredVersion
* Add IDEMPOTENCY_ID_IN_MEMORY_LIFETIME knob
* Rename ExpireIdempotencyKeyValuePairRequest
Also add a code probe for the case where an ExpireIdempotencyIdRequest is
received before the count is known, and add an assert
* Fix formatting and add TODO for nwijetunga
Co-authored-by: A.J. Beamon <aj.beamon@snowflake.com>
Xiaoxi Wang