Like Prometheus, but for logs.

prometheushacktoberfestgrafanacloudnativeloggingloki

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Robert Fratto f6091a67d1 chore(engine): move to toggleable section prefetching (#19142) ... dataset.readerDownloader was originally introduced in #16429, an attempt to balance peak memory usage of reading a section with read times by downloading a configurable size of pages in advance. In practice, each roundtrip to object storage adds too much of a latency hit, and we've started to set the cache limit high enough to ensure that each reader only needs a single prefetch. Given what we've found, it no longer makes sense to control peak memory usage via the prefetch size. Other options, such as downloading directly to disk, may be explored in the future. In the meantime, this PR removes the ability to specify a cache size. All non-pruned pages will be bulk requested using the range reader (#19067) on the first read call. Pages which have left the potential read window will continue to be eagerly removed for garbage collection. However, we don't want to prefetch when the dataset is entirely in memory, which is the case when the logs section builder is performing k-way merge over in-memory sections. To lower the memory usage of builders, prefetching is configurable. For this initial PR, prefetching is only disabled for the logs section builder; all other reads force prefetching. Signed-off-by: Robert Fratto <robertfratto@gmail.com>		4 months ago
..
builder.go	feat: add tenant to section builders (#18864)	5 months ago
builder_test.go	chore(dataobj): add ability to buffer pending sections to disk (#18780)	5 months ago
iter.go	chore(engine): move to toggleable section prefetching (#19142)	4 months ago
metrics.go	chore(dataobj)!: introduce new centralized dataset encoding format (#18871)	5 months ago
predicate.go	chore(engine): use columnar logs.Reader for DataObjScan (#18577)	6 months ago
reader.go	chore(engine): move to toggleable section prefetching (#19142)	4 months ago
reader_test.go	chore(engine): use columnar logs.Reader for DataObjScan (#18577)	6 months ago
row_predicate.go	…
row_predicate_test.go	…
row_reader.go	chore(engine): move to toggleable section prefetching (#19142)	4 months ago
row_reader_test.go	chore(dataobj): add ability to buffer pending sections to disk (#18780)	5 months ago
stats.go	chore(dataobj)!: introduce new centralized dataset encoding format (#18871)	5 months ago
streams.go	chore(dataobj)!: introduce new centralized dataset encoding format (#18871)	5 months ago