Like Prometheus, but for logs.

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Robert Fratto 7f0dc01e21 chore(dataobj): introduce more efficient dataset reading (#16429) ... This commit introduces a new API, dataset.Reader, which scans through values in datasets more efficiently than dataset.Iter. As a result, dataset.Iter has been removed in favour of the new Reader. dataset.Reader is more efficient than dataset.Iter because: - It avoids using iter.Pull; the number of values flowing through coroutines added a significant amount of CPU overhead. - It supports efficient uses of predicates, where non-predicate columns are only loaded after finding matching rows from predicate columns; this avoids loading unnecessary pages. - It adds initial support for bulk page downloading, so that we need fewer roundtrips to object storage when iterating over a dataset. (This is not fully implemented yet; see below). - Early performance benchmarks see a ~3.4x speed improvement over reading 7GB of uncompressed logs, going from 192 MB/s (with dataset.Iter) to 652 MB/s (with dataset.Reader). This commit is truly massive, and to avoid it getting any larger, I'm leaving some follow up work to additional commits: - Updating dataobj.LogsReader and dataobj.StreamsReader to use the new API. - Adding support for downloading pages in batches; dataset.Reader will request multiple pages at once, but our decoder still unwraps that into several GET requests to object storage. Signed-off-by: Robert Fratto <robertfratto@gmail.com> Co-authored-by: Cyril Tovena <cyril.tovena@gmail.com>		11 months ago
..
iter.go	chore(dataobj): introduce more efficient dataset reading (#16429)	11 months ago
logs.go	chore(dataobj): Reintroduce sorting of the logs section (#15906)	1 year ago
logs_test.go	chore(dataobj): deduplicate decoder code across bucket and io.ReadSeeker (#15945)	1 year ago
metrics.go	chore(dataobj): instrument data objects (#15803)	1 year ago
table.go	feat(dataobj): cardinality estimation (#16233)	11 months ago
table_build.go	chore(dataobj): Reintroduce sorting of the logs section (#15906)	1 year ago
table_merge.go	chore(dataobj): introduce more efficient dataset reading (#16429)	11 months ago
table_test.go	chore(dataobj): introduce more efficient dataset reading (#16429)	11 months ago