14 Commits (79d8922b9c4df8a89efe72afb25daabd90dadf2c)

Author	SHA1	Message	Date
Robert Fratto	8c4eb428c3	chore(dataobj): Download pages in 16MB batches (#16689)	10 months ago
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>	10 months ago
benclive	7f32de6cf2	chore(dataobj): Refactor processor & builder to separate concerns (#16055)	11 months ago
Robert Fratto	5929b05a64	chore(dataobj): deduplicate decoder code across bucket and io.ReadSeeker (#15945)	11 months ago
Robert Fratto	93cee63f59	chore(dataobj): add compression ratio and final object size distributions (#15848)	11 months ago
Robert Fratto	948f5c5f3e	chore(dataobj): Reintroduce sorting of the logs section (#15906)	11 months ago
Robert Fratto	64665c4595	chore(dataobj): promote metadata types to hold uint64 instead of uint32 (#15850)	11 months ago
Robert Fratto	2a60011b13	chore(dataobj): reduce total allocations while encoding (#15846)	11 months ago
Robert Fratto	093e36af58	chore(dataobj): instrument data objects (#15803)	12 months ago
Robert Fratto	127ad5326f	chore(dataobj): support for building and flushing data objects (#15780)	12 months ago
Robert Fratto	83a506954c	chore(dataobj): fix bug where instances of *bytes.Buffer are incorrectly shared (#15776)	12 months ago
Robert Fratto	aec8e968da	chore(dataobj): track non-NULL values in pages/columns (#15758)	12 months ago
Robert Fratto	bcec63d9c2	chore(dataobj): logs section metadata and encoding/decoding (#15720)	12 months ago
Robert Fratto	896e138425	chore(dataobj): data object encoding and decoding (#15676)	12 months ago