When using queries like 'select count(_seriesKey) from bigmeasurement`, we
should iterate over the tsi structures to serve the query instead of loading
all the series into memory up front.
Co-authored-by: Sam Arnold <sarnold@influxdata.com>
* refactor(storage): move type ByTagKey to the only package that uses it
* refactor(tsdb): use types in tsdb/cursors
* refactor(tsdb): remove unused type SeriesIDElems
* refactor(tsdb): inline only use of tsdb.ReadAllSeriesIDIterator
* refactor(tsdb): move series file to its own package
* refactor(storage): remove platform->influxdb aliases
This commit adds the pkg/lifecycle.Resource to help manage opening,
closing, and leasing out references to some resource. A resource
cannot be closed until all acquired references have been released.
If the debug_ref tag is enabled, all resource acquisitions keep
track of the stack trace that created them and have a finalizer
associated with them to print on stderr if they are leaked. It also
registers a handler on SIGUSR2 to dump all of the currently live
resources.
Having resources tracked in a uniform way with a data type allows us
to do more sophisticated tracking with the debug_ref tag, as well.
For example, we could panic the process if a resource cannot be
closed within a certain time frame, or attempt to figure out the
DAG of resource ownership dynamically.
This commit also fixes many issues around resources, correctness
during error scenarios, reporting of errors, idempotency of
close, tracking of memory for some data structures, resource leaks
in tests, and out of order dependency closes in tests.
I did this with a dumb editor macro, so some comments changed too.
Also rename root package from platform to influxdb.
In interest of minimizing risk, anyone importing the root package has
now aliased it to "platform" so that no changes beyond imports were
necessary in those files.
Lastly, replace the old platform module to local path /dev/null so that
nobody can accidentally reintroduce a platform dependency while
migrating platform code to influxdb.
This pulls in the code that allows doing reads with flux into the
platform repo, and removes extra.go.
The reusable portion is under storage/reads, where the concrete
implementation for one of the platform's engines is in
storage/readservice.
In order to make this more reusable, the cursors had to move into
their own package, decoupling it from all of the other code in the
tsdb package. tsdb/cursors is this new package, and type/function
aliases have been added to the tsdb package to point at it.
The models package already is very light on transitive dependencies
and so it was allowed to be depended on in a concrete way in the
cursors package.
Finally, the protobuf definitions for issuing GRPC reads has been
moved into its own package for two reasons:
1. It's a clean separation, and helps keep it that way.
2. Many/most consumers will not be using GRPC. We just
use the datatypes to express the API which helps making
a GRPC server easier.
It is left up to future refactorings (specifically ones that involve
GPRC) to determine if these types should remain, or if there is a
cleaner way.
There's still some dependencies on both github.com/influxdata/influxql
and github.com/influxdata/influxdb/logger that we can hopefully remove
in future refactorings.
Daniel Moran
sans
Stuart Carnie
Jacob Marble
Ben Johnson
Todd Persen
zhulongcheng
Jacob Marble
Jeff Wendling
Mark Rushakoff
Edd Robinson
Mark Rushakoff
Jeff Wendling