Fix the WritePartitioner to exactly match cascading #1805
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We were failing the laws previously, sometimes taking more than n + 1 steps where cascading took n. By improving the logic, we fix those bugs and reach actually exactly matching cascading. This should allow use batching to bypass any case of cascading taking too long to plan.
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@non helped me get the algorithms right here. Thanks! |
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fixes #1804 |
ianoc
reviewed
Feb 16, 2018
| @@ -215,80 +215,163 @@ object WritePartitioner { | |||
| } | |||
| } | |||
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| /** | |||
| * If cascading would conside the current pipe as a Logical reduce | |||
ianoc
reviewed
Feb 16, 2018
| @@ -80,7 +81,7 @@ class WritePartitionerTest extends FunSuite with PropertyChecks { | |||
| } | |||
| } | |||
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| forAll(TypedPipeGen.genWithFakeSources)(afterPartitioningEachStepIsSize1(_)) | |||
| //forAll(TypedPipeGen.genWithFakeSources)(afterPartitioningEachStepIsSize1(_)) | |||
ianoc
reviewed
Feb 16, 2018
| @@ -127,6 +207,6 @@ class WritePartitionerTest extends FunSuite with PropertyChecks { | |||
| .waitFor(Config.empty, Local(true)).get.isEmpty) | |||
| } | |||
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| forAll(TypedPipeGen.genWithIterableSources)(partitioningDoesNotChange(_)) | |||
| //forAll(TypedPipeGen.genWithIterableSources)(partitioningDoesNotChange(_)) | |||
ianoc
reviewed
Feb 16, 2018
| /** | ||
| * This is a lattice value that tracks | ||
| * what we have seen below a given TypedPipe as | ||
| * we recurse up. |
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This is super neet/nice, could you expand the comments here -- don't think i'd have followed other than I know what your aiming to do.
(Motivation/why we are tracking/what we are aiming to do with it)
ianoc
reviewed
Feb 16, 2018
| rec(src) | ||
| case (Fork(src@SourcePipe(_)), rec) => | ||
| case ((cp: CounterPipe[a], bs), rec) => | ||
| mat.map(rec((cp.pipe, bs | Write)))(CounterPipe(_: TypedPipe[(a, Iterable[((String, String), Long)])])) |
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why is a counter pipe | Write ?
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it doesn't need to be, Write is the bottom, so x | Write = x.
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lgtm |
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We were failing the laws previously, sometimes taking
more than n + 1 steps where cascading took n. By
improving the logic, we fix those bugs and reach
actually exactly matching cascading.
This should allow use batching to bypass any
case of cascading taking too long to plan.