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Ran 30 Nov 2015 08:54PM UTC

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Build # 8110

Build Type

push

travis-ci

Committed by

ericzundel

Commit Message

Update the dependencies returned from ivy to be in a stable (sorted) order.

Reproduces a root cause of slow compiles noticed at Square.

The resolution report from Ivy doesn't return the deps from a target in a stable order. In one case, we get the dependencies of the `jetty-jsp` dep which lists jetty-schema before servlet-api.  In another case it reverses the order of those two deps.

This causes the classpath to be ordered differently when compiling different targets, causing unecessary cache invalidation, and possibly different results when compiling transitive dependencies.  To resolve this, we will sort dependencies alphabetically to insure a stable ordering.

Testing Done:
CI is green at https://travis-ci.org/pantsbuild/pants/builds/93252409

Tried this in our local build. Its an improvement in the number of transitive deps that need to be recompiled when 2 targets share a lot of commone deps.  In one instance, it prevented 67 targets from being recompiled and decreased build time by 4 minutes (was 9 minutes)

Bugs closed: 2607, 2618

Reviewed at https://rbcommons.com/s/twitter/r/3168/

Coverage Stats

Jobs

ID	Job ID	Ran	Coverage
1	8110.1 (CI_FLAGS="-cjlpn 'Various pants self checks'")	30 Nov 2015 08:54PM UTC		Travis Job 8110.1
2	8110.2 (CI_FLAGS="-fkmsrcn -u 0/2 'Unit tests for pants and pants-plugins - shard 1'")	11 Oct 2017 04:29AM UTC	23.09	Travis Job 8110.2
4	8110.4 (CI_FLAGS="-fkmsrcjlp 'Python contrib tests'")	30 Nov 2015 09:07PM UTC		Travis Job 8110.4
5	8110.5 (CI_FLAGS="-fkmsrjlpn -i 0/6 'Python integration tests for pants - shard 1'")	30 Nov 2015 08:55PM UTC		Travis Job 8110.5
6	8110.6 (CI_FLAGS="-fkmsrjlpn -i 1/6 'Python integration tests for pants - shard 2'")	30 Nov 2015 09:00PM UTC		Travis Job 8110.6
7	8110.7 (CI_FLAGS="-fkmsrjlpn -i 2/6 'Python integration tests for pants - shard 3'")	30 Nov 2015 09:06PM UTC		Travis Job 8110.7
8	8110.8 (CI_FLAGS="-fkmsrjlpn -i 3/6 'Python integration tests for pants - shard 4'")	30 Nov 2015 09:05PM UTC		Travis Job 8110.8
9	8110.9 (CI_FLAGS="-fkmsrjlpn -i 4/6 'Python integration tests for pants - shard 5'")	30 Nov 2015 09:06PM UTC		Travis Job 8110.9
10	8110.10 (CI_FLAGS="-fkmsrjlpn -i 5/6 'Python integration tests for pants - shard 6'")	30 Nov 2015 09:18PM UTC		Travis Job 8110.10

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