[ARVADOS] updated: 897f8c02f36454c6627d0c5fb78c6adb03137a28

Git user git at public.curoverse.com
Mon Aug 22 16:28:44 EDT 2016


Summary of changes:
 apps/workbench/Gemfile                             |  3 ++
 apps/workbench/Gemfile.lock                        | 10 +++++
 apps/workbench/config/initializers/lograge.rb      | 14 ++++++
 sdk/cwl/arvados_cwl/__init__.py                    | 50 ++++++++++++++++++----
 sdk/cwl/test_with_arvbox.sh                        |  4 +-
 services/api/Gemfile                               |  2 +
 services/api/Gemfile.lock                          | 10 +++++
 .../app/controllers/arvados/v1/jobs_controller.rb  | 15 ++++---
 services/api/config/initializers/load_config.rb    |  2 +-
 services/api/config/initializers/lograge.rb        | 14 ++++++
 ...0819195725_populate_script_parameters_digest.rb |  2 +-
 11 files changed, 107 insertions(+), 19 deletions(-)
 create mode 100644 apps/workbench/config/initializers/lograge.rb
 create mode 100644 services/api/config/initializers/lograge.rb

  discards  a3e6fef2360a470ec33e9792ffdc7dc66d491cb8 (commit)
  discards  051a3252f53a564ccac8d764cb0cff65b1987f77 (commit)
  discards  4a553d66354973620ec2f0970b028ca669448a4b (commit)
  discards  08344809b1887eb7c53e5bdff6171b4c731e5c72 (commit)
       via  897f8c02f36454c6627d0c5fb78c6adb03137a28 (commit)
       via  5c30ff39945f72a633db91b52ba881ac5b02f762 (commit)
       via  282d1464bdc2584d69a2a7734106acc67d6a16e6 (commit)
       via  bfccffd3ca2ea0ee4c129f52f8a1907c973f3951 (commit)
       via  321b2b5486a7e64527eae9718c54425de9285d7c (commit)
       via  a786d20e2ac2dbc5fd78a6100b23e391ddb3ce32 (commit)
       via  69e7b5b364a3e4708325ec214d8d3117095491fd (commit)
       via  4c47283466981a99d27467c086d49a2235f5d0c2 (commit)
       via  9d3c5bef462c95d52ff61693cce49d435461367f (commit)
       via  4b7c0f2aa4da6fdb25419a24d1a7f5b57ab35bfd (commit)
       via  1356cd61457b8a48ed879b97c5cd14eb4ccf0f29 (commit)
       via  6b2ee0dd59e39307649b72940824ceafada35fac (commit)
       via  7daef1e224ee6fb8b03cd7b71773c5381c07324e (commit)
       via  e0fc29c78d959d19c3d63d3bfb204b1c444518bd (commit)

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commit 897f8c02f36454c6627d0c5fb78c6adb03137a28
Author: Tom Clegg <tom at curoverse.com>
Date:   Mon Aug 22 16:25:14 2016 -0400

    9773: If previous jobs disagree about outputs, but a new job is
    already queued/running, reuse the new job (as we did before 9773).

diff --git a/services/api/app/controllers/arvados/v1/jobs_controller.rb b/services/api/app/controllers/arvados/v1/jobs_controller.rb
index cadc824..0c68dc2 100644
--- a/services/api/app/controllers/arvados/v1/jobs_controller.rb
+++ b/services/api/app/controllers/arvados/v1/jobs_controller.rb
@@ -90,12 +90,15 @@ class Arvados::V1::JobsController < ApplicationController
         next
       end
 
-      if @object
+      if @object == false
+        # We have already decided not to reuse any completed job
+        next
+      elsif @object
         if @object.output != j.output
-          # If two matching jobs produced different outputs, just run
-          # a new job instead of choosing one arbitrarily.
-          @object = nil
-          return super
+          # If two matching jobs produced different outputs, run a new
+          # job (or use one that's already running/queued) instead of
+          # choosing one arbitrarily.
+          @object = false
         end
         # ...and that's the only thing we need to do once we've chosen
         # an @object to reuse.

commit 5c30ff39945f72a633db91b52ba881ac5b02f762
Author: Tom Clegg <tom at curoverse.com>
Date:   Sat Aug 20 18:20:29 2016 -0400

    9773: Exclude script_parameters_digest from searchable columns -- it is not even visible to clients.

diff --git a/services/api/app/models/job.rb b/services/api/app/models/job.rb
index 4b9b687..0aaa0bd 100644
--- a/services/api/app/models/job.rb
+++ b/services/api/app/models/job.rb
@@ -110,6 +110,10 @@ class Job < ArvadosModel
     self.script_parameters_digest = self.class.sorted_hash_digest(script_parameters)
   end
 
+  def self.searchable_columns operator
+    super - ["script_parameters_digest"]
+  end
+
   protected
 
   def self.sorted_hash_digest h

commit 282d1464bdc2584d69a2a7734106acc67d6a16e6
Author: Tom Clegg <tom at curoverse.com>
Date:   Fri Aug 19 17:03:24 2016 -0400

    9773: Use script_parameters_digest in reusable job query.

diff --git a/services/api/app/controllers/arvados/v1/jobs_controller.rb b/services/api/app/controllers/arvados/v1/jobs_controller.rb
index 0478f69..cadc824 100644
--- a/services/api/app/controllers/arvados/v1/jobs_controller.rb
+++ b/services/api/app/controllers/arvados/v1/jobs_controller.rb
@@ -77,7 +77,7 @@ class Arvados::V1::JobsController < ApplicationController
       readable_by(current_user).
       where('state = ? or (owner_uuid = ? and state in (?))',
             Job::Complete, current_user.uuid, [Job::Queued, Job::Running]).
-      where('script_parameters = ?', resource_attrs[:script_parameters].to_yaml).
+      where('script_parameters_digest = ?', Job.sorted_hash_digest(resource_attrs[:script_parameters])).
       where('nondeterministic is distinct from ?', true).
       order('state desc, created_at') # prefer Running jobs over Queued
     apply_filters
diff --git a/services/api/test/functional/arvados/v1/job_reuse_controller_test.rb b/services/api/test/functional/arvados/v1/job_reuse_controller_test.rb
index 64d5591..ab79d7b 100644
--- a/services/api/test/functional/arvados/v1/job_reuse_controller_test.rb
+++ b/services/api/test/functional/arvados/v1/job_reuse_controller_test.rb
@@ -19,8 +19,8 @@ class Arvados::V1::JobReuseControllerTest < ActionController::TestCase
       script_version: "4fe459abe02d9b365932b8f5dc419439ab4e2577",
       repository: "active/foo",
       script_parameters: {
-        input: 'fa7aeb5140e2848d39b416daeef4ffc5+45',
-        an_integer: '1'
+        an_integer: '1',
+        input: 'fa7aeb5140e2848d39b416daeef4ffc5+45'
       }
     }
     assert_response :success

commit bfccffd3ca2ea0ee4c129f52f8a1907c973f3951
Author: Tom Clegg <tom at curoverse.com>
Date:   Fri Aug 19 17:02:03 2016 -0400

    9773: Add script_parameters_digest column to support faster job reuse.

diff --git a/services/api/app/models/job.rb b/services/api/app/models/job.rb
index 0ed5353..4b9b687 100644
--- a/services/api/app/models/job.rb
+++ b/services/api/app/models/job.rb
@@ -11,6 +11,7 @@ class Job < ArvadosModel
   after_commit :trigger_crunch_dispatch_if_cancelled, :on => :update
   before_validation :set_priority
   before_validation :update_state_from_old_state_attrs
+  before_validation :update_script_parameters_digest
   validate :ensure_script_version_is_commit
   validate :find_docker_image_locator
   validate :find_arvados_sdk_version
@@ -105,8 +106,23 @@ class Job < ArvadosModel
     end
   end
 
+  def update_script_parameters_digest
+    self.script_parameters_digest = self.class.sorted_hash_digest(script_parameters)
+  end
+
   protected
 
+  def self.sorted_hash_digest h
+    Digest::MD5.hexdigest(Oj.dump(deep_sort_hash(h)))
+  end
+
+  def self.deep_sort_hash h
+    return h unless h.is_a? Hash
+    h.sort.collect do |k, v|
+      [k, deep_sort_hash(v)]
+    end.to_h
+  end
+
   def foreign_key_attributes
     super + %w(output log)
   end
diff --git a/services/api/db/migrate/20160819195557_add_script_parameters_digest_to_jobs.rb b/services/api/db/migrate/20160819195557_add_script_parameters_digest_to_jobs.rb
new file mode 100644
index 0000000..8ed3cfe
--- /dev/null
+++ b/services/api/db/migrate/20160819195557_add_script_parameters_digest_to_jobs.rb
@@ -0,0 +1,6 @@
+class AddScriptParametersDigestToJobs < ActiveRecord::Migration
+  def change
+    add_column :jobs, :script_parameters_digest, :string
+    add_index :jobs, :script_parameters_digest
+  end
+end
diff --git a/services/api/db/migrate/20160819195725_populate_script_parameters_digest.rb b/services/api/db/migrate/20160819195725_populate_script_parameters_digest.rb
new file mode 100644
index 0000000..9f6c3ee
--- /dev/null
+++ b/services/api/db/migrate/20160819195725_populate_script_parameters_digest.rb
@@ -0,0 +1,21 @@
+class PopulateScriptParametersDigest < ActiveRecord::Migration
+  def up
+    done = false
+    while !done
+      done = true
+      Job.
+        where('script_parameters_digest is null').
+        select([:id, :script_parameters, :script_parameters_digest]).
+        limit(200).
+        each do |j|
+        done = false
+        Job.
+          where('id=? or script_parameters=?', j.id, j.script_parameters.to_yaml).
+          update_all(script_parameters_digest: j.update_script_parameters_digest)
+      end
+    end
+  end
+
+  def down
+  end
+end
diff --git a/services/api/db/structure.sql b/services/api/db/structure.sql
index 1d7a2c6..bda4e5d 100644
--- a/services/api/db/structure.sql
+++ b/services/api/db/structure.sql
@@ -539,7 +539,8 @@ CREATE TABLE jobs (
     description character varying(524288),
     state character varying(255),
     arvados_sdk_version character varying(255),
-    components text
+    components text,
+    script_parameters_digest character varying(255)
 );
 
 
@@ -1853,6 +1854,13 @@ CREATE INDEX index_jobs_on_script ON jobs USING btree (script);
 
 
 --
+-- Name: index_jobs_on_script_parameters_digest; Type: INDEX; Schema: public; Owner: -; Tablespace: 
+--
+
+CREATE INDEX index_jobs_on_script_parameters_digest ON jobs USING btree (script_parameters_digest);
+
+
+--
 -- Name: index_jobs_on_started_at; Type: INDEX; Schema: public; Owner: -; Tablespace: 
 --
 
@@ -2674,4 +2682,8 @@ INSERT INTO schema_migrations (version) VALUES ('20160509143250');
 
 INSERT INTO schema_migrations (version) VALUES ('20160808151459');
 
-INSERT INTO schema_migrations (version) VALUES ('20160808151559');
\ No newline at end of file
+INSERT INTO schema_migrations (version) VALUES ('20160808151559');
+
+INSERT INTO schema_migrations (version) VALUES ('20160819195557');
+
+INSERT INTO schema_migrations (version) VALUES ('20160819195725');
\ No newline at end of file
diff --git a/services/api/test/fixtures/jobs.yml b/services/api/test/fixtures/jobs.yml
index 95cb967..584cc23 100644
--- a/services/api/test/fixtures/jobs.yml
+++ b/services/api/test/fixtures/jobs.yml
@@ -23,6 +23,7 @@ running:
     done: 1
   runtime_constraints: {}
   state: Running
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 running_cancelled:
   uuid: zzzzz-8i9sb-4cf0nhn6xte809j
@@ -49,6 +50,7 @@ running_cancelled:
     done: 1
   runtime_constraints: {}
   state: Cancelled
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 uses_nonexistent_script_version:
   uuid: zzzzz-8i9sb-7m339pu0x9mla88
@@ -75,6 +77,7 @@ uses_nonexistent_script_version:
     done: 1
   runtime_constraints: {}
   state: Complete
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 foobar:
   uuid: zzzzz-8i9sb-aceg2bnq7jt7kon
@@ -103,6 +106,7 @@ foobar:
     done: 1
   runtime_constraints: {}
   state: Complete
+  script_parameters_digest: 03a43a7d84f7fb022467b876c2950acd
 
 barbaz:
   uuid: zzzzz-8i9sb-cjs4pklxxjykyuq
@@ -131,6 +135,7 @@ barbaz:
     done: 1
   runtime_constraints: {}
   state: Complete
+  script_parameters_digest: c3d19d3ec50ac0914baa56b149640f73
 
 runningbarbaz:
   uuid: zzzzz-8i9sb-cjs4pklxxjykyuj
@@ -159,6 +164,7 @@ runningbarbaz:
     done: 0
   runtime_constraints: {}
   state: Running
+  script_parameters_digest: c3d19d3ec50ac0914baa56b149640f73
 
 previous_job_run:
   uuid: zzzzz-8i9sb-cjs4pklxxjykqqq
@@ -175,6 +181,7 @@ previous_job_run:
   log: d41d8cd98f00b204e9800998ecf8427e+0
   output: ea10d51bcf88862dbcc36eb292017dfd+45
   state: Complete
+  script_parameters_digest: a5f03bbfb8ba88a2efe4a7852671605b
 
 previous_ancient_job_run:
   uuid: zzzzz-8i9sb-ahd7cie8jah9qui
@@ -191,6 +198,7 @@ previous_ancient_job_run:
   log: d41d8cd98f00b204e9800998ecf8427e+0
   output: ea10d51bcf88862dbcc36eb292017dfd+45
   state: Complete
+  script_parameters_digest: 174dd339d44f2b259fadbab7ebdb8df9
 
 previous_docker_job_run:
   uuid: zzzzz-8i9sb-k6emstgk4kw4yhi
@@ -208,6 +216,7 @@ previous_docker_job_run:
   output: ea10d51bcf88862dbcc36eb292017dfd+45
   docker_image_locator: fa3c1a9cb6783f85f2ecda037e07b8c3+167
   state: Complete
+  script_parameters_digest: a5f03bbfb8ba88a2efe4a7852671605b
 
 previous_ancient_docker_image_job_run:
   uuid: zzzzz-8i9sb-t3b460aolxxuldl
@@ -225,6 +234,7 @@ previous_ancient_docker_image_job_run:
   output: ea10d51bcf88862dbcc36eb292017dfd+45
   docker_image_locator: b519d9cb706a29fc7ea24dbea2f05851+93
   state: Complete
+  script_parameters_digest: 174dd339d44f2b259fadbab7ebdb8df9
 
 previous_job_run_with_arvados_sdk_version:
   uuid: zzzzz-8i9sb-eoo0321or2dw2jg
@@ -244,6 +254,7 @@ previous_job_run_with_arvados_sdk_version:
   success: true
   output: ea10d51bcf88862dbcc36eb292017dfd+45
   state: Complete
+  script_parameters_digest: a5f03bbfb8ba88a2efe4a7852671605b
 
 previous_job_run_no_output:
   uuid: zzzzz-8i9sb-cjs4pklxxjykppp
@@ -258,6 +269,7 @@ previous_job_run_no_output:
   success: true
   output: ~
   state: Complete
+  script_parameters_digest: 174dd339d44f2b259fadbab7ebdb8df9
 
 previous_job_run_superseded_by_hash_branch:
   # This supplied_script_version is a branch name with later commits.
@@ -272,6 +284,7 @@ previous_job_run_superseded_by_hash_branch:
   success: true
   output: d41d8cd98f00b204e9800998ecf8427e+0
   state: Complete
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 nondeterminisic_job_run:
   uuid: zzzzz-8i9sb-cjs4pklxxjykyyy
@@ -286,6 +299,7 @@ nondeterminisic_job_run:
   success: true
   nondeterministic: true
   state: Complete
+  script_parameters_digest: a5f03bbfb8ba88a2efe4a7852671605b
 
 nearly_finished_job:
   uuid: zzzzz-8i9sb-2gx6rz0pjl033w3
@@ -307,6 +321,7 @@ nearly_finished_job:
     done: 0
   runtime_constraints: {}
   state: Complete
+  script_parameters_digest: 7ea26d58a79b7f5db9f90fb1e33d3006
 
 queued:
   uuid: zzzzz-8i9sb-grx15v5mjnsyxk7
@@ -329,6 +344,7 @@ queued:
   tasks_summary: {}
   runtime_constraints: {}
   state: Queued
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 # A job with a log collection that can be parsed by the log viewer.
 job_with_real_log:
@@ -338,6 +354,7 @@ job_with_real_log:
   log: 0b9a7787660e1fce4a93f33e01376ba6+81
   script_version: 7def43a4d3f20789dda4700f703b5514cc3ed250
   state: Complete
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 cancelled:
   uuid: zzzzz-8i9sb-4cf0abc123e809j
@@ -362,6 +379,7 @@ cancelled:
     done: 1
   runtime_constraints: {}
   state: Cancelled
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 job_in_subproject:
   uuid: zzzzz-8i9sb-subprojectjob01
@@ -372,6 +390,7 @@ job_in_subproject:
   script: hash
   script_version: 4fe459abe02d9b365932b8f5dc419439ab4e2577
   state: Complete
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 running_will_be_completed:
   uuid: zzzzz-8i9sb-rshmckwoma9pjh8
@@ -396,6 +415,7 @@ running_will_be_completed:
     done: 1
   runtime_constraints: {}
   state: Running
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 graph_stage1:
   uuid: zzzzz-8i9sb-graphstage10000
@@ -405,6 +425,7 @@ graph_stage1:
   script_version: 4fe459abe02d9b365932b8f5dc419439ab4e2577
   state: Complete
   output: fa7aeb5140e2848d39b416daeef4ffc5+45
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
 
 graph_stage2:
   uuid: zzzzz-8i9sb-graphstage20000
@@ -417,6 +438,7 @@ graph_stage2:
     input: fa7aeb5140e2848d39b416daeef4ffc5+45
     input2: "stuff"
   output: 65b17c95fdbc9800fc48acda4e9dcd0b+93
+  script_parameters_digest: 4900033ec5cfaf8a63566f3664aeaa70
 
 graph_stage3:
   uuid: zzzzz-8i9sb-graphstage30000
@@ -429,6 +451,7 @@ graph_stage3:
     input: fa7aeb5140e2848d39b416daeef4ffc5+45
     input2: "stuff2"
   output: ea10d51bcf88862dbcc36eb292017dfd+45
+  script_parameters_digest: 02a085407e751d00b5dc88f1bd5e8247
 
 job_with_latest_version:
   uuid: zzzzz-8i9sb-nj8ioxnrvjtyk2b
@@ -458,6 +481,7 @@ job_with_latest_version:
     done: 1
   runtime_constraints: {}
   state: Complete
+  script_parameters_digest: 03a43a7d84f7fb022467b876c2950acd
 
 running_job_in_publicly_accessible_project:
   uuid: zzzzz-8i9sb-n7omg50bvt0m1nf
@@ -470,6 +494,7 @@ running_job_in_publicly_accessible_project:
   script_parameters:
     input: fa7aeb5140e2848d39b416daeef4ffc5+45
     input2: "stuff2"
+  script_parameters_digest: 02a085407e751d00b5dc88f1bd5e8247
 
 completed_job_in_publicly_accessible_project:
   uuid: zzzzz-8i9sb-jyq01m7in1jlofj
@@ -484,6 +509,7 @@ completed_job_in_publicly_accessible_project:
     input2: "stuff2"
   log: zzzzz-4zz18-4en62shvi99lxd4
   output: b519d9cb706a29fc7ea24dbea2f05851+93
+  script_parameters_digest: 02a085407e751d00b5dc88f1bd5e8247
 
 job_in_publicly_accessible_project_but_other_objects_elsewhere:
   uuid: zzzzz-8i9sb-jyq01muyhgr4ofj
@@ -498,6 +524,7 @@ job_in_publicly_accessible_project_but_other_objects_elsewhere:
     input2: "stuff2"
   log: zzzzz-4zz18-fy296fx3hot09f7
   output: zzzzz-4zz18-bv31uwvy3neko21
+  script_parameters_digest: 02a085407e751d00b5dc88f1bd5e8247
 
 running_job_with_components:
   uuid: zzzzz-8i9sb-with2components
@@ -527,3 +554,4 @@ running_job_with_components:
   components:
     component1: zzzzz-8i9sb-jyq01m7in1jlofj
     component2: zzzzz-d1hrv-partdonepipelin
+  script_parameters_digest: 99914b932bd37a50b983c5e7c90ae93b
diff --git a/services/api/test/unit/job_test.rb b/services/api/test/unit/job_test.rb
index 832338a..1bc8035 100644
--- a/services/api/test/unit/job_test.rb
+++ b/services/api/test/unit/job_test.rb
@@ -440,4 +440,20 @@ class JobTest < ActiveSupport::TestCase
     assert_equal('077ba2ad3ea24a929091a9e6ce545c93199b8e57',
                  internal_tag(j.uuid))
   end
+
+  test 'script_parameters_digest is independent of key order' do
+    j1 = Job.new(job_attrs(script_parameters: {'a' => 'a', 'ddee' => {'d' => 'd', 'e' => 'e'}}))
+    j2 = Job.new(job_attrs(script_parameters: {'ddee' => {'e' => 'e', 'd' => 'd'}, 'a' => 'a'}))
+    assert j1.valid?
+    assert j2.valid?
+    assert_equal(j1.script_parameters_digest, j2.script_parameters_digest)
+  end
+
+  test 'job fixtures have correct script_parameters_digest' do
+    Job.all.each do |j|
+      d = j.script_parameters_digest
+      assert_equal(j.update_script_parameters_digest, d,
+                   "wrong script_parameters_digest for #{j.uuid}")
+    end
+  end
 end

commit 321b2b5486a7e64527eae9718c54425de9285d7c
Author: Tom Clegg <tom at curoverse.com>
Date:   Fri Aug 19 15:00:09 2016 -0400

    9773: Fix up find-or-create-job code.
    
    * Reduce pyramid of conditions
    
    * Ask the database to filter script_parameters, instead of doing that in Ruby
    
    * Ditto job state
    
    * Check "output is readable?" only once, not once per candidate job
    
    * If two matching jobs have different outputs, avoid reusing either of them,
      even if one of the outputs is not readable by current_user.

diff --git a/services/api/app/controllers/arvados/v1/jobs_controller.rb b/services/api/app/controllers/arvados/v1/jobs_controller.rb
index 6796338..0478f69 100644
--- a/services/api/app/controllers/arvados/v1/jobs_controller.rb
+++ b/services/api/app/controllers/arvados/v1/jobs_controller.rb
@@ -28,83 +28,93 @@ class Arvados::V1::JobsController < ApplicationController
       params[:find_or_create] = !resource_attrs.delete(:no_reuse)
     end
 
-    if params[:find_or_create]
-      return if false.equal?(load_filters_param)
-      if @filters.empty?  # Translate older creation parameters into filters.
-        @filters =
-          [["repository", "=", resource_attrs[:repository]],
-           ["script", "=", resource_attrs[:script]],
-           ["script_version", "not in git", params[:exclude_script_versions]],
-          ].reject { |filter| filter.last.nil? or filter.last.empty? }
-        if !params[:minimum_script_version].blank?
-          @filters << ["script_version", "in git",
-                       params[:minimum_script_version]]
-        else
-          add_default_git_filter("script_version", resource_attrs[:repository],
-                                 resource_attrs[:script_version])
-        end
-        if image_search = resource_attrs[:runtime_constraints].andand["docker_image"]
-          if image_tag = resource_attrs[:runtime_constraints]["docker_image_tag"]
-            image_search += ":#{image_tag}"
-          end
-          image_locator = Collection.
-            for_latest_docker_image(image_search).andand.portable_data_hash
-        else
-          image_locator = nil
-        end
-        @filters << ["docker_image_locator", "=", image_locator]
-        if sdk_version = resource_attrs[:runtime_constraints].andand["arvados_sdk_version"]
-          add_default_git_filter("arvados_sdk_version", "arvados", sdk_version)
-        end
-        begin
-          load_job_specific_filters
-        rescue ArgumentError => error
-          return send_error(error.message)
+    return super if !params[:find_or_create]
+    return if !load_filters_param
+
+    if @filters.empty?  # Translate older creation parameters into filters.
+      @filters =
+        [["repository", "=", resource_attrs[:repository]],
+         ["script", "=", resource_attrs[:script]],
+         ["script_version", "not in git", params[:exclude_script_versions]],
+        ].reject { |filter| filter.last.nil? or filter.last.empty? }
+      if !params[:minimum_script_version].blank?
+        @filters << ["script_version", "in git",
+                     params[:minimum_script_version]]
+      else
+        add_default_git_filter("script_version", resource_attrs[:repository],
+                               resource_attrs[:script_version])
+      end
+      if image_search = resource_attrs[:runtime_constraints].andand["docker_image"]
+        if image_tag = resource_attrs[:runtime_constraints]["docker_image_tag"]
+          image_search += ":#{image_tag}"
         end
+        image_locator = Collection.
+          for_latest_docker_image(image_search).andand.portable_data_hash
+      else
+        image_locator = nil
+      end
+      @filters << ["docker_image_locator", "=", image_locator]
+      if sdk_version = resource_attrs[:runtime_constraints].andand["arvados_sdk_version"]
+        add_default_git_filter("arvados_sdk_version", "arvados", sdk_version)
+      end
+      begin
+        load_job_specific_filters
+      rescue ArgumentError => error
+        return send_error(error.message)
+      end
+    end
+
+    # Check specified filters for some reasonableness.
+    filter_names = @filters.map { |f| f.first }.uniq
+    ["repository", "script"].each do |req_filter|
+      if not filter_names.include?(req_filter)
+        return send_error("#{req_filter} filter required")
       end
+    end
 
-      # Check specified filters for some reasonableness.
-      filter_names = @filters.map { |f| f.first }.uniq
-      ["repository", "script"].each do |req_filter|
-        if not filter_names.include?(req_filter)
-          return send_error("#{req_filter} filter required")
-        end
+    # Search for a reusable Job, and return it if found.
+    @objects = Job.
+      readable_by(current_user).
+      where('state = ? or (owner_uuid = ? and state in (?))',
+            Job::Complete, current_user.uuid, [Job::Queued, Job::Running]).
+      where('script_parameters = ?', resource_attrs[:script_parameters].to_yaml).
+      where('nondeterministic is distinct from ?', true).
+      order('state desc, created_at') # prefer Running jobs over Queued
+    apply_filters
+    @object = nil
+    incomplete_job = nil
+    @objects.each do |j|
+      if j.state != Job::Complete
+        # We'll use this if we don't find a job that has completed
+        incomplete_job ||= j
+        next
       end
 
-      # Search for a reusable Job, and return it if found.
-      @objects = Job.readable_by(current_user)
-      apply_filters
-      @object = nil
-      incomplete_job = nil
-      @objects.each do |j|
-        if j.nondeterministic != true and
-            ["Queued", "Running", "Complete"].include?(j.state) and
-            j.script_parameters == resource_attrs[:script_parameters]
-          if j.state != "Complete" && j.owner_uuid == current_user.uuid
-            # We'll use this if we don't find a job that has completed
-            incomplete_job ||= j
-          else
-            if Collection.readable_by(current_user).find_by_portable_data_hash(j.output)
-              # Record the first job in the list
-              if !@object
-                @object = j
-              end
-              # Ensure that all candidate jobs actually did produce the same output
-              if @object.output != j.output
-                @object = nil
-                break
-              end
-            end
-          end
-        end
-        @object ||= incomplete_job
-        if @object
-          return show
+      if @object
+        if @object.output != j.output
+          # If two matching jobs produced different outputs, just run
+          # a new job instead of choosing one arbitrarily.
+          @object = nil
+          return super
         end
+        # ...and that's the only thing we need to do once we've chosen
+        # an @object to reuse.
+      elsif !Collection.readable_by(current_user).find_by_portable_data_hash(j.output)
+        # As soon as the output we will end up returning (if any) is
+        # decided, check whether it will be visible to the user; if
+        # not, any further investigation of reusable jobs is futile.
+        return super
+      else
+        @object = j
       end
     end
 
-    super
+    @object ||= incomplete_job
+    if @object
+      show
+    else
+      super
+    end
   end
 
   def cancel
@@ -171,7 +181,7 @@ class Arvados::V1::JobsController < ApplicationController
     load_limit_offset_order_params
     load_where_param
     @where.merge!({state: Job::Queued})
-    return if false.equal?(load_filters_param)
+    return if !load_filters_param
     find_objects_for_index
     index
   end
@@ -293,6 +303,8 @@ class Arvados::V1::JobsController < ApplicationController
     rescue ArgumentError => error
       send_error(error.message)
       false
+    else
+      true
     end
   end
 end

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