test: fix vinyl/deferred_delete failure

The patch fixes the following test failure:

 | --- vinyl/deferred_delete.result        Fri Mar 15 18:17:05 2019
 | +++ vinyl/deferred_delete.reject        Fri Mar 15 18:18:18 2019
 | @@ -577,7 +577,7 @@
 |  ...
 |  sk:stat().rows -- ditto
 |  ---
 | -- 5
 | +- 25
 |  ...
 |  s:drop()
 |  ---

The failure was introduced by commit 6dd0d2f ("vinyl: do not apply
run_count_per_level to the last level"). Due to the commit compaction of
the secondary index may happen before compaction of the primary index,
in which case deferred DELETE statements won't make it to the secondary
index in time against the test expectation. Fix this by making the first
run big enough to prevent major compaction from kicking in.

Follow-up #3657
Closes #4047

(cherry picked from commit 5433435)

test/vinyl/deferred_delete.result

@@ -575,6 +575,14 @@ pk = s:create_index('pk', {run_count_per_level = 10})
 sk = s:create_index('sk', {run_count_per_level = 10, parts = {2, 'unsigned'}, unique = false})
 ---
 ...
+-- Write a run big enough to prevent major compaction from kicking in
+-- (run_count_per_level is ignored on the last level - see gh-3657).
+dummy_rows = 100
+---
+...
+for i = 1001, 1000 + dummy_rows do s:replace{i, i} end
+---
+...
 for i = 1, 10 do s:replace{i, i} end
 ---
 ...
@@ -597,19 +605,19 @@ for i = 2, 10, 2 do s:replace{i, i * 100} end
 box.commit()
 ---
 ...
-sk:select()
+sk:select({1000}, {iterator = 'le'})
 ---
-- - [2, 200]
-  - [4, 400]
-  - [6, 600]
+- - [10, 1000]
   - [8, 800]
-  - [10, 1000]
+  - [6, 600]
+  - [4, 400]
+  - [2, 200]
 ...
-pk:stat().rows -- 10 old REPLACEs + 5 DELETEs + 5 new REPLACEs
+pk:stat().rows - dummy_rows -- 10 old REPLACEs + 5 DELETEs + 5 new REPLACEs
 ---
 - 20
 ...
-sk:stat().rows -- 10 old REPLACEs + 5 new REPLACEs
+sk:stat().rows - dummy_rows -- 10 old REPLACEs + 5 new REPLACEs
 ---
 - 15
 ...
@@ -635,19 +643,19 @@ sk:compact()
 while sk:stat().disk.compaction.count == 0 do fiber.sleep(0.001) end
 ---
 ...
-sk:select()
+sk:select({1000}, {iterator = 'le'})
 ---
-- - [2, 200]
-  - [4, 400]
-  - [6, 600]
+- - [10, 1000]
   - [8, 800]
-  - [10, 1000]
+  - [6, 600]
+  - [4, 400]
+  - [2, 200]
 ...
-pk:stat().rows -- 5 new REPLACEs
+pk:stat().rows - dummy_rows -- 5 new REPLACEs
 ---
 - 5
 ...
-sk:stat().rows -- ditto
+sk:stat().rows - dummy_rows -- ditto
 ---
 - 5
 ...

test/vinyl/deferred_delete.test.lua

@@ -202,6 +202,12 @@ s:drop()
 s = box.schema.space.create('test', {engine = 'vinyl'})
 pk = s:create_index('pk', {run_count_per_level = 10})
 sk = s:create_index('sk', {run_count_per_level = 10, parts = {2, 'unsigned'}, unique = false})
+
+-- Write a run big enough to prevent major compaction from kicking in
+-- (run_count_per_level is ignored on the last level - see gh-3657).
+dummy_rows = 100
+for i = 1001, 1000 + dummy_rows do s:replace{i, i} end
+
 for i = 1, 10 do s:replace{i, i} end
 box.snapshot()
 
@@ -211,10 +217,10 @@ for i = 1, 10, 2 do s:delete{i} end
 for i = 2, 10, 2 do s:replace{i, i * 100} end
 box.commit()
 
-sk:select()
+sk:select({1000}, {iterator = 'le'})
 
-pk:stat().rows -- 10 old REPLACEs + 5 DELETEs + 5 new REPLACEs
-sk:stat().rows -- 10 old REPLACEs + 5 new REPLACEs
+pk:stat().rows - dummy_rows -- 10 old REPLACEs + 5 DELETEs + 5 new REPLACEs
+sk:stat().rows - dummy_rows -- 10 old REPLACEs + 5 new REPLACEs
 
 -- Compact the primary index to generate deferred DELETEs.
 box.snapshot()
@@ -226,10 +232,10 @@ box.snapshot()
 sk:compact()
 while sk:stat().disk.compaction.count == 0 do fiber.sleep(0.001) end
 
-sk:select()
+sk:select({1000}, {iterator = 'le'})
 
-pk:stat().rows -- 5 new REPLACEs
-sk:stat().rows -- ditto
+pk:stat().rows - dummy_rows -- 5 new REPLACEs
+sk:stat().rows - dummy_rows -- ditto
 
 s:drop()