Add config.yml.MIDRES for older Cassandra versions

patch by Ekaterina Dimitrova; review by Andres de la Pena for CASSANDRA-16804

.circleci/config-2_1.yml.mid_res.patch

@@ -0,0 +1,75 @@
+diff --git a/.circleci/config-2_1.yml b/.circleci/config-2_1.yml
+index 03e4ae9e8f..cf2b758187 100644
+--- a/.circleci/config-2_1.yml
++++ b/.circleci/config-2_1.yml
+@@ -93,24 +93,40 @@ j8_par_executor: &j8_par_executor
+   executor:
+     name: java8-executor
+     #exec_resource_class: xlarge
+-  parallelism: 4
++    exec_resource_class: medium
++  parallelism: 25
+ 
+ j8_small_par_executor: &j8_small_par_executor
+   executor:
+     name: java8-executor
+     #exec_resource_class: xlarge
+-  parallelism: 1
++    exec_resource_class: large
++  parallelism: 10
+ 
+ j8_medium_par_executor: &j8_medium_par_executor
+   executor:
+     name: java8-executor
+     #exec_resource_class: xlarge
+-  parallelism: 1
++    exec_resource_class: large
++  parallelism: 4
++
++j8_large_par_executor: &j8_large_par_executor
++  executor:
++    name: java8-executor
++    exec_resource_class: large
++  parallelism: 50
++
++j8_very_large_par_executor: &j8_very_large_par_executor
++  executor:
++    name: java8-executor
++    exec_resource_class: xlarge
++  parallelism: 100
+ 
+ j8_seq_executor: &j8_seq_executor
+   executor:
+     name: java8-executor
+     #exec_resource_class: xlarge
++    exec_resource_class: medium
+   parallelism: 1 # sequential, single container tests: no parallelism benefits
+ 
+ with_dtests_jobs: &with_dtest_jobs
+@@ -308,7 +324,7 @@ jobs:
+           target: testclasslist-compression
+ 
+   j8_dtests-with-vnodes:
+-    <<: *j8_par_executor
++    <<: *j8_large_par_executor
+     steps:
+       - attach_workspace:
+           at: /home/cassandra
+@@ -322,7 +338,7 @@ jobs:
+           pytest_extra_args: '--use-vnodes --num-tokens=32 --skip-resource-intensive-tests'
+ 
+   j8_dtests-no-vnodes:
+-    <<: *j8_par_executor
++    <<: *j8_large_par_executor
+     steps:
+       - attach_workspace:
+           at: /home/cassandra
+@@ -336,7 +352,7 @@ jobs:
+           pytest_extra_args: '--skip-resource-intensive-tests'
+ 
+   j8_upgradetests-no-vnodes:
+-    <<: *j8_par_executor
++    <<: *j8_very_large_par_executor
+     steps:
+       - attach_workspace:
+           at: /home/cassandra

.circleci/generate.sh

@@ -24,6 +24,12 @@ circleci config process $BASEDIR/config-2_1.yml > $BASEDIR/config.yml.LOWRES.tmp
 cat $BASEDIR/license.yml $BASEDIR/config.yml.LOWRES.tmp > $BASEDIR/config.yml.LOWRES
 rm $BASEDIR/config.yml.LOWRES.tmp
 
+# setup midres
+patch -o $BASEDIR/config-2_1.yml.MIDRES $BASEDIR/config-2_1.yml $BASEDIR/config-2_1.yml.mid_res.patch
+circleci config process $BASEDIR/config-2_1.yml.MIDRES > $BASEDIR/config.yml.MIDRES.tmp
+cat $BASEDIR/license.yml $BASEDIR/config.yml.MIDRES.tmp > $BASEDIR/config.yml.MIDRES
+rm $BASEDIR/config-2_1.yml.MIDRES $BASEDIR/config.yml.MIDRES.tmp
+
 # setup highres
 patch -o $BASEDIR/config-2_1.yml.HIGHRES $BASEDIR/config-2_1.yml $BASEDIR/config-2_1.yml.high_res.patch
 circleci config process $BASEDIR/config-2_1.yml.HIGHRES > $BASEDIR/config.yml.HIGHRES.tmp

.circleci/readme.md

@@ -26,14 +26,17 @@ between them by copying the correct file to config.yml and committing the result
 
 `cp .circleci/config.yml.HIGHRES .circleci/config.yml`
 
+config.yml.LOWRES is the default config. MIDRES and HIGHRES are custom configs for those who
+have access to premium CircleCI resources.
+
 Make sure you never edit the config.yml manually.
 
 ## Updating the config master
-To update the config (other than just swapping high/low resources) you need to install
+To update the config (other than just swapping high/mid/low resources) you need to install
 the [CircleCI CLI](https://circleci.com/docs/2.0/local-cli/#install).
 
-The directory contains `config-2_1.yml` which is then converted to the actual HIGH/LOW
-resource files. There is a script called `generate.sh` which creates the LOWRES and
+The directory contains `config-2_1.yml` which is then converted to the actual HIGH/MID/LOW
+resource files. There is a script called `generate.sh` which creates the LOWRES, MIDRES, and
 HIGHRES files, read below for details how to do it manually;
 
 1. make your edits to config-2_1.yml - let it stay at lowres settings
@@ -53,4 +56,11 @@ HIGHRES files, read below for details how to do it manually;
 1. remove the temporary patched HIGHRES file: `rm config-2_1.yml.HIGHRES`
 1. add the Apache license header to the newly created HIGHRES file:
    `cat license.yml config.yml.HIGHRES > config.yml.HIGHRES.new && mv config.yml.HIGHRES.new config.yml.HIGHRES`
+1. repeat the last steps to generate the MIDRES file:
+   ```
+   patch -o config-2_1.yml.MIDRES config-2_1.yml config-2_1.yml.mid_res.patch
+   circleci config process config-2_1.yml.MIDRES > config.yml.MIDRES
+   rm config-2_1.yml.MIDRES
+   cat license.yml config.yml.MIDRES > config.yml.MIDRES.new && mv config.yml.MIDRES.new config.yml.MIDRES
+   ```