[GitHub] eiri opened a new issue #1282: Test suite mem3_shards occasionally failing.

[GitBox <gi...@apache.org>]

eiri opened a new issue #1282: Test suite mem3_shards occasionally failing.
URL: https://github.com/apache/couchdb/issues/1282
 
 
   Once in a while mem3_sync_event_listener test failing
   
   ## Expected Behavior
   
   The mem3 tests should always pass.
   
   ## Current Behavior
   
   Occasionally the tests are failing with 
   
   ```
    mem3_shards:679: t_cache_insert_ignores_stale_update_and_kills_worker...ok
     Test mem3_shards changes listener
       mem3_shards:754: should_kill_changes_listener_on_shutdown...*failed*
   in function mem3_shards:'-should_kill_changes_listener_on_shutdown/1-fun-1-'/1 (src/mem3_shards.erl, line 757)
   in call from mem3_shards:'-should_kill_changes_listener_on_shutdown/1-fun-4-'/1 (src/mem3_shards.erl, line 757)
   **error:{assertion_failed,[{module,mem3_shards},
                      {line,757},
                      {expression,"is_process_alive ( ChangesPid )"},
                      {expected,true},
                      {value,false}]}
   
   
       [done in 0.003 s]
     [done in 1.471 s]
   ```
   
   It seems there are a race in mem3_sync_event_listener's setup/teardown, though it's not easy to consistently reproduce.
   
   ## Possible Solution
   
   We need to find where the race is happening and switch that place to sync.
   

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