Changes ~jobs.error_stack from blob to mediumblob

Author: chrisroat

datajoint/jobs.py

@@ -32,7 +32,7 @@ def __init__(self, conn, database):
         status  :enum('reserved','error','ignore')  # if tuple is missing, the job is available
         key=null  :blob  # structure containing the key
         error_message=""  :varchar({error_message_length})  # error message returned if failed
-        error_stack=null  :blob  # error stack if failed
+        error_stack=null  :mediumblob  # error stack if failed
         user="" :varchar(255) # database user
         host=""  :varchar(255)  # system hostname
         pid=0  :int unsigned  # system process id

tests/test_jobs.py

@@ -122,3 +122,23 @@ def test_long_error_message():
     assert_true(error_message == short_error_message, 'error messages do not agree')
     assert_false(error_message.endswith(TRUNCATION_APPENDIX), 'error message should not be truncated')
     schema.schema.jobs.delete()
+
+
+def test_long_error_stack():
+    # clear out jobs table
+    schema.schema.jobs.delete()
+
+    # create long error stack
+    STACK_SIZE = 89942  # Does not fit into small blob (should be 64k, but found to be higher)
+    long_error_stack = ''.join(random.choice(string.ascii_letters) for _ in range(STACK_SIZE))
+    assert_true(subjects)
+    table_name = 'fake_table'
+
+    key = subjects.fetch('KEY')[0]
+
+    # test long error stack
+    schema.schema.jobs.reserve(table_name, key)
+    schema.schema.jobs.error(table_name, key, 'error message', long_error_stack)
+    error_stack = schema.schema.jobs.fetch1('error_stack')
+    assert_true(error_stack == long_error_stack, 'error stacks do not agree')
+    schema.schema.jobs.delete()