Specified key was too long; max key length is 767 bytes

create index dep_ver_commit_rev_idx on DEPLOYMENT_VERSION_COMMIT (COMMIT_REVISION)
2015-07-14 00:42:46,355 ERROR [localhost-startStop-1] [SchemaUpdate] Unsuccessful: create index dep_ver_commit_rev_idx on DEPLOYMENT_VERSION_COMMIT (COMMIT_REVISION)
2015-07-14 00:42:46,355 ERROR [localhost-startStop-1] [SchemaUpdate] Specified key was too long; max key length is 767 bytes
2015-07-14 00:42:46,355 INFO [localhost-startStop-1] [SchemaUpdate] schema update complete

Workaround

1. Stop Bamboo
2. Run the SQL against the Bamboo database

   ALTER TABLE REPOSITORY_CHANGESET MODIFY CHANGESET_ID VARCHAR(255);
   ALTER TABLE USER_COMMIT MODIFY COMMIT_REVISION VARCHAR(255);
   ALTER TABLE DEPLOYMENT_VERSION_COMMIT MODIFY COMMIT_REVISION VARCHAR(255);
   

3. Start Bamboo