Python apache是否支持Sybase作为元数据数据库？

将

sql\u alchemy\u conn

设置为

sybase

连接字符串后，

initdb

命令失败，出现以下错误。是因为apache不支持Sybase作为元数据数据库吗

airflow initdb
...
...
{db.py:222} INFO - Creating tables
Traceback (most recent call last):
  File "/opt/anaconda/bin/airflow", line 15, in <module>
    args.func(args)
  File "/opt/anaconda/lib/python3.4/site-packages/airflow/bin/cli.py", line 524, in initdb
    db_utils.initdb()
  File "/opt/anaconda/lib/python3.4/site-packages/airflow/utils/db.py", line 106, in initdb
    upgradedb()
  File "/opt/anaconda/lib/python3.4/site-packages/airflow/utils/db.py", line 230, in upgradedb
    command.upgrade(config, 'heads')
  File "/opt/anaconda/lib/python3.4/site-packages/alembic/command.py", line 174, in upgrade
    script.run_env()
  File "/opt/anaconda/lib/python3.4/site-packages/alembic/script/base.py", line 416, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/opt/anaconda/lib/python3.4/site-packages/alembic/util/pyfiles.py", line 93, in load_python_file
    module = load_module_py(module_id, path)
  File "/opt/anaconda/lib/python3.4/site-packages/alembic/util/compat.py", line 79, in load_module_py
    mod = imp.load_source(module_id, path, fp)
  File "/opt/anaconda/lib/python3.4/site-packages/airflow/migrations/env.py", line 74, in <module>
    run_migrations_online()
  File "/opt/anaconda/lib/python3.4/site-packages/airflow/migrations/env.py", line 65, in run_migrations_online
    compare_type=COMPARE_TYPE,
  File "<string>", line 8, in configure
  File "/opt/anaconda/lib/python3.4/site-packages/alembic/runtime/environment.py", line 773, in configure
    opts=opts
  File "/opt/anaconda/lib/python3.4/site-packages/alembic/runtime/migration.py", line 159, in configure
    return MigrationContext(dialect, connection, opts, environment_context)
  File "/opt/anaconda/lib/python3.4/site-packages/alembic/runtime/migration.py", line 103, in __init__
    self.impl = ddl.DefaultImpl.get_by_dialect(dialect)(
  File "/opt/anaconda/lib/python3.4/site-packages/alembic/ddl/impl.py", line 65, in get_by_dialect
    return _impls[dialect.name]
KeyError: 'sybase'

initdb
...
...
{db.py:222}INFO-创建表
回溯（最近一次呼叫最后一次）：
文件“/opt/anaconda/bin/afflow”，第15行，in
args.func（args）
initdb中的文件“/opt/anaconda/lib/python3.4/site packages/afflow/bin/cli.py”，第524行
db_utils.initdb（）
initdb中的文件“/opt/anaconda/lib/python3.4/site packages/afflow/utils/db.py”，第106行
升级数据库（）
文件“/opt/anaconda/lib/python3.4/site packages/afflow/utils/db.py”，第230行，upgradedb格式
command.upgrade（配置“heads”）
文件“/opt/anaconda/lib/python3.4/site packages/alembic/command.py”，第174行，在升级中
script.run_env（）
文件“/opt/anaconda/lib/python3.4/site packages/alembic/script/base.py”，第416行，在run_env中
加载python文件（self.dir，'env.py'）
文件“/opt/anaconda/lib/python3.4/site packages/alembic/util/pyfiles.py”，第93行，在load\u python\u文件中
模块=加载模块（模块id，路径）
文件“/opt/anaconda/lib/python3.4/site packages/alembic/util/compat.py”，第79行，在加载模块中
mod=imp.load\u源（模块id、路径、fp）
文件“/opt/anaconda/lib/python3.4/site packages/afflow/migrations/env.py”，第74行，在
运行_迁移_联机（）
文件“/opt/anaconda/lib/python3.4/site packages/afflow/migrations/env.py”，第65行，运行迁移在线
比较类型=比较类型，
配置中第8行的文件“”
文件“/opt/anaconda/lib/python3.4/site packages/alembic/runtime/environment.py”，第773行，在configure中
opts=opts
文件“/opt/anaconda/lib/python3.4/site packages/alembic/runtime/migration.py”，第159行，在configure中
返回MigrationContext（方言、连接、选项、环境上下文）
文件“/opt/anaconda/lib/python3.4/site packages/alembic/runtime/migration.py”，第103行，在__
self.impl=ddl.DefaultImpl.get_by_方言（方言）(
文件“/opt/anaconda/lib/python3.4/site packages/alembic/ddl/impl.py”，第65行，以get_by_方言显示
return\u impls[方言.名称]
KeyError:“sybase”