cassandra错误“批量太大”使用python答案

【问题标题】：cassandra error "Batch too large" using pythoncassandra错误“批量太大”使用python
【发布时间】：2019-12-21 04:48:48
【问题描述】：

我正在尝试通过使用 json 模块从 json 中检索列然后使用准备好的语句将其插入到 cassandra 中来将 json 文件插入到 cassandra 表中。该文件准确地说是 2778ko。我不知道如何插入它。请帮忙！！！

query = """
        INSERT INTO profile9 (id,profilelegacy,profilealternative,aboutlegacy,skills,recommendations,accomplishments,peoplealsoviewed,volunteerExperience,profile)
          VALUES (?,?,?,?,?,?,?,?,?,?);

          """

        insert_user = session.prepare(query)
        batch = BatchStatement(consistency_level=ConsistencyLevel.ONE)
        batch.add(insert_user, (idd, profileLegacy, profilealternative, aboutlegacy, skills,
                                recommendations, accomplishments, peopleAlsoviewed, volunteerExperience, profile,))
        log = logging.getLogger()
        log.info('Batch Insert Completed')
        session.execute(batch)

我收到此错误

line 64, in parsing
    session.execute(batch)
  File "C:\Python\Python37\lib\site-packages\cassandra\cluster.py", line 2240, in execute
    timeout, execution_profile, paging_state, host).result()
  File "C:\Python\Python37\lib\site-packages\cassandra\cluster.py", line 4198, in result
    raise self._final_exception
cassandra.InvalidRequest: Error from server: code=2200 [Invalid query] message="Batch too large"

【问题讨论】：

标签： python json cassandra cqlsh

【解决方案1】：

这里没有理由使用批处理，它只会让事情变慢并施加大小限制。只需将其更改为：

# only prepare this once
prepared = session.prepare(query)
...
session.execute(prepared.bind((idd, profileLegacy, profilealternative, aboutlegacy, skills,
                        recommendations, accomplishments, peopleAlsoviewed, volunteerExperience, profile,)))

【讨论】：