红帽全球峰会72.6. 幂等存储库
NamedCassandraIdempotentRepository 将消息密钥存储在 Cassandra 表中，如下所示：
CAMEL_IDEMPOTENT.cql
CREATE TABLE CAMEL_IDEMPOTENT (
NAME varchar, -- Repository name
KEY varchar, -- Message key
PRIMARY KEY (NAME, KEY)
) WITH compaction = {'class':'LeveledCompactionStrategy'}
AND gc_grace_seconds = 86400;此存储库实施使用轻量级事务（也称为 Compare 和 Set），并且需要 Cassandra 2.0.7+。
另外，CassandraIdempotentRepository 没有 NAME 列，并可扩展为使用其他数据模型。
| 选项 | 默认值 | 描述 |
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| 表名称 |
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| 主键列 |
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存储库名称，用于 | |
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| live 的关键时间 | |
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用于插入/删除密钥的一致性级别： | |
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用于读取/检查键的一致性级别： |
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