我看了看nodetool和jmx,并没有找到相关的功能，但是不确定是不是自己漏掉了。
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读取Commitlog内容的开源代码，很久以前Apache Cassandra Committer的圈子里提到过这个：https://github.com/carloscm/cassandra-commitlog-extract。但是这个现在没法直接拿来用，因为是Cassandra的史前时代（2012年）写的。只能看看有没有借鉴意义。
新一点的代码里，CDC（Change Data Capture）也需要读CommitLog，可以看看这里的函数调用：https://github.com/apache/cassandra/blob/e31e216234c6b57a531cae607e0355666007deb2/src/java/org/apache/cassandra/db/commitlog/CommitLogReplayer.java#L132-L140，有一个叫org.apache.cassandra.db.commitlog.CommitLogReader的类可以直接拿来用。CDC的这个文档里有提及：http://cassandra.apache.org/doc/latest/operating/cdc.html#reading-commitlogsegments
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