cassandra - 如何检查 Cassandra 节点上的本地提示目录？

Question

我遇到了与 Cassandra system.hints table is empty even when the one of the node is down 相同的问题:

I am learning Cassandra from academy.datastax.com. I am trying the Replication and Consistency demo on local machine. RF = 3 and Consistency = 1.

When my Node3 is down and I am updating my table using update command, the SYSTEM.HINTS table is expected to store hint for node3 but it is always empty.

@amalober 指出这是由于使用的 Cassandra 版本不同所致。来自 DataStax 的 Cassandra 文档:

In Cassandra 3.0 and later, the hint is stored in a local hints directory on each node for improved replay.

3 年前有人问过同样的问题，How to access the local data of a Cassandra node ，但公认的解决方案是

...Hack something together using the Cassandra source that reads SSTables and have that feed the local client you're hoping to build. A great starting point would be looking at the source of org.apache.cassandra.tools.SSTableExport which is used in the sstable2json tool.

有没有更简单的方法来访问 Cassandra 节点的本地 hints 目录？

Answer 1

Is there an easier way to access the local hints directory of a Cassandra node?

提示目录在 $CASSANDRA_HOME/conf/cassandra.yaml 文件中定义(有时它也位于 /etc/cassandra 下，具体取决于您安装 Cassandra 的方式)

查找属性 hints_directory