Cassandra system.hints表是空的，即使当节点之一关闭 [英] Cassandra system.hints table is empty even when the one of the node is down

问题描述

我正在从academy.datastax.com学习Cassandra。我在本地机器上尝试复制和一致性演示。 RF = 3和Consistency = 1。

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

当我的Node3关闭并且使用update命令更新我的表时，SYSTEM.HINTS表需要存储node3的提示但它总是空的。

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.

我需要进行任何配置更改提示工作或默认值是否确定？

Do I need to make any configurational changes for hints to work or the defaults are ok?

surjanrawat$ ccm node1 nodetool getendpoints mykeyspace mytable 1
127.0.0.3
127.0.0.4
127.0.0.5

surjanrawat$ ccm status
Cluster: 'mycluster'
--------------------
node1: UP
node3: DOWN
node2: UP
node5: UP
node4: UP

cqlsh:mykeyspace> select * from system.hints ;

 target_id | hint_id | message_version | mutation
-----------+---------+-----------------+----------

(0 rows)

推荐答案

您是否使用完全相同的Cassandra版本来创建集群？从版本3+起，提示存储在协调器的本地文件系统中。我问这是因为在Datastax演示中我发生了完全相同的事情（我使用3.0.3而不是2.1.5）我重新播放的步骤，但与2.1.5和提示在那里的表，正如预期。

Did you use the exact same version of Cassandra to create the cluster? Since version 3+ the hints are stored in the local filesystem of the coordinator. I ask this because the exact same thing happened to me during that Datastax demo (I used 3.0.3 instead of 2.1.5) I replayed the steps but with 2.1.5 and the hints where there in the table just as expected.

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