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From "Alex Petrov (Jira)" <>
Subject [jira] [Commented] (CASSANDRA-15404) Hint directory error affect cassandra process
Date Sun, 10 Nov 2019 11:15:00 GMT


Alex Petrov commented on CASSANDRA-15404:

Hint data is not as important as regular data. At the same time, if you have detected disk
failure while reading hints, commit log, data, or anything else, arguably you should still
trigger disk failure policy, since if hints and other files reside on the same disk (which
is usually the case), data will be affected by the failing disk at some point, too.

> Hint directory error  affect cassandra process 
> -----------------------------------------------
>                 Key: CASSANDRA-15404
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/Config, Local/Other
>            Reporter: maxwellguo
>            Assignee: maxwellguo
>            Priority: Normal
>             Fix For: 4.x
>         Attachments: image.png, log.png
> I use the default config to do some test. I delete all hint directory by mistake,but
my cassandra process at last stoped .Latter I found that that is because the hint directory
use the data disk policy . 
> In our production cluster , hint and cache's dir are set separately and are not the same
with data dir . And we know that cassandra can use multi data directory to store data, the
hint's data operation should not affect the data and commitlog 's read or write . Also 
> hint/cache 's data loss do not affect the cassandra's  correct read .
> so I think hint's disk_faily_policy should be separately. So we can got three type of

> disk faily policy for : data disk , commitlog disk  and hint disk 。
>  I don't know if my suggestion is meaningful. If it is, I would like to take over the
issue。I'm also happy to receive new suggestions.
> I thinks this is a  bug , but now I can not modify the Type of the issue . The situation
is easy to reproduce .The data disk policy use stop . every time you delete the hint directory
will cause the daemon's stop.Stop NativeTransport server and gossip .
>  !log.png! 

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