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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Resolved] (CASSANDRA-2394) Faulty hd kills cluster performance
Date Sat, 04 Jun 2011 13:12:47 GMT


Jonathan Ellis resolved CASSANDRA-2394.

       Resolution: Not A Problem
    Fix Version/s:     (was: 0.7.7)

> Faulty hd kills cluster performance
> -----------------------------------
>                 Key: CASSANDRA-2394
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.7.4
>            Reporter: Thibaut
>            Priority: Minor
> Hi,
> About every week, a node from our main cluster (>100 nodes) has a faulty hd  (Listing
the cassandra data storage directoy triggers an input/output error).
> Whenever this occurs, I see many timeoutexceptions in our application on various nodes
which cause everything to run very very slowly. Keyrange scans just timeout and will sometimes
never succeed. If I stop cassandra on the faulty node, everything runs normal again.
> It would be great to have some kind of monitoring thread in cassandra which marks a node
as "down" if there are multiple read/write errors to the data directories. A single faulty
hd on 1 node shouldn't affect global cluster performance.

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