RE: Question on Read Repair

[Anubhav Kale <An...@microsoft.com>]

Does it work the same way for writes as well ? If “nodetool status” shows that a node is DN, would writes fail right away assuming enough nodes are down to fail QUORUM ?

From: Jeff Jirsa [mailto:jeff.jirsa@crowdstrike.com]
Sent: Tuesday, October 11, 2016 1:13 PM
To: user@cassandra.apache.org
Subject: Re: Question on Read Repair

Yes:

https://github.com/apache/cassandra/blob/81f6c784ce967fadb6ed7f58de1328e713eaf53c/src/java/org/apache/cassandra/db/ConsistencyLevel.java#L286



From: Anubhav Kale <An...@microsoft.com>>
Reply-To: "user@cassandra.apache.org<ma...@cassandra.apache.org>" <us...@cassandra.apache.org>>
Date: Tuesday, October 11, 2016 at 11:45 AM
To: "user@cassandra.apache.org<ma...@cassandra.apache.org>" <us...@cassandra.apache.org>>
Subject: RE: Question on Read Repair

Thank you.

Interesting detail. Does it work the same way for other consistency levels as well ?

From: Jeff Jirsa [mailto:jeff.jirsa@crowdstrike.com]
Sent: Tuesday, October 11, 2016 10:29 AM
To: user@cassandra.apache.org<ma...@cassandra.apache.org>
Subject: Re: Question on Read Repair

If the failuredetector knows that the node is down, it won’t attempt a read, because the consistency level can’t be satisfied – none of the other replicas will be repaired.


From: Anubhav Kale <An...@microsoft.com>>
Reply-To: "user@cassandra.apache.org<ma...@cassandra.apache.org>" <us...@cassandra.apache.org>>
Date: Tuesday, October 11, 2016 at 10:24 AM
To: "user@cassandra.apache.org<ma...@cassandra.apache.org>" <us...@cassandra.apache.org>>
Subject: Question on Read Repair

Hello,

This is more of a theory / concept question. I set CL=ALL and do a read. Say one replica was down, will the rest of the replicas get repaired as part of this ? (I am hoping the answer is yes).

Thanks !
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