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From aaron morton <>
Subject Re: HintedHandoff increases in read?
Date Sun, 20 Mar 2011 23:34:08 GMT
Can we get some more information...

- What is countPendingHints showing ? Are they all for the same row ? 
- What about listEndpointsPendingHints are their different end points listed there ?
- Can you turn up the logging to DEBUG on one of the machines that has the increasing number
of hints ? When a node is asked to store a hint it will log a message with "Adding hint for"
You should then see a message that includes "applied.  Sending response to"
- Number of nodes and RF ?

ReadRepair does not use HintedHandoff as part of it's processing. 

Hope that helps. 

On 19 Mar 2011, at 05:10, Shotaro Kamio wrote:

> Hi,
> When I looking at "countPendingHints" in HintedHandoffManager via jmx,
> I found that pending hints increases even when my cluster handles only
> reads with quorum from clients.
> The count decreases when I see it in long period (e.g., in an hour).
> But it can increase in several thousands in short period (for
> instance, in a few seconds. even in minutes some cases). My cluster
> looks healthy at that time.
> Is it normal behavior? I thought that hints are created only when data
> are written and a node is down. Does it increase with read repair?
> I'm waiting for finishing hinted handoff. But it takes long time.
> I'm using cassandra 0.7.4.
> Best regards,
> Shtoaro

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