cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Roland Gude <roland.g...@yoochoose.com>
Subject AW: flushwriter all time blocked
Date Mon, 29 Aug 2011 14:06:03 GMT
Hi,

This still leaves me puzzled.

Is it a bad thing?
Why is it happening?

And what does "blocked before being accepted" mean? Does it mean Cassandra did not even try
to put the task into a queue?


Thanks for enlightening me,

roland


-----Ursprüngliche Nachricht-----
Von: Jonathan Ellis [mailto:jbellis@gmail.com] 
Gesendet: Montag, 29. August 2011 15:10
An: user@cassandra.apache.org
Betreff: Re: flushwriter all time blocked

the javadoc for the mbeans explains:

    /**
     * Get the number of tasks that had blocked before being accepted (or
     * rejected).
     */
    public int getTotalBlockedTasks();

    /**
     * Get the number of tasks currently blocked, waiting to be accepted by
     * the executor (because all threads are busy and the backing
queue is full).
     */
    public int getCurrentlyBlockedTasks();

On Mon, Aug 29, 2011 at 3:39 AM, Roland Gude <roland.gude@yoochoose.com> wrote:
> Hi all,
>
>
>
> On a 0.7.8 cluster In tpstats i can see flushwriter stage having several
> tasks in state all-time-blocked (immendiatly after node restart its 8 but
> grows over time to around 300). What does it mean (or how can I find out)
> and what can I do about it?
>
>
>
> --
>
> YOOCHOOSE GmbH
>
>
>
> Roland Gude
>
> Software Engineer
>
>
>
> Im Mediapark 8, 50670 Köln
>
>
>
> +49 221 4544151 (Tel)
>
> +49 221 4544159 (Fax)
>
> +49 171 7894057 (Mobil)
>
>
>
>
>
> Email: roland.gude@yoochoose.com
>
> WWW: www.yoochoose.com
>
>
>
> YOOCHOOSE GmbH
>
> Geschäftsführer: Dr. Uwe Alkemper, Michael Friedmann
>
> Handelsregister: Amtsgericht Köln HRB 65275
>
> Ust-Ident-Nr: DE 264 773 520
>
> Sitz der Gesellschaft: Köln
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com



Mime
View raw message