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From Yingyi Bu <buyin...@gmail.com>
Subject Re: [jira] [Commented] (ASTERIXDB-1076) False failures cause denying new queries
Date Fri, 11 Sep 2015 23:59:18 GMT
All right, I'll try that approach.

Best,
Yingyi

On Fri, Sep 11, 2015 at 4:51 PM, Till Westmann (JIRA) <jira@apache.org>
wrote:

>
>     [
> https://issues.apache.org/jira/browse/ASTERIXDB-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741745#comment-14741745
> ]
>
> Till Westmann commented on ASTERIXDB-1076:
> ------------------------------------------
>
> Yes, I think that's worth a try. There seems to be no obvious way to
> change the priority of the timer thread, so it might be the cleanest route
> to create our own thread for that.
>
> > False failures cause denying new queries
> > ----------------------------------------
> >
> >                 Key: ASTERIXDB-1076
> >                 URL:
> https://issues.apache.org/jira/browse/ASTERIXDB-1076
> >             Project: Apache AsterixDB
> >          Issue Type: Bug
> >          Components: AsterixDB
> >            Reporter: Yingyi Bu
> >            Priority: Critical
> >
> > When CPUs in the cluster are saturated for computations,  the heartbeat
> from slave nodes to the master node might get delayed.  In this case, the
> master node thinks a node fails, and can no longer adds the node back.
> Hence, the entire cluster is not usable and an instance restart is needed.
> > Two things need to be fixed:
> > 1.  (at least) expose AsterixDB configuration parameters to allow users
> to set a large heartbeat threshold;
> > 2.  allow a node to leave and re-join a hyracks cluster.
> > In the long term, we might need to investigate better liveness check
> strategies.
> > To reproduce that issue,  just let slave nodes' CPUs overloaded and you
> will see that.
> > The exception " Asterix Cluster Global recovery is not yet complete and
> The system is in ACTIVE state" will be thrown for upcoming queries.
>
>
>
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