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Status Delivered
Workspace Spectrum LSF
Created by Guest
Created on May 15, 2018

RELATED IDEAS

LSF API should offer asynchronous event handler for job status notifications

It would be nice if LSF had functionality for job event notification similar to LDAP's LDAP_SERVER_NOTIFICATION_OID control (and Microsoft's Active Directory has this, as an LDAP implementation), where you can use an extended LDAP asynchronous search function to register a client to be notified when changes are made to an object in the directory service. A similar need exists for applications seeking to integrate into an LSF grid and control jobs on users' behalf. I know LSF isn't a directory service but the need here is very similar. Having to either poll mbatchd constantly via C API call lsb_readjobinfo() or shell out to "bjobs" to find out when the job of interest changes status, is less than ideal, and can also cause undesired load on mbatchd when operating at scale. Alternatively, calling lsb_geteventrec() to read lsb.events files in a shared file system might bypass mbatchd but is just another form of polling, honestly. And it relies on a shared file system (yuck!), and can contribute to undesired load on that shared file system (NFS or whatever) when operating at scale. Alternatively it's possible to wrap a thread around "bsub -K" for each job, but that is clearly an interface more suited to an interactive user, perhaps one running simple scripts individually, and requires parsing stderr output for status changes (yuck). It's not something a programmer would want to build a robust, enterprise-scale application around.

  • Guest
    Reply
    |     May 19, 2019

    In addition to bwait, you could also configure the MQ integration to have LSF publish events to a message queue https://github.com/IBMSpectrumComputing/lsfmq

  • Guest
    Reply
    |     Jun 8, 2018

    Have you looked at the bwait command which takes a similar syntax to a job dependency, but does not poll the server? (it gets a call back when the dependency is satisfied)

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