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From Tim Bain <tb...@alumni.duke.edu>
Subject Re: Active MQ Shared File System Master Slave with Elastic File System
Date Fri, 09 Sep 2016 12:38:12 GMT
Nice article.  One suggestion: you should link to the relevant wiki page (
http://activemq.apache.org/pluggable-storage-lockers.html) for anyone who
wants more information.

On Sep 8, 2016 11:34 PM, "Justin Reock" <Justin.Reock@roguewave.com> wrote:

Thanks Tim! I recently posted a blog article on this subject, if the user
community would like some details about the pluggable storage locker
implementation:  http://blog.klocwork.com/open-source/pluggable-storage-
lockers-for-activemq/

I hope it’s helpful.

-Justin


On 9/2/16, 11:53 PM, "tbain98@gmail.com on behalf of Tim Bain" <
tbain98@gmail.com on behalf of tbain@alumni.duke.edu> wrote:

    It rules out using EFS for your locker implementation, but as Justin
said,
    pluggable lockers would allow you to put your data into an EFS but use
    another mechanism for locking to determine ownership.  But obviously
there
    would need to be a fix to the code that figures out whether there's
enough
    space on the volume before that would work.

    Tim

    On Fri, Sep 2, 2016 at 4:17 PM, ishmeister <ibhana@visibilityltd.com>
wrote:

    > The issue is perhaps that EFS supports NFS4 but with the following
    > limitations:
    >
    > http://docs.aws.amazon.com/efs/latest/ug/nfs4-
unsupported-features.html
    >
    > In particular: "All locks in Amazon EFS are advisory, which means
that READ
    > and WRITE operations do not check for conflicting locks before the
    > operation
    > is executed."
    >
    > Whereas the ActiveMQ docs seem to be quite clear on this matter:
"Note that
    > the requirements of this failover system are a distributed file
system like
    > a SAN for which exclusive file locks work reliably."
    >
    > http://activemq.apache.org/shared-file-system-master-slave.html
    >
    > So I guess that effectively rules out using EFS.
    >
    >
    >
    > --
    > View this message in context: http://activemq.2283324.n4.
    > nabble.com/Active-MQ-Shared-File-System-Master-Slave-with-
    > Elastic-File-System-tp4715818p4716132.html
    > Sent from the ActiveMQ - User mailing list archive at Nabble.com.
    >

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