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From "Bill Farner (JIRA)" <>
Subject [jira] [Updated] (AURORA-116) Improve efficiency of saving host attributes (or avoid saving host attributes)
Date Fri, 14 Feb 2014 19:56:21 GMT


Bill Farner updated AURORA-116:

    Priority: Minor  (was: Critical)

Lowering to minor as the incremental change improved things pretty considerably.  Leaving
the issue open, though, as i think the proposal of saving HostAttributes only when needed
is a good one.

> Improve efficiency of saving host attributes (or avoid saving host attributes)
> ------------------------------------------------------------------------------
>                 Key: AURORA-116
>                 URL:
>             Project: Aurora
>          Issue Type: Task
>          Components: Reliability, Scheduler
>            Reporter: Bill Farner
>            Assignee: Bill Farner
>            Priority: Minor
> The scheduler performs multiple write operations for every resource offer, to save slave
> {noformat}
>   public void resourceOffers(SchedulerDriver driver, List<Offer> offers) {
>     Preconditions.checkState(registered, "Must be registered before receiving offers.");
>     for (final Offer offer : offers) {
>       log(Level.FINE, "Received offer: %s", offer);
>       resourceOffers.incrementAndGet();
>       storage.write(new MutateWork.NoResult.Quiet() {
>         @Override protected void execute(MutableStoreProvider storeProvider) {
>           storeProvider.getAttributeStore().saveHostAttributes(Conversions.getAttributes(offer));
>         }
>       });
> {noformat}
> This can unnecessarily block the singly-threaded message dispatch in the scheduler driver.
 An incremental improvement would be to aggregate all slave info and save it in one write
operation.  Better yet would be to perform writes asynchronously (taking care to not break
task scheduling, since attributes are expected to be present).  Even better yet, it would
be great to determine if we can avoid storing host attributes.

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