Re: Spark scheduling mode
Just because you've flipped spark.scheduler.mode to FAIR, that doesn't mean that Spark can magically configure and start multiple scheduling pools for you, nor can it know to which pools you want jobs assigned. Without doing any setup of additional scheduling pools or assigning of jobs to pools, you're just dumping all of your jobs into the one available default pool (which is now being fair scheduled with an empty set of other pools) and the scheduling of jobs within that pool is still the default intra-pool scheduling, FIFO -- i.e., you've effectively accomplished nothing by only flipping spark.scheduler.mode to FAIR. On Thu, Sep 1, 2016 at 7:10 AM, enrico d'urso wrote: > I am building a Spark App, in which I submit several jobs (pyspark). I am > using threads to run them in parallel, and also I am setting: > conf.set("spark.scheduler.mode", "FAIR") Still, I see the jobs run > serially in FIFO way. Am I missing something? > > Cheers, > > > Enrico >
Re: Spark scheduling mode
Is there a way to force scheduling to be fair inside the default pool? I mean, round robin for the jobs that belong to the default pool. Cheers, From: Mark Hamstra Sent: Thursday, September 1, 2016 7:24:54 PM To: enrico d'urso Cc: user@spark.apache.org Subject: Re: Spark scheduling mode Just because you've flipped spark.scheduler.mode to FAIR, that doesn't mean that Spark can magically configure and start multiple scheduling pools for you, nor can it know to which pools you want jobs assigned. Without doing any setup of additional scheduling pools or assigning of jobs to pools, you're just dumping all of your jobs into the one available default pool (which is now being fair scheduled with an empty set of other pools) and the scheduling of jobs within that pool is still the default intra-pool scheduling, FIFO -- i.e., you've effectively accomplished nothing by only flipping spark.scheduler.mode to FAIR. On Thu, Sep 1, 2016 at 7:10 AM, enrico d'urso mailto:e.du...@live.com>> wrote: I am building a Spark App, in which I submit several jobs (pyspark). I am using threads to run them in parallel, and also I am setting: conf.set("spark.scheduler.mode", "FAIR") Still, I see the jobs run serially in FIFO way. Am I missing something? Cheers, Enrico
Re: Spark scheduling mode
The default pool (``) can be configured like any other pool: https://spark.apache.org/docs/latest/job-scheduling.html#configuring-pool-properties On Thu, Sep 1, 2016 at 11:11 AM, enrico d'urso wrote: > Is there a way to force scheduling to be fair *inside* the default pool? > I mean, round robin for the jobs that belong to the default pool. > > Cheers, > -- > *From:* Mark Hamstra > *Sent:* Thursday, September 1, 2016 7:24:54 PM > *To:* enrico d'urso > *Cc:* user@spark.apache.org > *Subject:* Re: Spark scheduling mode > > Just because you've flipped spark.scheduler.mode to FAIR, that doesn't > mean that Spark can magically configure and start multiple scheduling pools > for you, nor can it know to which pools you want jobs assigned. Without > doing any setup of additional scheduling pools or assigning of jobs to > pools, you're just dumping all of your jobs into the one available default > pool (which is now being fair scheduled with an empty set of other pools) > and the scheduling of jobs within that pool is still the default intra-pool > scheduling, FIFO -- i.e., you've effectively accomplished nothing by only > flipping spark.scheduler.mode to FAIR. > > On Thu, Sep 1, 2016 at 7:10 AM, enrico d'urso wrote: > >> I am building a Spark App, in which I submit several jobs (pyspark). I am >> using threads to run them in parallel, and also I am setting: >> conf.set("spark.scheduler.mode", "FAIR") Still, I see the jobs run >> serially in FIFO way. Am I missing something? >> >> Cheers, >> >> >> Enrico >> > >
Re: Spark scheduling mode
I tried it before, but still I am not able to see a proper round robin across the jobs I submit. Given this: FAIR 1 2 Each jobs inside production pool should be scheduled in round robin way, am I right? From: Mark Hamstra Sent: Thursday, September 1, 2016 8:19:44 PM To: enrico d'urso Cc: user@spark.apache.org Subject: Re: Spark scheduling mode The default pool (``) can be configured like any other pool: https://spark.apache.org/docs/latest/job-scheduling.html#configuring-pool-properties On Thu, Sep 1, 2016 at 11:11 AM, enrico d'urso mailto:e.du...@live.com>> wrote: Is there a way to force scheduling to be fair inside the default pool? I mean, round robin for the jobs that belong to the default pool. Cheers, From: Mark Hamstra mailto:m...@clearstorydata.com>> Sent: Thursday, September 1, 2016 7:24:54 PM To: enrico d'urso Cc: user@spark.apache.org<mailto:user@spark.apache.org> Subject: Re: Spark scheduling mode Just because you've flipped spark.scheduler.mode to FAIR, that doesn't mean that Spark can magically configure and start multiple scheduling pools for you, nor can it know to which pools you want jobs assigned. Without doing any setup of additional scheduling pools or assigning of jobs to pools, you're just dumping all of your jobs into the one available default pool (which is now being fair scheduled with an empty set of other pools) and the scheduling of jobs within that pool is still the default intra-pool scheduling, FIFO -- i.e., you've effectively accomplished nothing by only flipping spark.scheduler.mode to FAIR. On Thu, Sep 1, 2016 at 7:10 AM, enrico d'urso mailto:e.du...@live.com>> wrote: I am building a Spark App, in which I submit several jobs (pyspark). I am using threads to run them in parallel, and also I am setting: conf.set("spark.scheduler.mode", "FAIR") Still, I see the jobs run serially in FIFO way. Am I missing something? Cheers, Enrico
Re: Spark scheduling mode
Spark's FairSchedulingAlgorithm is not round robin: https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/SchedulingAlgorithm.scala#L43 When at the scope of fair scheduling Jobs within a single Pool, the Schedulable entities being handled (s1 and s2) are TaskSetManagers, which are at the granularity of Stages, not Jobs. Since weight is 1 and minShare is 0 for TaskSetManagers, the FairSchedulingAlgorithm for TaskSetManagers just boils down to prioritizing TaskSets (i.e. Stages) with the fewest number of runningTasks. On Thu, Sep 1, 2016 at 11:23 AM, enrico d'urso wrote: > I tried it before, but still I am not able to see a proper round robin > across the jobs I submit. > Given this: > > > FAIR > 1 > 2 > > > Each jobs inside production pool should be scheduled in round robin way, > am I right? > > -- > *From:* Mark Hamstra > *Sent:* Thursday, September 1, 2016 8:19:44 PM > *To:* enrico d'urso > *Cc:* user@spark.apache.org > *Subject:* Re: Spark scheduling mode > > The default pool (``) can be configured like any > other pool: https://spark.apache.org/docs/latest/job- > scheduling.html#configuring-pool-properties > > On Thu, Sep 1, 2016 at 11:11 AM, enrico d'urso wrote: > >> Is there a way to force scheduling to be fair *inside* the default pool? >> I mean, round robin for the jobs that belong to the default pool. >> >> Cheers, >> -- >> *From:* Mark Hamstra >> *Sent:* Thursday, September 1, 2016 7:24:54 PM >> *To:* enrico d'urso >> *Cc:* user@spark.apache.org >> *Subject:* Re: Spark scheduling mode >> >> Just because you've flipped spark.scheduler.mode to FAIR, that doesn't >> mean that Spark can magically configure and start multiple scheduling pools >> for you, nor can it know to which pools you want jobs assigned. Without >> doing any setup of additional scheduling pools or assigning of jobs to >> pools, you're just dumping all of your jobs into the one available default >> pool (which is now being fair scheduled with an empty set of other pools) >> and the scheduling of jobs within that pool is still the default intra-pool >> scheduling, FIFO -- i.e., you've effectively accomplished nothing by only >> flipping spark.scheduler.mode to FAIR. >> >> On Thu, Sep 1, 2016 at 7:10 AM, enrico d'urso wrote: >> >>> I am building a Spark App, in which I submit several jobs (pyspark). I >>> am using threads to run them in parallel, and also I am setting: >>> conf.set("spark.scheduler.mode", "FAIR") Still, I see the jobs run >>> serially in FIFO way. Am I missing something? >>> >>> Cheers, >>> >>> >>> Enrico >>> >> >> >
Re: Spark scheduling mode
Thank you. May I know when that comparator is called? It looks like spark scheduler has not any form of preemption, am I right? Thank you From: Mark Hamstra Sent: Thursday, September 1, 2016 8:44:10 PM To: enrico d'urso Cc: user@spark.apache.org Subject: Re: Spark scheduling mode Spark's FairSchedulingAlgorithm is not round robin: https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/SchedulingAlgorithm.scala#L43 When at the scope of fair scheduling Jobs within a single Pool, the Schedulable entities being handled (s1 and s2) are TaskSetManagers, which are at the granularity of Stages, not Jobs. Since weight is 1 and minShare is 0 for TaskSetManagers, the FairSchedulingAlgorithm for TaskSetManagers just boils down to prioritizing TaskSets (i.e. Stages) with the fewest number of runningTasks. On Thu, Sep 1, 2016 at 11:23 AM, enrico d'urso mailto:e.du...@live.com>> wrote: I tried it before, but still I am not able to see a proper round robin across the jobs I submit. Given this: FAIR 1 2 Each jobs inside production pool should be scheduled in round robin way, am I right? From: Mark Hamstra mailto:m...@clearstorydata.com>> Sent: Thursday, September 1, 2016 8:19:44 PM To: enrico d'urso Cc: user@spark.apache.org<mailto:user@spark.apache.org> Subject: Re: Spark scheduling mode The default pool (``) can be configured like any other pool: https://spark.apache.org/docs/latest/job-scheduling.html#configuring-pool-properties On Thu, Sep 1, 2016 at 11:11 AM, enrico d'urso mailto:e.du...@live.com>> wrote: Is there a way to force scheduling to be fair inside the default pool? I mean, round robin for the jobs that belong to the default pool. Cheers, From: Mark Hamstra mailto:m...@clearstorydata.com>> Sent: Thursday, September 1, 2016 7:24:54 PM To: enrico d'urso Cc: user@spark.apache.org<mailto:user@spark.apache.org> Subject: Re: Spark scheduling mode Just because you've flipped spark.scheduler.mode to FAIR, that doesn't mean that Spark can magically configure and start multiple scheduling pools for you, nor can it know to which pools you want jobs assigned. Without doing any setup of additional scheduling pools or assigning of jobs to pools, you're just dumping all of your jobs into the one available default pool (which is now being fair scheduled with an empty set of other pools) and the scheduling of jobs within that pool is still the default intra-pool scheduling, FIFO -- i.e., you've effectively accomplished nothing by only flipping spark.scheduler.mode to FAIR. On Thu, Sep 1, 2016 at 7:10 AM, enrico d'urso mailto:e.du...@live.com>> wrote: I am building a Spark App, in which I submit several jobs (pyspark). I am using threads to run them in parallel, and also I am setting: conf.set("spark.scheduler.mode", "FAIR") Still, I see the jobs run serially in FIFO way. Am I missing something? Cheers, Enrico
Re: Spark scheduling mode
The comparator is used in `Pool#getSortedTaskSetQueue`. The `TaskSchedulerImpl` calls that on the rootPool when the TaskScheduler needs to handle `resourceOffers` for available Executor cores. Creation of the `sortedTaskSets` is a recursive, nested sorting of the `Schedulable` entities -- you can have pools within pools within pools within... if you really want to, but they eventually bottom out in TaskSetManagers. The `sortedTaskSets` is a flattened queue of the TaskSets, and the available cores are offered to those TaskSets in that queued order until the next time the scheduler backend handles the available resource offers and a new `sortedTaskSets` is generated. On Fri, Sep 2, 2016 at 2:37 AM, enrico d'urso wrote: > Thank you. > > May I know when that comparator is called? > It looks like spark scheduler has not any form of preemption, am I right? > > Thank you > -- > *From:* Mark Hamstra > *Sent:* Thursday, September 1, 2016 8:44:10 PM > > *To:* enrico d'urso > *Cc:* user@spark.apache.org > *Subject:* Re: Spark scheduling mode > > Spark's FairSchedulingAlgorithm is not round robin: https://github.com/ > apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/ > SchedulingAlgorithm.scala#L43 > > When at the scope of fair scheduling Jobs within a single Pool, the > Schedulable entities being handled (s1 and s2) are TaskSetManagers, which > are at the granularity of Stages, not Jobs. Since weight is 1 and minShare > is 0 for TaskSetManagers, the FairSchedulingAlgorithm for TaskSetManagers > just boils down to prioritizing TaskSets (i.e. Stages) with the fewest > number of runningTasks. > > On Thu, Sep 1, 2016 at 11:23 AM, enrico d'urso wrote: > >> I tried it before, but still I am not able to see a proper round robin >> across the jobs I submit. >> Given this: >> >> >> FAIR >> 1 >> 2 >> >> >> Each jobs inside production pool should be scheduled in round robin way, >> am I right? >> >> -- >> *From:* Mark Hamstra >> *Sent:* Thursday, September 1, 2016 8:19:44 PM >> *To:* enrico d'urso >> *Cc:* user@spark.apache.org >> *Subject:* Re: Spark scheduling mode >> >> The default pool (``) can be configured like any >> other pool: https://spark.apache.org/docs/latest/job-scheduling. >> html#configuring-pool-properties >> >> On Thu, Sep 1, 2016 at 11:11 AM, enrico d'urso wrote: >> >>> Is there a way to force scheduling to be fair *inside* the default pool? >>> I mean, round robin for the jobs that belong to the default pool. >>> >>> Cheers, >>> -- >>> *From:* Mark Hamstra >>> *Sent:* Thursday, September 1, 2016 7:24:54 PM >>> *To:* enrico d'urso >>> *Cc:* user@spark.apache.org >>> *Subject:* Re: Spark scheduling mode >>> >>> Just because you've flipped spark.scheduler.mode to FAIR, that doesn't >>> mean that Spark can magically configure and start multiple scheduling pools >>> for you, nor can it know to which pools you want jobs assigned. Without >>> doing any setup of additional scheduling pools or assigning of jobs to >>> pools, you're just dumping all of your jobs into the one available default >>> pool (which is now being fair scheduled with an empty set of other pools) >>> and the scheduling of jobs within that pool is still the default intra-pool >>> scheduling, FIFO -- i.e., you've effectively accomplished nothing by only >>> flipping spark.scheduler.mode to FAIR. >>> >>> On Thu, Sep 1, 2016 at 7:10 AM, enrico d'urso wrote: >>> >>>> I am building a Spark App, in which I submit several jobs (pyspark). I >>>> am using threads to run them in parallel, and also I am setting: >>>> conf.set("spark.scheduler.mode", "FAIR") Still, I see the jobs run >>>> serially in FIFO way. Am I missing something? >>>> >>>> Cheers, >>>> >>>> >>>> Enrico >>>> >>> >>> >> >
Re: Spark scheduling mode
And, no, Spark's scheduler will not preempt already running Tasks. In fact, just killing running Tasks for any reason is trickier than we'd like it to be, so it isn't done by default: https://issues.apache.org/jira/browse/SPARK-17064 On Fri, Sep 2, 2016 at 11:34 AM, Mark Hamstra wrote: > The comparator is used in `Pool#getSortedTaskSetQueue`. The > `TaskSchedulerImpl` calls that on the rootPool when the TaskScheduler needs > to handle `resourceOffers` for available Executor cores. Creation of the > `sortedTaskSets` is a recursive, nested sorting of the `Schedulable` > entities -- you can have pools within pools within pools within... if you > really want to, but they eventually bottom out in TaskSetManagers. The > `sortedTaskSets` is a flattened queue of the TaskSets, and the available > cores are offered to those TaskSets in that queued order until the next > time the scheduler backend handles the available resource offers and a new > `sortedTaskSets` is generated. > > On Fri, Sep 2, 2016 at 2:37 AM, enrico d'urso wrote: > >> Thank you. >> >> May I know when that comparator is called? >> It looks like spark scheduler has not any form of preemption, am I right? >> >> Thank you >> -- >> *From:* Mark Hamstra >> *Sent:* Thursday, September 1, 2016 8:44:10 PM >> >> *To:* enrico d'urso >> *Cc:* user@spark.apache.org >> *Subject:* Re: Spark scheduling mode >> >> Spark's FairSchedulingAlgorithm is not round robin: >> https://github.com/apache/spark/blob/master/core/src/ >> main/scala/org/apache/spark/scheduler/SchedulingAlgorithm.scala#L43 >> >> When at the scope of fair scheduling Jobs within a single Pool, the >> Schedulable entities being handled (s1 and s2) are TaskSetManagers, which >> are at the granularity of Stages, not Jobs. Since weight is 1 and minShare >> is 0 for TaskSetManagers, the FairSchedulingAlgorithm for TaskSetManagers >> just boils down to prioritizing TaskSets (i.e. Stages) with the fewest >> number of runningTasks. >> >> On Thu, Sep 1, 2016 at 11:23 AM, enrico d'urso wrote: >> >>> I tried it before, but still I am not able to see a proper round robin >>> across the jobs I submit. >>> Given this: >>> >>> >>> FAIR >>> 1 >>> 2 >>> >>> >>> Each jobs inside production pool should be scheduled in round robin way, >>> am I right? >>> >>> -- >>> *From:* Mark Hamstra >>> *Sent:* Thursday, September 1, 2016 8:19:44 PM >>> *To:* enrico d'urso >>> *Cc:* user@spark.apache.org >>> *Subject:* Re: Spark scheduling mode >>> >>> The default pool (``) can be configured like any >>> other pool: https://spark.apache.org/docs/latest/job-scheduling.ht >>> ml#configuring-pool-properties >>> >>> On Thu, Sep 1, 2016 at 11:11 AM, enrico d'urso wrote: >>> >>>> Is there a way to force scheduling to be fair *inside* the default >>>> pool? >>>> I mean, round robin for the jobs that belong to the default pool. >>>> >>>> Cheers, >>>> -- >>>> *From:* Mark Hamstra >>>> *Sent:* Thursday, September 1, 2016 7:24:54 PM >>>> *To:* enrico d'urso >>>> *Cc:* user@spark.apache.org >>>> *Subject:* Re: Spark scheduling mode >>>> >>>> Just because you've flipped spark.scheduler.mode to FAIR, that doesn't >>>> mean that Spark can magically configure and start multiple scheduling pools >>>> for you, nor can it know to which pools you want jobs assigned. Without >>>> doing any setup of additional scheduling pools or assigning of jobs to >>>> pools, you're just dumping all of your jobs into the one available default >>>> pool (which is now being fair scheduled with an empty set of other pools) >>>> and the scheduling of jobs within that pool is still the default intra-pool >>>> scheduling, FIFO -- i.e., you've effectively accomplished nothing by only >>>> flipping spark.scheduler.mode to FAIR. >>>> >>>> On Thu, Sep 1, 2016 at 7:10 AM, enrico d'urso wrote: >>>> >>>>> I am building a Spark App, in which I submit several jobs (pyspark). I >>>>> am using threads to run them in parallel, and also I am setting: >>>>> conf.set("spark.scheduler.mode", "FAIR") Still, I see the jobs run >>>>> serially in FIFO way. Am I missing something? >>>>> >>>>> Cheers, >>>>> >>>>> >>>>> Enrico >>>>> >>>> >>>> >>> >> >