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https://issues.apache.org/jira/browse/MAPREDUCE-5643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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tang shanjiang updated MAPREDUCE-5643:
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Description:
Hadoop MRv1 uses the slot-based resource model with the static configuration of
map/reduce slots. There is a strict utility constrain that map tasks can only
run on map slots and reduce tasks can only use reduce slots. Due to the rigid
execution order between map and reduce tasks in a MapReduce environment, slots
can be severely under-utilized, which significantly degrades the performance.
In contrast to YARN that gives up the slot-based resource model to maximize
resource utilization, we keep the slot-based model and propose a dynamic slot
utilization optimization system called DynamicMR to improve the performance of
Hadoop by maximizing the slots utilization and improving utilization efficiency
while guaranteeing the fairness across pools. It consists of three levels of
scheduling components, namely, Dynamic Hadoop Fair Scheduler (DHFS), Dynamic
Speculative Task Scheduler (DSTS), and Data Locality Maximization Scheduler
(DLMS).
Our tests show that DynamicMR outperforms YARN for MapReduce workloads with
multiple jobs, especially when the number of jobs is large. The explanation is
that, given a certain number of resources, it is obvious that the performance
for the case with a ratio control of concurrently running map and reduce tasks
is better than without control. Because without control, it easily occurs that
there are too many reduce tasks running, causing the network to be a bottleneck
seriously. For YARN, both map and reduce tasks can run on any idle container.
There is no control mechanism for the ratio of resource allocation between map
and reduce tasks. It means that when there are pending reduce tasks, the idle
container will be most likely possessed by them. In contrast, DynamicMR follows
the traditional slot-based model. In contrast to the ’hard’ constrain of slot
allocation that map slots have to be allocated to map tasks and reduce tasks
should be dispatched to reduce tasks, DynamicMR obeys a ’soft’ constrain of
slot allocation to allow that map slot can be allocated to reduce task and vice
versa. But whenever there are pending map tasks, the map slot should be given
to map tasks first, and the rule is similar for reduce tasks. It means that,
the traditional way of static map/reduce slot configuration for the ratio
control of running map/reduce tasks still works for DynamicMR. In comparison to
YARN which maximizes the resource utilization only, DynamicMR can maximize the
slot resource utilization and meanwhile dynamically control the ratio of
running map/reduce tasks via map/reduce slot configuration.
was:
Hadoop MRv1 uses the slot-based resource model with the static configuration of
map/reduce slots in advance. Due to the rigid execution order between map and
reduce tasks in a MapReduce environment and the strict execution constrain that
map tasks can only run map slots and reduce tasks can only reduce slots, slots
can be severely under-utilized, which significantly degrades the performance.
In contrast to YARN that gives up the slot-based resource model to maximize
resource utilization, we keep the slot-based model and propose a dynamic slot
utilization optimization system called DynamicMR to improve the performance of
Hadoop by maximizing the slots utilization and improving utilization efficiency
while guaranteeing the fairness across pools. It consists of three levels of
scheduling components, namely, Dynamic Hadoop Fair Scheduler (DHFS), Dynamic
Speculative Task Scheduler (DSTS), and Data Locality Maximization Scheduler
(DLMS).
Our tests show that DynamicMR outperforms YARN for MapReduce workloads with
multiple jobs, especially when the number of jobs is large.
> DynamicMR: A Dynamic Slot Utilization Optimization Framework for Hadoop MRv1
> ----------------------------------------------------------------------------
>
> Key: MAPREDUCE-5643
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5643
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: contrib/fair-share
> Affects Versions: 1.2.1
> Reporter: tang shanjiang
> Assignee: tang shanjiang
> Labels: performance
> Attachments: DynamicMR-0.1.1-patch, README
>
>
> Hadoop MRv1 uses the slot-based resource model with the static configuration
> of map/reduce slots. There is a strict utility constrain that map tasks can
> only run on map slots and reduce tasks can only use reduce slots. Due to the
> rigid execution order between map and reduce tasks in a MapReduce
> environment, slots can be severely under-utilized, which significantly
> degrades the performance.
> In contrast to YARN that gives up the slot-based resource model to maximize
> resource utilization, we keep the slot-based model and propose a dynamic slot
> utilization optimization system called DynamicMR to improve the performance
> of Hadoop by maximizing the slots utilization and improving utilization
> efficiency while guaranteeing the fairness across pools. It consists of three
> levels of scheduling components, namely, Dynamic Hadoop Fair Scheduler
> (DHFS), Dynamic Speculative Task Scheduler (DSTS), and Data Locality
> Maximization Scheduler (DLMS).
> Our tests show that DynamicMR outperforms YARN for MapReduce workloads with
> multiple jobs, especially when the number of jobs is large. The explanation
> is that, given a certain number of resources, it is obvious that the
> performance for the case with a ratio control of concurrently running map and
> reduce tasks is better than without control. Because without control, it
> easily occurs that there are too many reduce tasks running, causing the
> network to be a bottleneck seriously. For YARN, both map and reduce tasks can
> run on any idle container. There is no control mechanism for the ratio of
> resource allocation between map and reduce tasks. It means that when there
> are pending reduce tasks, the idle container will be most likely possessed by
> them. In contrast, DynamicMR follows the traditional slot-based model. In
> contrast to the ’hard’ constrain of slot allocation that map slots have to be
> allocated to map tasks and reduce tasks should be dispatched to reduce tasks,
> DynamicMR obeys a ’soft’ constrain of slot allocation to allow that map slot
> can be allocated to reduce task and vice versa. But whenever there are
> pending map tasks, the map slot should be given to map tasks first, and the
> rule is similar for reduce tasks. It means that, the traditional way of
> static map/reduce slot configuration for the ratio control of running
> map/reduce tasks still works for DynamicMR. In comparison to YARN which
> maximizes the resource utilization only, DynamicMR can maximize the slot
> resource utilization and meanwhile dynamically control the ratio of running
> map/reduce tasks via map/reduce slot configuration.
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