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Hudson commented on YARN-1769: ------------------------------ SUCCESS: Integrated in Hadoop-Hdfs-trunk #1887 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1887/]) YARN-1769. CapacityScheduler: Improve reservations. Contributed by Thomas Graves (jlowe: rev 9c22065109a77681bc2534063eabe8692fbcb3cd) * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestParentQueue.java * hadoop-yarn-project/CHANGES.txt * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestApplicationLimits.java * hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/LeafQueue.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/ParentQueue.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacitySchedulerConfiguration.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacitySchedulerContext.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestLeafQueue.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CSQueue.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/common/fica/FiCaSchedulerApp.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestReservations.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestChildQueueOrder.java > CapacityScheduler: Improve reservations > ---------------------------------------- > > Key: YARN-1769 > URL: https://issues.apache.org/jira/browse/YARN-1769 > Project: Hadoop YARN > Issue Type: Improvement > Components: capacityscheduler > Affects Versions: 2.3.0 > Reporter: Thomas Graves > Assignee: Thomas Graves > Fix For: 2.6.0 > > Attachments: YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, > YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, > YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, > YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, > YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, YARN-1769.patch, > YARN-1769.patch > > > Currently the CapacityScheduler uses reservations in order to handle requests > for large containers and the fact there might not currently be enough space > available on a single host. > The current algorithm for reservations is to reserve as many containers as > currently required and then it will start to reserve more above that after a > certain number of re-reservations (currently biased against larger > containers). Anytime it hits the limit of number reserved it stops looking > at any other nodes. This results in potentially missing nodes that have > enough space to fullfill the request. > The other place for improvement is currently reservations count against your > queue capacity. If you have reservations you could hit the various limits > which would then stop you from looking further at that node. > The above 2 cases can cause an application requesting a larger container to > take a long time to gets it resources. > We could improve upon both of those by simply continuing to look at incoming > nodes to see if we could potentially swap out a reservation for an actual > allocation. -- This message was sent by Atlassian JIRA (v6.3.4#6332)