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https://issues.apache.org/jira/browse/YARN-4954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15385594#comment-15385594
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Gergely Novák commented on YARN-4954:
-------------------------------------
This JIRA seems outdated to me: unfortunately I'm not familiar with the latest
developments affecting the YARN reservation system, but it looks like the
MiniYARNCluster is now using hard coded config values for 'detecting' container
memory (NodeManagerHardwareUtils.getContainerMemoryMB()):
{code}
memoryMb = conf.getInt(YarnConfiguration.NM_PMEM_MB,
YarnConfiguration.DEFAULT_NM_PMEM_MB);
{code}
This means that it is irrelevant how much memory is actually available in the
machine, I tested this with VMs containing 6, 4, 3 and 2 GBs of RAM (with
swapping disabled) and on my local machine with 16 GBs: the container memory is
*always* 4096 MBs, and the plan capacity is 4096 * 0.8 * 2 \[total * planAbsCap
* number of node managers\] = 6553 MBs, so the block you quoted works (at least
in my test environments). Also, with fixed container memory the fixed
reservation request memory sizes seem reasonable to me.
[~vinodkv] Can you give me a link to the environment (Jenkins?) where the tests
are consistently failing so that I can have a further analysis?
> TestYarnClient.testReservationAPIs fails on machines with less than 4 GB
> available memory
> -----------------------------------------------------------------------------------------
>
> Key: YARN-4954
> URL: https://issues.apache.org/jira/browse/YARN-4954
> Project: Hadoop YARN
> Issue Type: Test
> Components: test
> Affects Versions: 3.0.0-alpha1
> Reporter: Gergely Novák
> Assignee: Gergely Novák
> Priority: Critical
> Attachments: YARN-4954.001.patch
>
>
> TestYarnClient.testReservationAPIs sometimes fails with this error:
> {noformat}
> java.lang.AssertionError:
> org.apache.hadoop.yarn.server.resourcemanager.reservation.exceptions.PlanningException:
> The request cannot be satisfied
> at
> org.apache.hadoop.yarn.ipc.RPCUtil.getRemoteException(RPCUtil.java:38)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.submitReservation(ClientRMService.java:1254)
> at
> org.apache.hadoop.yarn.api.impl.pb.service.ApplicationClientProtocolPBServiceImpl.submitReservation(ApplicationClientProtocolPBServiceImpl.java:457)
> at
> org.apache.hadoop.yarn.proto.ApplicationClientProtocol$ApplicationClientProtocolService$2.callBlockingMethod(ApplicationClientProtocol.java:515)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:637)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2422)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2418)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1742)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2416)
> Caused by:
> org.apache.hadoop.yarn.server.resourcemanager.reservation.exceptions.PlanningException:
> The request cannot be satisfied
> at
> org.apache.hadoop.yarn.server.resourcemanager.reservation.planning.IterativePlanner.computeJobAllocation(IterativePlanner.java:151)
> at
> org.apache.hadoop.yarn.server.resourcemanager.reservation.planning.PlanningAlgorithm.allocateUser(PlanningAlgorithm.java:64)
> at
> org.apache.hadoop.yarn.server.resourcemanager.reservation.planning.PlanningAlgorithm.createReservation(PlanningAlgorithm.java:140)
> at
> org.apache.hadoop.yarn.server.resourcemanager.reservation.planning.TryManyReservationAgents.createReservation(TryManyReservationAgents.java:55)
> at
> org.apache.hadoop.yarn.server.resourcemanager.reservation.planning.AlignedPlannerWithGreedy.createReservation(AlignedPlannerWithGreedy.java:84)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.submitReservation(ClientRMService.java:1237)
> ... 10 more
> at org.junit.Assert.fail(Assert.java:88)
> at
> org.apache.hadoop.yarn.client.api.impl.TestYarnClient.testReservationAPIs(TestYarnClient.java:1227)
> {noformat}
> This is caused by really not having enough available memory to complete the
> reservation (4 * 1024 MB). In my opinion lowering the required memory (either
> by lowering the number of containers to 2, or the memory to 512 MB) would
> make the test more stable.
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