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Posted to yarn-issues@hadoop.apache.org by "Peter Bacsko (JIRA)" <ji...@apache.org> on 2019/07/10 14:40:01 UTC
[jira] [Assigned] (YARN-9011) Race condition during decommissioning
[ https://issues.apache.org/jira/browse/YARN-9011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Peter Bacsko reassigned YARN-9011:
----------------------------------
Assignee: Peter Bacsko (was: Antal Bálint Steinbach)
> Race condition during decommissioning
> -------------------------------------
>
> Key: YARN-9011
> URL: https://issues.apache.org/jira/browse/YARN-9011
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 3.1.1
> Reporter: Peter Bacsko
> Assignee: Peter Bacsko
> Priority: Major
>
> During internal testing, we found a nasty race condition which occurs during decommissioning.
> Node manager, incorrect behaviour:
> {noformat}
> 2018-06-18 21:00:17,634 WARN org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl: Received SHUTDOWN signal from Resourcemanager as part of heartbeat, hence shutting down.
> 2018-06-18 21:00:17,634 WARN org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl: Message from ResourceManager: Disallowed NodeManager nodeId: node-6.hostname.com:8041 hostname:node-6.hostname.com
> {noformat}
> Node manager, expected behaviour:
> {noformat}
> 2018-06-18 21:07:37,377 WARN org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl: Received SHUTDOWN signal from Resourcemanager as part of heartbeat, hence shutting down.
> 2018-06-18 21:07:37,377 WARN org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl: Message from ResourceManager: DECOMMISSIONING node-6.hostname.com:8041 is ready to be decommissioned
> {noformat}
> Note the two different messages from the RM ("Disallowed NodeManager" vs "DECOMMISSIONING"). The problem is that {{ResourceTrackerService}} can see an inconsistent state of nodes while they're being updated:
> {noformat}
> 2018-06-18 21:00:17,575 INFO org.apache.hadoop.yarn.server.resourcemanager.NodesListManager: hostsReader include:{172.26.12.198,node-7.hostname.com,node-2.hostname.com,node-5.hostname.com,172.26.8.205,node-8.hostname.com,172.26.23.76,172.26.22.223,node-6.hostname.com,172.26.9.218,node-4.hostname.com,node-3.hostname.com,172.26.13.167,node-9.hostname.com,172.26.21.221,172.26.10.219} exclude:{node-6.hostname.com}
> 2018-06-18 21:00:17,575 INFO org.apache.hadoop.yarn.server.resourcemanager.NodesListManager: Gracefully decommission node node-6.hostname.com:8041 with state RUNNING
> 2018-06-18 21:00:17,575 INFO org.apache.hadoop.yarn.server.resourcemanager.ResourceTrackerService: Disallowed NodeManager nodeId: node-6.hostname.com:8041 node: node-6.hostname.com
> 2018-06-18 21:00:17,576 INFO org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl: Put Node node-6.hostname.com:8041 in DECOMMISSIONING.
> 2018-06-18 21:00:17,575 INFO org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=yarn IP=172.26.22.115 OPERATION=refreshNodes TARGET=AdminService RESULT=SUCCESS
> 2018-06-18 21:00:17,577 INFO org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl: Preserve original total capability: <memory:8192, vCores:8>
> 2018-06-18 21:00:17,577 INFO org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl: node-6.hostname.com:8041 Node Transitioned from RUNNING to DECOMMISSIONING
> {noformat}
> When the decommissioning succeeds, there is no output logged from {{ResourceTrackerService}}.
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