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From "Doroszlai, Attila (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-18569) Execute topology tasks in parallel by hosts
Date Fri, 11 Nov 2016 12:20:58 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-18569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15656948#comment-15656948
] 

Doroszlai, Attila commented on AMBARI-18569:
--------------------------------------------

[Unit test failure|https://builds.apache.org/job/Ambari-trunk-Commit/5989/testReport/] in
{{ServicePropertiesTest.validatePropertySchemaOfServiceXMLs}} is unrelated to this change.

> Execute topology tasks in parallel by hosts
> -------------------------------------------
>
>                 Key: AMBARI-18569
>                 URL: https://issues.apache.org/jira/browse/AMBARI-18569
>             Project: Ambari
>          Issue Type: Task
>          Components: ambari-server
>    Affects Versions: 2.4.0
>            Reporter: Doroszlai, Attila
>            Assignee: Doroszlai, Attila
>             Fix For: 3.0.0, 2.5.0
>
>         Attachments: AMBARI-18569-branch-2.5.patch, AMBARI-18569.patch
>
>
> Currently when a cluster is created using Blueprints, {{PersistHostResourcesTask}}, {{RegisterWithConfigGroupTask}},
{{InstallHostTask}} and {{StartHostTask}} topology tasks are created in this order for each
host. These tasks are then executed by a single-threaded executor {{TopologyManager.executor}}
as hosts are being assigned to the cluster.
> Since {{TopologyManager}} is singleton, this leads to sequential execution of topology
tasks on a single thread. The execution of the each individual topology task involves db operations
under the hood. If for any reason there is some latency introduced by the db operations (e.g.
the db server is remote instead of local) than this latency builds up a considerable delay
if there are many hosts to execute topology tasks for.  Executing the topology tasks in parallel
would reduce the delay in this case.
> Topology tasks for a host must be executed in order, but tasks that belong to different
hosts can be executed concurrently.  E.g. the  {{PersistHostResourcesTask}}, {{RegisterWithConfigGroupTask}},
{{InstallHostTask}} and {{StartHostTask}} topology tasks would be executed sequentially by
one thread for host1 and by another thread for host2.



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