[ https://issues.apache.org/jira/browse/MAPREDUCE-3162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13124701#comment-13124701 ]
Todd Lipcon commented on MAPREDUCE-3162: ---------------------------------------- bq. More of the init used to be per-application, before changing the localization to be per-container The issue that got me looking at this code was MAPREDUCE-3159 -- a place where the per-application action of rming the appcachedir was actually being run on every container. But it makes sense that we can avoid the shell-out to the localizer on every container initialization - it's not super expensive but the fork isn't free either. In the case that a container has no new resources associated with it, we shouldn't need to spawn one, right? > Separate application-init and container-init event types in NM's > ApplicationImpl FSM > ------------------------------------------------------------------------------------ > > Key: MAPREDUCE-3162 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3162 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Affects Versions: 0.23.0 > Reporter: Todd Lipcon > Assignee: Todd Lipcon > Priority: Minor > Attachments: mr-3162.txt > > > Currently, the ApplicationImpl receives an INIT_APPLICATION event on every > container initialization. Only on the first one does it really mean to init > the application, whereas all subsequent events are for specific containers. > This JIRA is to separate the events into INIT_APPLICATION, sent once and only > once per application, and INIT_CONTAINER, which is sent for every container. > The first container sends INIT_APPLICATION followed by INIT_CONTAINER. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira