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From "Mukund Madhugiri (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3116) Investigate whether the array in the JobInProgress that holds TIP references can be removed
Date Sat, 07 Jun 2008 01:26:46 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mukund Madhugiri updated HADOOP-3116:
-------------------------------------

    Fix Version/s:     (was: 0.18.0)

> Investigate whether the array in the JobInProgress that holds TIP references can be removed
> -------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3116
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3116
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.17.0
>            Reporter: Devaraj Das
>
> The array, in JobInProgress, that holds the references to TIPs is required now only to
serve the clients (web UI via JSPs and JobClient APIs, that traverse the array and create
the output). The array can now be removed since HADOOP-2119 introduces some datastructures
for running/non-running TIPs and we could probably add some more if required (e.g., for completed
TIPs). That way, we will gain when we have large jobs (many tasks) in the sense that we don't
have to go through the big array every time a client request is made. We could instead iterate
over the datastructures. Also, we should do these traversals without locking the JobTracker
to avoid cases where long traversal leads to loss of heartbeats, etc. Some staleness at the
client side (in favor of improving the JobTracker's performance) is probably okay.

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