[
https://issues.apache.org/jira/browse/TEZ-2618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15440024#comment-15440024
]
Hitesh Shah commented on TEZ-2618:
----------------------------------
[~saikatr] [~jlowe] Mind adding more details on this? I have the same question
on why local disk can fail but http to the same data can succeed. Is this even
a problem to try solving?
> In Ordered Fetcher, if Local Fetch fails, fallback and try http Fetch before
> returning a failure
> ------------------------------------------------------------------------------------------------
>
> Key: TEZ-2618
> URL: https://issues.apache.org/jira/browse/TEZ-2618
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Saikat
> Assignee: Saikat
> Attachments: TEZ-2618.1.patch, TEZ-2618.patch
>
>
> In setupLocalDiskFetch() method[this is invoked when the fetcher is in the
> same host as the target map host], first try to check if we can open the
> target spill file using the localDirAllocator.getLocalPathToRead(). The
> localDirAllocator searches through the list of configured dirs for the file.
> In disk full scenarios, if the path is not found, fetcher should to try an
> http fetch.
> proposed solution:
> in local fetch mode, the fetcher should first try getLocalPathToRead() for
> all the pending maps. and So local fetch gets divided into 2 stages: first
> the maps for which path was found via LocalDirAllocator and second construct
> a http fallback fetch list for the maps which couldnt be found via
> LocalDirAllocator.getLocalPathToRead() and do an http fetch.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
