[jira] [Commented] (TEZ-4097) Report localHostname in Fetcher and FetcherOrderedGrouped failure log messages

["László Bodor (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-4097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17048608#comment-17048608 ] 

László Bodor commented on TEZ-4097:
-----------------------------------

thanks for the review [~ashutoshc], pushed to master

> Report localHostname in Fetcher and FetcherOrderedGrouped failure log messages
> ------------------------------------------------------------------------------
>
>                 Key: TEZ-4097
>                 URL: https://issues.apache.org/jira/browse/TEZ-4097
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: László Bodor
>            Assignee: László Bodor
>            Priority: Minor
>             Fix For: 0.10.0
>
>         Attachments: TEZ-4097.01.patch
>
>
> Currently, a fetch failure is reported like this:
> {code}
> 2019-11-05 02:50:35,972 [WARN] [Fetcher_B {Map_4} #1] |shuffle.Fetcher|: Fetch Failure from host while connecting: other_host, attempt: InputAttemptIdentifier [inputIdentifier=1, attemptNumber=0, pathComponent=attempt_1572936153637_0005_1_00_000000_0_10003, spillType=0, spillId=-1] Informing ShuffleManager:
> java.net.SocketTimeoutException: Read timed out
> ...
> {code}
> For debugging network/ssl/etc. issues on cluster, it would be convenient to see the local host's name in these messages (which is present in the fetcher as localHostname property), as in the logs collected by yarn cli, it's not obvious for the first sight.
> The same applies to FetcherOrderedGrouped, which reports something like:
> {code}
> 2019-11-05 03:13:11,046 [WARN] [Fetcher_O {Map_1} #0] |orderedgrouped.FetcherOrderedGrouped|: Failed to verify reply after connecting to other_host:13562 with 1 inputs pending
> javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> {code}



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