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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18786) FileNotFoundException should not be silently handled for primary region replicas
Date Mon, 11 Sep 2017 23:28:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162225#comment-16162225
] 

Duo Zhang commented on HBASE-18786:
-----------------------------------

For me, FNFE should not happen and if it happens then there must be serious bugs that may
cause data loss.

That's why I introduce a config, the intention is to disable the feature as we used to always
handle it silently...

On a mobile phone so can not find the related issues right now, will link them here later.
And I'm +1 on do not handle FNFE in our common code path.

Thanks.

> FileNotFoundException should not be silently handled for primary region replicas
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-18786
>                 URL: https://issues.apache.org/jira/browse/HBASE-18786
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>            Reporter: Ashu Pachauri
>             Fix For: 1.3.2
>
>
> This is a follow up for HBASE-18186.
> FileNotFoundException while scanning from a primary region replica can be indicative
of a more severe problem. Handling them silently can cause many underlying issues go undetected.
We should either
> 1. Hard fail the regionserver if there is a FNFE on a primary region replica, OR
> 2. Report these exceptions as some region / server level metric so that these can be
proactively investigated.



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