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From "Shawn Heisey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-656) better error message when "data/index" is completely empty
Date Mon, 07 Jan 2013 17:10:12 GMT

    [ https://issues.apache.org/jira/browse/SOLR-656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546044#comment-13546044
] 

Shawn Heisey commented on SOLR-656:
-----------------------------------

Solr 3.6 still blows up (saying it can't find the segments file) when index exists but is
empty -- I was helping someone in #solr yesterday and discovered that.  Solr 4.1-SNAPSHOT
(checked out sometime yesterday) is perfectly fine with an empty index directory, it happily
makes a new index and proceeds without a problem.  My patch is unnecessary on 4x, all that
remains for this issue is to decide whether the 3.6 behavior is considered a bug.

I am still curious whether adding isFSBased() to DirectoryFactory is something that holds
interest.  The patch is ready - all that you'd have to do is remove the part that wasn't necessary
for this issue.

                
> better error message when "data/index" is completely empty
> ----------------------------------------------------------
>
>                 Key: SOLR-656
>                 URL: https://issues.apache.org/jira/browse/SOLR-656
>             Project: Solr
>          Issue Type: Wish
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>             Fix For: 4.2, 5.0
>
>         Attachments: SOLR-656.patch, SOLR-656-rmdir.patch, SOLR-656-rmdir.patch
>
>
> Solr's normal behavior is to create an "index" dire in the dataDir if one does not already
exist, but if "index" does exist it is used as is, warts and all ... if the index is corrupt
in some way, and Solr can't create an IndexWriter or IndexReader that error is propagated
up to the user.
> I don't think this should change: Solr shouldn't attempt to do anything special if there
is a low level problem with the index, but something that i've seen happen more then a few
times is that people unwittingly "rm index/*" when they should "run -r index" and as a result
Solr+Lucene gives them an error instead of just giving them an empty index
> when checking if an existing index dir exists, it would probably be worth while to add
a little one line sanity test that it contains some files, and log a warning.

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