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From "kowsik (JIRA)" <j...@apache.org>
Subject [jira] Created: (COUCHDB-1093) Exceptions related to _changes + compact
Date Fri, 18 Mar 2011 21:16:29 GMT
Exceptions related to _changes + compact
----------------------------------------

                 Key: COUCHDB-1093
                 URL: https://issues.apache.org/jira/browse/COUCHDB-1093
             Project: CouchDB
          Issue Type: Bug
          Components: Database Core
    Affects Versions: 1.0.2
         Environment: I don't believe this is OS and/or hardware elated, but I'm running on
a redhat 32-bit linux kernel
            Reporter: kowsik


>From the last thread on the dev mailing list:

On Fri, Mar 18, 2011 at 10:54 AM, Filipe David Manana <fdmanana@apache.org> wrote:
> Ah,
>
> I think the issue is while we are folding the by sequence btree, we
> are not checking if the database file changed. So if compaction
> finishes before finishing the btree fold, we reach that error.
> I can't see right now any other situation, involving _changes, that
> might cause that issue.
>
>
> On Fri, Mar 18, 2011 at 5:40 PM, kowsik <kowsik@gmail.com> wrote:
>> Been seeing this on our production CouchDB's (1.0.2) sporadically. We
>> are using the _changes feed, background view indexing and automatic
>> compaction.
>>
>> Uncaught error in HTTP request: {exit,
>>                                 {noproc,
>>                                  {gen_server,call,
>>                                   [<0.1478.0>,
>>                                    {pread_iolist,290916},
>>                                    infinity]}}}
>>
>>  Stacktrace: [{gen_server,call,3},
>>             {couch_file,pread_iolist,2},
>>             {couch_file,pread_binary,2},
>>             {couch_file,pread_term,2},
>>             {couch_db,make_doc,5},
>>             {couch_db,open_doc_int,3},
>>             {couch_db,open_doc,3},
>>             {couch_changes,'-make_filter_fun/4-lc$^4/1-3-',2}]
>>
>> Not reproducible yet, but it seems compacting while there are active
>> _changes listeners seems to trigger this. After the exception the
>> _changes listeners are disconnected which then connect back and
>> everything goes back to normal. beam itself holds up, though last
>> night it terminated with no logs, nothing. Just poof. Any ideas?
>>
>> Thanks,
>>
>> K.
>> ---
>> http://blitz.io
>> http://twitter.com/pcapr


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