[jira] [Commented] (LUCENE-5857) make genLookaheadCountLimit configurable, add genLookbackCountLimit parameter

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15094546#comment-15094546 ] 

ASF GitHub Bot commented on LUCENE-5857:
----------------------------------------

Github user cpoerschke closed the pull request at:

    https://github.com/apache/lucene-solr/pull/76


> make genLookaheadCountLimit configurable, add genLookbackCountLimit parameter
> -----------------------------------------------------------------------------
>
>                 Key: LUCENE-5857
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5857
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Christine Poerschke
>
> The problem we saw was that an error-in-final-commit during solr-shutdown led to a corrupted segments_.... file which prevented subsequent solr-start, details below.
> this change:
> * adds genLookbackCountLimit similar to the existing genLookaheadCountLimit
> * makes both parameters configurable (initial values defaulted to existing behaviour)
> error-in-final-commit result:
> * segments_2fi5 file present and zero-bytes long (https://issues.apache.org/jira/i#browse/SOLR-6296 concerns root cause)
> * segments_2fi4 file absent on disk (speculation: 2fi4 was result of in-memory segment merging)
> * segments_2fi3 file present and usable (but not found by existing looking-logic)
> * segments.gen file referenced 2fi3



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