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From Jack Krupansky <>
Subject Re: unmerged index segments
Date Mon, 25 Jan 2016 21:39:09 GMT
What exacting are you merge policy settings in solrconfig? They control
when the background merges will be performed. Sometimes they do need to be

-- Jack Krupansky

On Mon, Jan 25, 2016 at 1:50 PM, James Mason <>

> Hi,
> I’ve have a large index that has been added to over several years, and
> I’ve discovered that I have many segments that haven’t been updated for
> well over a year, even though I’m adding, updating and deleting records
> daily. My five largest segments all haven’t been updated for over a year.
> Meanwhile, the number of segments I have keeps on increasing, and I have
> hundreds of segment files that don’t seem to be getting merged past a
> certain size (e.g. the largest is 2Gb but my older segments are over 100Gb).
> My understanding was that background merges should be merging these older
> segments with newer data over time, but this doesn’t seem to be the case.
> I’m using Solr 4.9, but I was using an older version at the time that
> these ‘older’ segments were created.
> Any help on suggestions of what’s happening would be very much
> appreciated. And also any suggestion on how I can monitor what’s happening
> with the background merges.
> Thanks,
> James

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