bq: Actually there are only 2 tlog files but each java process has
handles open to tlog.
I'm a little confused by this. Each core in each Solr JVM should have
a handle to it's _own_ tlog open. So if JVM1 has 10 cores (replicas),
I'd expect 10 different tlogs to be open, one for each core. But I
don't expect two processes to have a handle open to the _same_ tlog
unless something's horribly wrong.
And as Emir and Alessandro point out, every hard commit of any flavor
should close the current tlog (for the replica/core) and open a new
one. Soft commits have no effect.
Oh, and please don't expungeDeletes or optimize if you can possibly
help it, there'll be a blog coming soon on why this is A Bad Idea
unless you have a pattern where you periodically (I'm thinking daily)
update your index and optimize as part of your process.
Best,
Erick
P.S. The reference guide is freely editable. Well, actually they're
just files in asciidoc format. It'd be great if you wanted to edit
them. I use Atom to edit them as it's free. If you do feel moved to do
this, just raise a JIRA and add the diff as a patch. There's also an
IntelliJ plugin that will do. I'm heavily editing the Near Real Time
page...
On Mon, Oct 9, 2017 at 5:35 AM, Bernd Fehling
<bernd.fehl...@uni-bielefeld.de> wrote:
> Thanks a lot Alessandro and Emir.
>
> Am 09.10.2017 um 13:40 schrieb alessandro.benedetti:
>> In addition to what Emir mentioned, when Solr opens a new Transaction Log
>> file it will delete the older ones up to some conditions :
>> keep at least N number of records [1] and max K number of files[2].
>> N is specified in the solrconfig.xml ( in the update handler section) and
>> can be documents related or files related or both.
>> So , potentially it could delete no one.
>>
>> This blog from Erick is quite explicative[3] .
>> If you like to take a look to the code, this class should help[4]
>>
>>
>>
>> [1] <str name="numRecordsToKeep">${solr.ulog.numRecordsToKeep:100}</str>
>> [2] <str name="maxNumLogsToKeep">${solr.ulog.maxNumLogsToKeep:10}</str>
>> [3]
>> https://lucidworks.com/2013/08/23/understanding-transaction-logs-softcommit-and-commit-in-sorlcloud/
>> [4] org.apache.solr.update.UpdateLog
>>
>>
>>
>>
>> -----
>> ---------------
>> Alessandro Benedetti
>> Search Consultant, R&D Software Engineer, Director
>> Sease Ltd. - www.sease.io
>> --
>> Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
>>
