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From Thomas Scheffler <>
Subject Re: Memory Leak in 7.3 to 7.4
Date Thu, 02 Aug 2018 11:30:39 GMT

my final verdict is the upgrade to Tika 1.17. If I downgrade the libraries just for tika back
to 1.16 and keep the rest of SOLR 7.4.0 the heap usage after about 85 % of the index process
and manual trigger of the garbage collector is about 60-70 MB (That low!!!)

My problem now is that we have several setups that triggers this reliably but there is no
simple test case that „fails“ if Tika 1.17 or 1.18 is used. I also do not know if the
error is inside Tika or inside the glue code that makes Tika usable in SOLR.

Should I file an issue for this?

kind regards,


> Am 02.08.2018 um 12:06 schrieb Thomas Scheffler <>:
> Hi,
> we noticed a memory leak in a rather small setup. 40.000 metadata documents with nearly
as much files that have „literal.*“ fields with it. While 7.2.1 has brought some tika
issues (due to a beta version) the real problems started to appear with version 7.3.0 which
are currently unresolved in 7.4.0. Memory consumption is out-of-roof. Where previously 512MB
heap was enough, now 6G aren’t enough to index all files.
> I am now to a point where I can track this down to the libraries in solr-7.4.0/contrib/extraction/lib/.
If I replace them all by the libraries shipped with 7.2.1 the problem disappears. As most
files are PDF documents I tried updating pdfbox to 2.0.11 and tika to 1.18 with no solution
to the problem. I will next try to downgrade these single libraries back to 2.0.6 and 1.16
to see if these are the source of the memory leak.
> In the mean time I would like to know if anybody else experienced the same problems?
> kind regards,
> Thomas

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