On 27/07/2021 14:40, Laura Morales wrote:
I can actually confirm that this was happening to me as well on a VM with 4GB
RAM and TDB store (thus not in-memory). As more and more queries were made, RAM
filled up, then the SWAP filled up, and at that point I had to reboot the
machine. My solution was just to restart the server with a cronjob.
It sounds like the heap is too big.
Heap should never be such that swap happens (a general java point, not
related to Jena).
If the heap goes to swap, then a major GC is appalling.
You can setup a small footprint TDB if necessary.
https://jena.apache.org/documentation/tdb/store-parameters.html
How useful that is depends on the amount of data.
Andy
Sent: Tuesday, July 27, 2021 at 3:19 PM
From: "Marco Fiocco" <[email protected]>
To: [email protected]
Subject: In-memory Fuseki keeps growing memory indefinitely even if idle
Hello,
I'm running a in-memory Fuseki 3.16 server and I see that the allocated memory
keeps growing linearly indefinitely even if idle.
Initially I reserved 1GB of memory and I've noticed that the process gets OOM
killed every 2 hours. Now I've allocated 2GB because I've read somewhere that
2GB is the minimum for Java heaps. Is that true?
I'm waiting to see if it will get again.
Is this a bug or there is a better way to config it?
My Fuseki config is:
@prefix fuseki: <http://jena.apache.org/fuseki#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix tdb: <http://jena.hpl.hp.com/2008/tdb#> .
@prefix ja: <http://jena.hpl.hp.com/2005/11/Assembler#> .
@prefix : <#> .
[] rdf:type fuseki:Server .
<#service> rdf:type fuseki:Service ;
rdfs:label "Dataset with SHACL validation" ;
fuseki:name "ds" ;
# See the endpoint url in
build.gradle
fuseki:serviceReadWriteGraphStore "data" ;
# SPARQL Graph store protocol (read
and write)
fuseki:endpoint [ fuseki:operation fuseki:query ; fuseki:name
"sparql" ] ; # SPARQL query service
fuseki:endpoint [ fuseki:operation fuseki:shacl ; fuseki:name
"shacl" ] ; # SHACL query service
fuseki:dataset <#dataset> .
## In memory TDB with union graph.
<#dataset> rdf:type tdb:DatasetTDB ;
tdb:location "--mem--" ;
# Query timeout on this dataset (1s, 1000 milliseconds)
ja:context [ ja:cxtName "arq:queryTimeout" ; ja:cxtValue "1000" ] ;
# Make the default graph be the union of all named graphs.
tdb:unionDefaultGraph true .
Thanks
Marco
