kiarash created SOLR-12381:
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Summary: facet query causes down replicas
Key: SOLR-12381
URL: https://issues.apache.org/jira/browse/SOLR-12381
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 6.6.1
Reporter: kiarash
Cluster description:
I have a solr cluster with 3 nodes(node1, node2, node3).
Each node has:
30 GB memory.
3 TB SATA Disk
My cluster involves 5 collections which contain more than a billion document.
I have a collection(news_archive collection) which contain 30 million document.
This collection is divided into 3 shards which each of them contains 10 million
document and occupies 100GB on the Disk. Each of the shards has 3 replicas.
Each of the cluster nodes contains one of the replicas of each shard. in fact,
the nodes are similar, i.e:
node1 contains:
shard1_replica1
shard2_replica1
shard3_replica1
node2 contains:
shard1_replica2
shard2_replica2
shard3_replica2
node3 contains:
shard1_replica3
shard2_replica3
shard3_replica3
Problem description:
when I run a heavy facet query,
such as
http://Node1IP:xxxx/solr/news_archive/select?q=*:*&fq=pubDate:[2018-1-18T12:06:57Z%20TO%202018-4-18T12:06:57Z]&facet.field=ngram_content&facet=true&facet.mincount=1&facet.limit=2000&rows=0&wt=json,
the solr instances are killed by the OOM killer in almost all of the nodes.
I found the bellow log in
solr/logs/solr_oom_killer-xxxx-2018-05-21_19_17_41.log in each of the solr
instances,
"Running OOM killer script for process 2766 for Solr on port xxxx
Killed process 2766"
It seems that the query is routed into different nodes of the clusters and with
attention to exhaustively use of memory which is caused by the query the solr
instances are killed by OOM Killer.
despite the fact that how the query is memory demanding, I think the cluster's
nodes should be preserved from being killed by any read query.
for example by limiting the amount of memory which can be used by any query.
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