Hoss Man created SOLR-12021:
-------------------------------
Summary: Utils.fromJSONResource(...) and
ValidatingJsonMap.parse(...) open (resourse) InputStreams they don't close
Key: SOLR-12021
URL: https://issues.apache.org/jira/browse/SOLR-12021
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Hoss Man
Assignee: Hoss Man
A recurring theme that pops up now and then in non-reproducible test failures
is for an error like this to show up in the log files when a core/collection is
being created...
{noformat}
[junit4] 2> 674805 ERROR (qtp1337497394-5597) [n:127.0.0.1:55380_np_zxw
c:collection2 s:shard6 x:collection2_shard6_replica_n29]
o.a.s.h.RequestHandlerBase org.apache.solr.common.SolrException: Error
CREATEing SolrCore 'collection2_shard6_replica_n29': Unable to create core
[collection2_shard6_replica_n29] Caused by: invalid API spec:
apispec/core.config.Commands.json
...
[junit4] 2> Caused by: java.lang.RuntimeException: invalid API spec:
apispec/core.config.Commands.json
[junit4] 2> at
org.apache.solr.common.util.ValidatingJsonMap.parse(ValidatingJsonMap.java:318)
[junit4] 2> at
org.apache.solr.common.util.Utils.lambda$getSpec$0(Utils.java:427)
[junit4] 2> at org.apache.solr.api.Api.getSpec(Api.java:65)
[junit4] 2> at org.apache.solr.api.ApiBag.register(ApiBag.java:73)
[junit4] 2> at
org.apache.solr.core.PluginBag.put(PluginBag.java:217)
[junit4] 2> at
org.apache.solr.core.PluginBag.init(PluginBag.java:274)
[junit4] 2> at
org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:130)
[junit4] 2> at
org.apache.solr.core.SolrCore.<init>(SolrCore.java:966)
{noformat}
I _believe_ that the root cause of these types of failures is that these API
spec files are being loaded with
{{ValidatingJsonMap.class.getClassLoader().getResourceAsStream(resourceName)}}
-- but nothing is ever closing the stream, so it can eventually (depending on
what test classes run in each JVM and how many files they try to open like
this) cause the JVM to hit the ulimit for open file handles -- but that
specific cause of the failure is never reported, because
{{ClassLoader.getResourseAsStream(...)}} is explicity designed to swallow any
IOExceptions encountered and just returns "null" (which triggers the "invalid
API spec: " thrown by ValidatingJsonMap)
----
{{ValidatingJsonMap.parse(...)}} and the very similarly looking
{{Utils.fromJSONResource(...)}} should be modified to:
* ensure they always close the streams they open
* use {{ClassLoader.getResource()}} + {{URL.openConnection()}} so that they can
properly log if/when an underlying IOException occurs w/details
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