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https://issues.apache.org/jira/browse/SOLR-9867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15987650#comment-15987650
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Mikhail Khludnev commented on SOLR-9867:
----------------------------------------
I've added printing response on core status requests. Here is how race looks
like
{code}
Solr is running on 8983 in standalone mode with status:
{
"solr_home":"/Use..olr/example/techproducts/solr",
"version":"7.0.0-SNAPSHOT eb1671c8f9a472a6ba6ff2516c55110574a64a96 -
khludnevm - 2017-04-27 18:02:58",
"startTime":"2017-04-27T15:09:24.404Z",
"uptime":"0 days, 0 hours, 0 minutes, 9 seconds",
"memory":"35.9 MB (%7.3) of 490.7 MB",
"baseUrl":"http://localhost:8983/solr"}
{code}
here are status responses
{code}
http://localhost:8983/solr/admin/cores?action=STATUS&core=techproducts
{responseHeader={status=0, QTime=2}, initFailures={}, status={techproducts={}}}
http://localhost:8983/solr/admin/cores?action=STATUS&core=techproducts
{responseHeader={status=0, QTime=0}, initFailures={}, status={techproducts={}}}
Creating new core 'techproducts' using command:
http://localhost:8983/solr/admin/cores?action=CREATE&name=techproducts&instanceDir=techproducts
ERROR: Error CREATEing SolrCore 'techproducts': Unable to create core
[techproducts] Caused by: Lock held by this virtual machine:
/Users/khludnevm/lucene-solr/solr/example/techproducts/solr/techproducts/data/index/write.lock
{code}
Here is how it looks like in logs, one core is loading, it responds on STATUS
HttpSolrCall, and recieves core create request from SolrCLI.
{code}
INFO - 2017-04-27 15:09:33.021; [ x:techproducts]
org.apache.solr.schema.IndexSchema; [techproducts] Schema name=example
INFO - 2017-04-27 15:09:34.059; [ ] org.apache.solr.servlet.HttpSolrCall;
[admin] webapp=null path=/admin/info/system params={wt=json} status=0 QTime=103
INFO - 2017-04-27 15:09:34.132; [ ]
org.apache.solr.core.TransientSolrCoreCacheDefault; Allocating transient cache
for 2147483647 transient cores
INFO - 2017-04-27 15:09:34.133; [ ] org.apache.solr.servlet.HttpSolrCall;
[admin] webapp=null path=/admin/cores
params={core=techproducts&action=STATUS&wt=json} status=0 QTime=2
INFO - 2017-04-27 15:09:34.202; [ x:techproducts]
org.apache.solr.rest.RestManager$Registry; Registered ManagedResource impl
org.apache.solr.rest.schema.analysis.ManagedWordSetResource
INFO - 2017-04-27 15:09:34.202; [ ] org.apache.solr.servlet.HttpSolrCall;
[admin] webapp=null path=/admin/info/system params={wt=json} status=0 QTime=61
INFO - 2017-04-27 15:09:34.203; [ x:techproducts]
org.apache.solr.rest.RestManager$Registry; Registered ManagedResource impl
org.apache.solr.rest.schema.analysis.ManagedSynonymFilterFa
INFO - 2017-04-27 15:09:34.215; [ x:techproducts]
org.apache.solr.schema.IndexSchema; Loaded schema example/1.6 with uniqueid
field id
INFO - 2017-04-27 15:09:34.216; [ x:techproducts]
org.apache.solr.rest.RestManager$Registry; Added observer of type
org.apache.solr.rest.schema.analysis.ManagedStopFilterFactory to exi
INFO - 2017-04-27 15:09:34.216; [ x:techproducts]
org.apache.solr.rest.RestManager$Registry; Added observer of type
org.apache.solr.rest.schema.analysis.ManagedSynonymFilterFactory to
INFO - 2017-04-27 15:09:34.270; [ ] org.apache.solr.servlet.HttpSolrCall;
[admin] webapp=null path=/admin/info/system params={wt=json} status=0 QTime=57
INFO - 2017-04-27 15:09:34.282; [ ] org.apache.solr.servlet.HttpSolrCall;
[admin] webapp=null path=/admin/cores
params={core=techproducts&action=STATUS&wt=json} status=0 QTime=0
INFO - 2017-04-27 15:09:34.287; [ ]
org.apache.solr.handler.admin.CoreAdminOperation; core create command
name=techproducts&action=CREATE&instanceDir=techproducts&wt=json
INFO - 2017-04-27 15:09:34.294; [ x:techproducts]
org.apache.solr.core.CoreContainer; Creating SolrCore 'techproducts' using
configuration from instancedir /Users/khl
{code}
> The Solr examples can not always be started after being stopped due to race
> with loading core.
> ----------------------------------------------------------------------------------------------
>
> Key: SOLR-9867
> URL: https://issues.apache.org/jira/browse/SOLR-9867
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mark Miller
> Fix For: 6.6, master (7.0)
>
> Attachments: SOLR-9867.patch, SOLR-9867.patch
>
>
> I'm having trouble when I start up the schemaless example after shutting down.
> I first tracked this down to the fact that the run example tool is getting an
> error when it tries to create the SolrCore (again, it already exists) and so
> it deletes the cores instance dir which leads to tlog and index lock errors
> in Solr.
> The reason it seems to be trying to create the core when it already exists is
> that the run example tool uses a core status call to check existence and
> because the core is loading, we don't consider it as existing. I added a
> check to look for core.properties.
> That seemed to let me start up, but my first requests failed because the core
> was still loading. It appears CoreContainer#getCore is supposed to be
> blocking so you don't have this problem, but there must be an issue, because
> it is not blocking.
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