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https://issues.apache.org/jira/browse/SOLR-12998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18122095#comment-18122095
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Nick Shanin commented on SOLR-12998:
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🤖 AI text below 🤖 (posted on behalf of Nick Shanin)
I opened a PR for this: https://github.com/apache/solr/pull/5010
REQUESTRECOVERY now returns a 503 instead of a 400 when the named core is still
loading, and SyncStrategy retries that exact response up to two more times;
other 503 responses are not retried. Tests cover the 503/400 split and the
retry behaviour, including no retry for a different 503 and consistent Error
propagation.
> Race condition between requery recovery and the core load completing
> --------------------------------------------------------------------
>
> Key: SOLR-12998
> URL: https://issues.apache.org/jira/browse/SOLR-12998
> Project: Solr
> Issue Type: Bug
> Reporter: Varun Thacker
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I started Solr ( 7_6 branch ) using {{bin/solr start -e cloud -noprompt}} and
> indexed 25M documents which amounts to roughly 1GB per replica in raw disk
> space.
> Â
> Whenever I restart the cluster, node2 ( 7574 ) get's these errors in the logs
> which seems to indicate that request recovery is trying to find a core which
> isn't completely loaded yet.
> Â
> {code:java}
> 2018-11-18 21:06:09.845 INFOÂ
> (coreLoadExecutor-9-thread-2-processing-n:192.168.0.7:7574_solr)
> [c:gettingstarted s:shard2 r:core_node8 x:gettingstarted_shard2_replica_n6]
> o.a.s.c.SolrCore [[gettingstarted_shard2_replica_n6] ] Opening new SolrCore
> at
> [/Users/varunthacker/apache-work/lucene-solr/solr/example/cloud/node2/solr/gettingstarted_shard2_replica_n6],
>
> dataDir=[/Users/varunthacker/apache-work/lucene-solr/solr/example/cloud/node2/solr/gettingstarted_shard2_replica_n6/data/]
> ...
> 2018-11-18 21:06:10.501 INFOÂ (qtp690521419-148) [Â Â
> x:gettingstarted_shard2_replica_n6] o.a.s.h.a.CoreAdminOperation It has been
> requested that we recover: core=gettingstarted_shard2_replica_n6
> ...
> 2018-11-18 21:06:10.503 ERROR (qtp690521419-141) [Â Â
> x:gettingstarted_shard1_replica_n1] o.a.s.h.RequestHandlerBase
> org.apache.solr.common.SolrException: Unable to locate core
> gettingstarted_shard1_replica_n1
> Â Â Â Â Â Â Â at
> org.apache.solr.handler.admin.CoreAdminOperation.lambda$static$5(CoreAdminOperation.java:167)
> Â Â Â Â Â Â Â at
> org.apache.solr.handler.admin.CoreAdminOperation.execute(CoreAdminOperation.java:360)
> Â Â Â Â Â Â Â at
> org.apache.solr.handler.admin.CoreAdminHandler$CallInfo.call(CoreAdminHandler.java:395)
> Â Â Â Â Â Â Â at
> org.apache.solr.handler.admin.CoreAdminHandler.handleRequestBody(CoreAdminHandler.java:180)
> ...
> 2018-11-18 21:06:10.503 INFOÂ (qtp690521419-148) [Â Â
> x:gettingstarted_shard2_replica_n6] o.a.s.s.HttpSolrCall [admin] webapp=null
> path=/admin/cores
> params={core=gettingstarted_shard2_replica_n6&action=REQUESTRECOVERY&wt=javabin&version=2}
> status=400 QTime=3
> ... still the core is loading
> 2018-11-18 21:06:10.876 INFOÂ
> (coreLoadExecutor-9-thread-2-processing-n:192.168.0.7:7574_solr)
> [c:gettingstarted s:shard2 r:core_node8 x:gettingstarted_shard2_replica_n6]
> o.a.s.s.SolrIndexSearcher Opening
> [Searcher@2d17168a[gettingstarted_shard2_replica_n6] main]
> ... now done
> 2018-11-18 21:06:10.953 INFOÂ
> (searcherExecutor-10-thread-1-processing-n:192.168.0.7:7574_solr
> x:gettingstarted_shard2_replica_n6 c:gettingstarted s:shard2 r:core_node8)
> [c:gettingstarted s:shard2 r:core_node8 x:gettingstarted_shard2_replica_n6]
> o.a.s.c.SolrCore [gettingstarted_shard2_replica_n6] Registered new searcher
> Searcher@2d17168a[gettingstarted_shard2_replica_n6]
> main{ExitableDirectoryReader(UninvertingDirectoryReader(_49(7.6.0):C2416916/4913:delGen=2
> _a4(7.6.0):C2474322 _71(7.6.0):C2723220 _4k(7.6.0):c111317
> _d7(7.6.0):C2501101 _bt(7.6.0):c91922 _di(7.6.0):c339286 _eb(7.6.0):c163244
> _ds(7.6.0):c92780 _e1(7.6.0):c337329 _em(7.6.0):c360003 _ew(7.6.0):c263533
> _fg(7.6.0):c226118 _f6(7.6.0):c266132 _es(7.6.0):C2361 _f8(7.6.0):C2251
> _ff(7.6.0):C1821 _fh(7.6.0):C20079 _fi(7.6.0):C35733 _fj(7.6.0):C37203
> _fk(7.6.0):C34780 _fl(7.6.0):C262 _fm(7.6.0):C2148 _fn(7.6.0):C2503))}{code}
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