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From Timothy Springsteen <timothy.springst...@gm.com>
Subject RE: [EXTERNAL] Re: [CDCR]Unable to locate core
Date Sat, 02 Feb 2019 21:49:45 GMT
Thank you for the reply. Sorry I did not include more information in the first post.

So maybe there's some confusion here from my end. So both the target and source clusters are
running in cloud mode. So I think you're correct that it is a different issue. So it looks
like the source leader to target leader is successful but the target leader is then unsuccessful
in replicating to its followers.

The "unable to locate core" message is originally coming from the target cluster.
Here are the logs being generated from the source for reference:
2019-02-02 20:10:19.551 INFO  (cdcr-bootstrap-status-81-thread-1-processing-n:sourcehost001.com:30100_solr
x:testcollection_shard3_replica_n10 c:testcollection s:shard3 r:core_node12) [c:testcollection
s:shard3 r:core_node12 x:testcollection_shard3_replica_n10] o.a.s.h.CdcrReplicatorManager
CDCR bootstrap successful in 3 seconds
2019-02-02 20:10:19.564 INFO  (cdcr-bootstrap-status-81-thread-1-processing-n:sourcehost001.com:30100_solr
x:testcollection_shard3_replica_n10 c:testcollection s:shard3 r:core_node12) [c:testcollection
s:shard3 r:core_node12 x:testcollection_shard3_replica_n10] o.a.s.h.CdcrReplicatorManager
Create new update log reader for target testcollection with checkpoint 1624389130873995265
@ testcollection:shard3
2019-02-02 20:10:19.568 ERROR (cdcr-bootstrap-status-81-thread-1-processing-n:sourcehost001.com:30100_solr
x:testcollection_shard3_replica_n10 c:testcollection s:shard3 r:core_node12) [c:testcollection
s:shard3 r:core_node12 x:testcollection_shard3_replica_n10] o.a.s.h.CdcrReplicatorManager
Unable to bootstrap the target collection testcollection shard: shard3
org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at
http://targethost001.com:30100/solr: Unable to locate core testcollection_shard2_replica_n4
        at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:643)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:255)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:244)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.LBHttpSolrClient.doRequest(LBHttpSolrClient.java:483)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.LBHttpSolrClient.request(LBHttpSolrClient.java:413)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.CloudSolrClient.sendRequest(CloudSolrClient.java:1107)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.CloudSolrClient.requestWithRetryOnStaleState(CloudSolrClient.java:884)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.CloudSolrClient.request(CloudSolrClient.java:817)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.SolrClient.request(SolrClient.java:1219) ~[solr-solrj-7.5.0.jar:7.5.0
b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18 13:07:58]
        at org.apache.solr.handler.CdcrReplicatorManager.sendRequestRecoveryToFollower(CdcrReplicatorManager.java:439)
~[solr-core-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:55]
        at org.apache.solr.handler.CdcrReplicatorManager.sendRequestRecoveryToFollowers(CdcrReplicatorManager.java:428)
~[solr-core-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:55]
        at org.apache.solr.handler.CdcrReplicatorManager.access$300(CdcrReplicatorManager.java:63)
~[solr-core-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:55]
        at org.apache.solr.handler.CdcrReplicatorManager$BootstrapStatusRunnable.run(CdcrReplicatorManager.java:306)
~[solr-core-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:55]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_192]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_192]
        at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:209)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_192]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_192]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_192]
2019-02-02 20:10:19.602 INFO  (cdcr-bootstrap-status-86-thread-1) [   ] o.a.s.h.CdcrReplicatorManager
CDCR bootstrap successful in 3 seconds
2019-02-02 20:10:19.608 INFO  (cdcr-bootstrap-status-86-thread-1) [   ] o.a.s.h.CdcrReplicatorManager
Create new update log reader for target testcollection with checkpoint 1624389130873995265
@ testcollection:shard2
2019-02-02 20:10:19.610 ERROR (cdcr-bootstrap-status-86-thread-1) [   ] o.a.s.h.CdcrReplicatorManager
Unable to bootstrap the target collection testcollection shard: shard2
org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at
http://targethost001.com:30100/solr: Unable to locate core testcollection_shard2_replica_n4
        at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:643)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:255)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:244)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.LBHttpSolrClient.doRequest(LBHttpSolrClient.java:483)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.LBHttpSolrClient.request(LBHttpSolrClient.java:413)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.CloudSolrClient.sendRequest(CloudSolrClient.java:1107)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.CloudSolrClient.requestWithRetryOnStaleState(CloudSolrClient.java:884)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.impl.CloudSolrClient.request(CloudSolrClient.java:817)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at org.apache.solr.client.solrj.SolrClient.request(SolrClient.java:1219) ~[solr-solrj-7.5.0.jar:7.5.0
b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18 13:07:58]
        at org.apache.solr.handler.CdcrReplicatorManager.sendRequestRecoveryToFollower(CdcrReplicatorManager.java:439)
~[solr-core-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:55]
        at org.apache.solr.handler.CdcrReplicatorManager.sendRequestRecoveryToFollowers(CdcrReplicatorManager.java:428)
~[solr-core-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:55]
        at org.apache.solr.handler.CdcrReplicatorManager.access$300(CdcrReplicatorManager.java:63)
~[solr-core-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:55]
        at org.apache.solr.handler.CdcrReplicatorManager$BootstrapStatusRunnable.run(CdcrReplicatorManager.java:306)
~[solr-core-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:55]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_192]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_192]
        at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:209)
~[solr-solrj-7.5.0.jar:7.5.0 b5bf70b7e32d7ddd9742cc821d471c5fabd4e3df - jimczi - 2018-09-18
13:07:58]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_192]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_192]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_192]


Here are the logs from the target:
2019-02-02 20:10:19.566 INFO  (qtp1571967156-14) [   x:testcollection_shard2_replica_n4] o.a.s.h.a.CoreAdminOperation
It has been requested that we recover: core=testcollection_shard2_replica_n4
2019-02-02 20:10:19.567 ERROR (qtp1571967156-14) [   x:testcollection_shard2_replica_n4] o.a.s.h.RequestHandlerBase
org.apache.solr.common.SolrException: Unable to locate core testcollection_shard2_replica_n4
        at org.apache.solr.handler.admin.CoreAdminOperation.lambda$static$5(CoreAdminOperation.java:167)
        at org.apache.solr.handler.admin.CoreAdminOperation.execute(CoreAdminOperation.java:360)
        at org.apache.solr.handler.admin.CoreAdminHandler$CallInfo.call(CoreAdminHandler.java:395)
        at org.apache.solr.handler.admin.CoreAdminHandler.handleRequestBody(CoreAdminHandler.java:180)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
        at org.apache.solr.servlet.HttpSolrCall.handleAdmin(HttpSolrCall.java:734)
        at org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:715)
        at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:496)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219)
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:531)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)
        at java.lang.Thread.run(Thread.java:748)

2019-02-02 20:10:19.567 INFO  (qtp1571967156-14) [   x:testcollection_shard2_replica_n4] o.a.s.s.HttpSolrCall
[admin] webapp=null path=/admin/cores params={core=testcollection_shard2_replica_n4&action=REQUESTRECOVERY&wt=javabin&version=2}
status=400 QTime=0
2019-02-02 20:10:19.607 INFO  (qtp1571967156-133) [c:testcollection s:shard1 r:core_node5
x:testcollection_shard1_replica_n2] o.a.s.c.S.Request [testcollection_shard1_replica_n2] 
webapp=/solr path=/cdcr params={_stateVer_=testcollection:6&action=COLLECTIONCHECKPOINT&wt=javabin&version=2}
status=0 QTime=4
2019-02-02 20:10:19.609 INFO  (qtp1571967156-14) [   x:testcollection_shard2_replica_n4] o.a.s.h.a.CoreAdminOperation
It has been requested that we recover: core=testcollection_shard2_replica_n4
2019-02-02 20:10:19.609 ERROR (qtp1571967156-14) [   x:testcollection_shard2_replica_n4] o.a.s.h.RequestHandlerBase
org.apache.solr.common.SolrException: Unable to locate core testcollection_shard2_replica_n4
        at org.apache.solr.handler.admin.CoreAdminOperation.lambda$static$5(CoreAdminOperation.java:167)
        at org.apache.solr.handler.admin.CoreAdminOperation.execute(CoreAdminOperation.java:360)
        at org.apache.solr.handler.admin.CoreAdminHandler$CallInfo.call(CoreAdminHandler.java:395)
        at org.apache.solr.handler.admin.CoreAdminHandler.handleRequestBody(CoreAdminHandler.java:180)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
        at org.apache.solr.servlet.HttpSolrCall.handleAdmin(HttpSolrCall.java:734)
        at org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:715)
        at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:496)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219)
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:531)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)
        at java.lang.Thread.run(Thread.java:748)

2019-02-02 20:10:19.609 INFO  (qtp1571967156-14) [   x:testcollection_shard2_replica_n4] o.a.s.s.HttpSolrCall
[admin] webapp=null path=/admin/cores params={core=testcollection_shard2_replica_n4&action=REQUESTRECOVERY&wt=javabin&version=2}
status=400 QTime=0
2019-02-02 20:10:19.701 INFO  (qtp1571967156-135) [   x:testcollection_shard2_replica_n4]
o.a.s.h.a.CoreAdminOperation It has been requested that we recover: core=testcollection_shard2_replica_n4
2019-02-02 20:10:19.702 ERROR (qtp1571967156-135) [   x:testcollection_shard2_replica_n4]
o.a.s.h.RequestHandlerBase org.apache.solr.common.SolrException: Unable to locate core testcollection_shard2_replica_n4
        at org.apache.solr.handler.admin.CoreAdminOperation.lambda$static$5(CoreAdminOperation.java:167)
        at org.apache.solr.handler.admin.CoreAdminOperation.execute(CoreAdminOperation.java:360)
        at org.apache.solr.handler.admin.CoreAdminHandler$CallInfo.call(CoreAdminHandler.java:395)
        at org.apache.solr.handler.admin.CoreAdminHandler.handleRequestBody(CoreAdminHandler.java:180)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
        at org.apache.solr.servlet.HttpSolrCall.handleAdmin(HttpSolrCall.java:734)
        at org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:715)
        at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:496)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219)
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:531)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)
        at java.lang.Thread.run(Thread.java:748)

2019-02-02 20:10:19.702 INFO  (qtp1571967156-135) [   x:testcollection_shard2_replica_n4]
o.a.s.s.HttpSolrCall [admin] webapp=null path=/admin/cores params={core=testcollection_shard2_replica_n4&action=REQUESTRECOVERY&wt=javabin&version=2}
status=400 QTime=0


So the leader to leader replication is successful but the target leader is not able to replicate
to the follower.

So after some more investigation I found it's the call to recover the core that is having
issues. When it makes the call to /solr/admin/cores?core=testcollection_shard2_replica_n4&action=REQUESTRECOVERY
that is when it is unable to locate core. It's actually sending the call to the wrong host.

So our setup is like the following: numShards: 3, replicationFact: 2, maxShards: 2.

I wanted to retest it so I deleted and recreated the collection and the aftermath looked like
the following:
targetServer1s: s2r4 (shard 3, replica8), s3r10
targetServer2: s1,r1, s3r8,
targetServer3: s2r6, s3r10

sourceServer1: s2r4, s3r10
sourceServer2: s1r2, s3r8
sourceServer3: s1r1, s2r6

When running CDCR once again the replication to the leaders was successful. The leaders for
both were: s2r4, s3r10, s1r1.
After CDCR,  the source cluster made a call to recover s2r6. The source sent this call to
targetServer1 which contained s2r4, and s3r10.  As s2r6 is on targetServer3, the call was
unsuccessful as it was not able to locate s2r6 on targetServer1.

Unsure of a fix at this time.

-----Original Message-----
From: Erick Erickson [mailto:erickerickson@gmail.com]
Sent: Saturday, February 2, 2019 9:56 AM
To: solr-user <solr-user@lucene.apache.org>
Subject: [EXTERNAL] Re: [CDCR]Unable to locate core

CDCR does _not_ replicate to followers, it is a leader<->leader replication of the raw
document.

Once the document has been forwarded to the target's leader, then the leader on the target
system should forward it to followers on that system just like any other update.

The Solr JIRA is unlikely the problem from what you describe.

1> are you sure you are _committing_ on the target system?
2> "unable to locate core" comes from where? The source? Target?
   CDCR?
3> is your target collection properly set up? Because it sounds
   a bit like your target cluster isn't running in SolrCloud mode.

Best,
Erick

On Fri, Feb 1, 2019 at 12:48 PM Tim <timothy.springsteen@gm.com> wrote:
>
> After some more investigation it seems that we're running into the
> same bug found here <https://issues.apache.org/jira/browse/SOLR-11724>  .
>
> However if my understanding is correct that bug in 7.3 was patched out.
> Unfortunately we're running into the same behavior in 7.5
>
> CDCR is replicating successfully to the leader node but is not
> replicating to the followers.
>
>
>
> --
> Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html


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