[CDCR]Unable to locate core

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Tim
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[CDCR]Unable to locate core

Tim
I'm trying to setup CDCR but I'm running into an issue where one or two
shards/replicas will not be replicated but the rest will out of the six
cores.

The only error that appears in the logs is: "Unable to locate core".

Occasionally restarting the instance will fix this but then the issue will
repeat itself next time there is an update to the source collection. But it
will not necessarily happen to the same core again.

Has anyone run into an error such as this before?




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Tim
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Re: [CDCR]Unable to locate core

Tim
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.



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Re: [CDCR]Unable to locate core

Erick Erickson
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 <[hidden email]> 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
Tim
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Re: [CDCR]Unable to locate core

Tim
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.





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Tim
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Re: [CDCR]Unable to locate core

Tim
So it looks like I'm having an issue with this fix:
https://issues.apache.org/jira/browse/SOLR-11724

So I've messed around with this for a while and every time the leader to
leader replica portion works fine. But the Recovery portion (implemented as
part of the fix above) fails.

I've run a few tests and every time the recovery portion kicks off, it sends
the recovery command to the node which has the leader for a given replica
instead of the follower.
I've recreated the collection several times so that replicas are on
different nodes with the same results each time. It seems to be assumed that
the follower is on the same solr node as the leader.
 
For example, if s3r10 (shard 3, replica 10) is the leader and is on node1,
while the follower s3r8 is on node2, then the core recovery command meant
for s3r8 is being sent to node1 instead of node2.





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