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https://issues.apache.org/jira/browse/SOLR-7271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387325#comment-14387325
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Gregory Chanan commented on SOLR-7271:
--------------------------------------
bq. My own experience and view is that SolrCloud has been changing so fast
that it's surprising you can get ANY different client/server versions to work
properly together, and if the client is older than the server, it might be
impossible.
Well, looks like I found another issue :). Going to upload another patch.
bq. At this point I don't think we should worry about committing anything like
this to an old 4.x branch, but for users who may be stuck in a situation where
they cannot upgrade, it's awesome to have this issue to describe the problem
and a patch that will allow them to stay functional until they can upgrade.
Sounds reasonable. I'll mark this as Won't Fix. Anyone can use the patch here
or reopen the jira if they think otherwise.
> 4.4 client to 4.5+ server compatibility Issue due to DocRouter format
> ---------------------------------------------------------------------
>
> Key: SOLR-7271
> URL: https://issues.apache.org/jira/browse/SOLR-7271
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.5
> Reporter: Gregory Chanan
> Assignee: Gregory Chanan
> Fix For: 4.10.5
>
> Attachments: SOLR-7271.patch
>
>
> SOLR-4221 changed the router format from e.g.:
> {code}
> ...
> "router":"compositeId”,
> ...
> {code}
> to:
> {code}
> ...
> "router":{"name":"compositeId"},
> ...
> {code}
> This later commit:
> https://github.com/apache/lucene-solr/commit/54a94eedfd5651bb088e8cbd132393b771f5f5c2
> added backwards compatibility in the sense that the server can read the old
> router format. But the old 4.4 client can't read the new format, e.g. you
> get:
> {code}
> org.apache.solr.common.SolrException: Unknown document router
> '{name=compositeId}'
> at
> org.apache.solr.common.cloud.DocRouter.getDocRouter(DocRouter.java:46)
> at
> org.apache.solr.common.cloud.ClusterState.collectionFromObjects(ClusterState.java:289)
> at org.apache.solr.common.cloud.ClusterState.load(ClusterState.java:257)
> at org.apache.solr.common.cloud.ClusterState.load(ClusterState.java:233)
> at
> org.apache.solr.common.cloud.ZkStateReader.createClusterStateWatchersAndUpdate(ZkStateReader.java:357)
> at com.cloudera.itest.search.util.ZkExecutor.<init>(ZkExecutor.java:39)
> at
> com.cloudera.itest.search.util.SearchTestBase.getZkExecutor(SearchTestBase.java:648)
> at
> com.cloudera.itest.search.util.SearchTestBase.setupSolrURL(SearchTestBase.java:584)
> at
> com.cloudera.itest.search.util.SearchTestBase.setupEnvironment(SearchTestBase.java:371)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> {code}
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