Premise: During an upgrade I should be able to run a 7.3 pull replica
against a 7.2 tlog leader. Or vice versa.
Maybe I'm totally wrong in assuming that!
Assuming that's correct it looks like adding a new method[1] to
SolrResponse has broken binary compatibility. When I try to register a new
pull replica using the admin api[2] I get an HTTP 500 responseI see this
error logged: java.io.InvalidClassException:
org.apache.solr.client.solrj.SolrResponse; local class incompatible: stream
classdesc serialVersionUID = 3945300637328478755, local class
serialVersionUID = -793110010336024264
The replica actually seems to register ok it just can't read the response
because the bytes from the 7.2 leader include a different serialVersionUID.
Should SolrResponse include a serialVersionIUID? All subclasses too.
It looks like stock java serialization is only used for these admin
responses. Query responses use JavaBinCodec instead..
Full(ish) stack trace:
ERROR HttpSolrCall null:org.apache.solr.common.SolrException:
java.io.InvalidClassException: org.apache.solr.client.solrj.SolrResponse;
local class incompatible: st
ream classdesc serialVersionUID = 3945300637328478755, local class
serialVersionUID = -7931100103360242645
at
org.apache.solr.client.solrj.SolrResponse.deserialize(SolrResponse.java:73)
at
org.apache.solr.handler.admin.CollectionsHandler.sendToOCPQueue(CollectionsHandler.java:348)
at
org.apache.solr.handler.admin.CollectionsHandler.invokeAction(CollectionsHandler.java:256)
at
org.apache.solr.handler.admin.CollectionsHandler.handleRequestBody(CollectionsHandler.java:230)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:195)
at
org.apache.solr.servlet.HttpSolrCall.handleAdmin(HttpSolrCall.java:736)
at
org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:717)
at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:498)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:384)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:330)
[1]
https://github.com/apache/lucene-solr/commit/5ce83237e804ac1130eaf5cf793955667793fee0#diff-b809fa594f93aa6805381029a188e4e2R46
[2]
http://localhost:8983/solr/admin/collections?action=ADDREPLICA&collection=blah&shard=shard1&node=blah&type=pull
Thanks,
Will
