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https://issues.apache.org/jira/browse/SOLR-7746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14705757#comment-14705757
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Michael Sun commented on SOLR-7746:
-----------------------------------
Upload the patch to handle sharded ping requests inside PingRequestHandler.
There are two changes.
1. If the qt=/admin/ping for ping requests to shard, it delegates the request
to the default handler, "/select".
2. For ping requests to shard, PingRequestHandler returns what the delegated
handler returns. Therefore the result can be aggregated later. (Originally
PingRequestHandler removes most part from results that delegated handler
returns. It works fine with non-distributed requests but can break the
aggregation logic for distributed requests.)
> Ping requests stopped working with distrib=true in Solr 5.2.1
> -------------------------------------------------------------
>
> Key: SOLR-7746
> URL: https://issues.apache.org/jira/browse/SOLR-7746
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 5.2.1
> Reporter: Alexey Serba
> Attachments: SOLR-7746.patch, SOLR-7746.patch, SOLR-7746.patch
>
>
> {noformat:title="steps to reproduce"}
> # start 1 node SolrCloud cluster
> sh> ./bin/solr -c -p 8888
> # create a test collection (we won’t use it, but I just want to it to load
> solr configs to Zk)
> ./bin/solr create_collection -c test -d sample_techproducts_configs -p 8888
> # create another test collection with 2 shards
> curl
> 'http://localhost:8888/solr/admin/collections?action=CREATE&name=test2&numShards=2&replicationFactor=1&maxShardsPerNode=2&collection.configName=test'
> # try distrib ping request
> curl
> 'http://localhost:8888/solr/test2/admin/ping?wt=json&distrib=true&indent=true'
> ...
> "error":{
> "msg":"Ping query caused exception: Error from server at
> http://192.168.59.3:8888/solr/test2_shard2_replica1: Cannot execute the
> PingRequestHandler recursively"
> ...
> {noformat}
> {noformat:title="Exception"}
> 2116962 [qtp599601600-13] ERROR org.apache.solr.core.SolrCore [test2 shard2
> core_node1 test2_shard2_replica1] – org.apache.solr.common.SolrException:
> Cannot execute the PingRequestHandler recursively
> at
> org.apache.solr.handler.PingRequestHandler.handlePing(PingRequestHandler.java:246)
> at
> org.apache.solr.handler.PingRequestHandler.handleRequestBody(PingRequestHandler.java:211)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2064)
> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:654)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:450)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:196)
> {noformat}
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