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https://issues.apache.org/jira/browse/SOLR-5014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14584752#comment-14584752
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Mark Miller commented on SOLR-5014:
-----------------------------------
This issue was duplicated and resolved in SOLR-7566
> The "no servers hosting shard" exception will never tell you the shard
> ----------------------------------------------------------------------
>
> Key: SOLR-5014
> URL: https://issues.apache.org/jira/browse/SOLR-5014
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.3
> Reporter: Jack Krupansky
>
> If none of the replicas for a shard are available, the "no servers hosting
> shard" exception is thrown. The code suggests that it will tell you which
> shard is available, but it does not. In fact, it can never do so.
> The reason is that the code at that point doesn't actually know the shard
> name or ID. The "shard" string passed to HttpShardHandler#submit method is
> "the | delimited list of equivalent servers". But... that list, by
> definition, is empty if all the servers are down for a shard.
> What I want to see is the actual shard name/ID, like "shard2".
> Here's the shard.info section from a response where the replicas for a second
> shard of a two-shard cluster have all been intentionally killed.
> {code}
> "shards.info":{
> "":{
> "error":"org.apache.solr.common.SolrException: no servers hosting
> shard: ",
> "trace":"org.apache.solr.common.SolrException: no servers hosting
> shard: \r\n\tat
> org.apache.solr.handler.component.HttpShardHandler$1.call(HttpShardHandler.java:149)\r\n\tat
>
> org.apache.solr.handler.component.HttpShardHandler$1.call(HttpShardHandler.java:119)\r\n\tat
> java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)\r\n\tat
> java.util.concurrent.FutureTask.run(Unknown Source)\r\n\tat
> java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)\r\n\tat
> java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)\r\n\tat
> java.util.concurrent.FutureTask.run(Unknown Source)\r\n\tat
> java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)\r\n\tat
> java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)\r\n\tat
> java.lang.Thread.run(Unknown Source)\r\n",
> "time":0},
>
> "207.237.114.232:8983/solr/collection1/|207.237.114.232:8985/solr/collection1/":{
> "numFound":8,
> "maxScore":1.0,
> "time":98}},
> {code}
> The request:
> {code}
> curl
> "http://localhost:8983/solr/select/?q=*:*&indent=true&wt=json&shards.info=yes&shards.tolerant=yes";
> {code}
> The shards.info section for the same request after the two killed replicas
> are restarted:
> {code}
> "shards.info":{
>
> "207.237.114.232:8984/solr/collection1/|207.237.114.232:8986/solr/collection1/":{
> "numFound":2,
> "maxScore":1.0,
> "time":224},
>
> "207.237.114.232:8983/solr/collection1/|207.237.114.232:8985/solr/collection1/":{
> "numFound":8,
> "maxScore":1.0,
> "time":898}},
> {code}
> Here's the cluster state for that cluster when all four nodes are up:
> {code}
> {"collection1":{
> "shards":{
> "shard1":{
> "range":"80000000-ffffffff",
> "state":"active",
> "replicas":{
> "core_node1":{
> "state":"active",
> "core":"collection1",
> "node_name":"207.237.114.232:8983_solr",
> "base_url":"http://207.237.114.232:8983/solr";,
> "leader":"true"},
> "core_node3":{
> "state":"active",
> "core":"collection1",
> "node_name":"207.237.114.232:8985_solr",
> "base_url":"http://207.237.114.232:8985/solr"}}},
> "shard2":{
> "range":"0-7fffffff",
> "state":"active",
> "replicas":{
> "core_node2":{
> "state":"active",
> "core":"collection1",
> "node_name":"207.237.114.232:8984_solr",
> "base_url":"http://207.237.114.232:8984/solr";,
> "leader":"true"},
> "core_node4":{
> "state":"active",
> "core":"collection1",
> "node_name":"207.237.114.232:8986_solr",
> "base_url":"http://207.237.114.232:8986/solr"}}}},
> "router":"compositeId"}}
> {code}
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