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https://issues.apache.org/jira/browse/SOLR-4933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13686097#comment-13686097
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Mark Miller commented on SOLR-4933:
-----------------------------------
On a first pass the 500 error *looks* like it's coming from...
A sub shard that is created on the split command has just become a leader - it
says it has no replicas during the sync phase.
At around the same time, a request to wait on seeing a certain state fails
because the node that it is made to complains it is not the leader.
{noformat}
oasc.OverseerCollectionProcessor.processResponse ERROR Error from shard:
127.0.0.1:41393/fo/l
org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: We are
not the leader
{noformat}
The wait that fails here seems to be:
{noformat}
// wait for parent leader to acknowledge the sub-shard core
log.info("Asking parent leader to wait for: " + subShardName + " to be
alive on: " + nodeName);
CoreAdminRequest.WaitForState cmd = new CoreAdminRequest.WaitForState();
cmd.setCoreName(subShardName);
cmd.setNodeName(nodeName);
cmd.setCoreNodeName(nodeName + "_" + subShardName);
cmd.setState(ZkStateReader.ACTIVE);
cmd.setCheckLive(true);
cmd.setOnlyIfLeader(true);
sendShardRequest(nodeName, new ModifiableSolrParams(cmd.getParams()));
{noformat}
There a variety of reasons the leader might be briefly changing. There may be
more to dig up here, but it looks like it also might be a good idea to be
willing to retry this on this type of error.
> org.apache.solr.cloud.ShardSplitTest.testDistribSearch fails often with a 500
> error.
> ------------------------------------------------------------------------------------
>
> Key: SOLR-4933
> URL: https://issues.apache.org/jira/browse/SOLR-4933
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: Mark Miller
> Fix For: 5.0, 4.4
>
>
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