Jessica Cheng created SOLR-5263:
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Summary: CloudSolrServer URL cache update race
Key: SOLR-5263
URL: https://issues.apache.org/jira/browse/SOLR-5263
Project: Solr
Issue Type: Bug
Components: clients - java, SolrCloud
Affects Versions: 4.4
Reporter: Jessica Cheng
In CloudSolrServer.request, urlLists (and the like) is updated if
lastClusterStateHashCode is different from the current hash code of
clusterState. However, each time this happen, only the cache entry for the
current collection being requested is updated. In the following condition this
causes a race:
query collection A so a cache entry exists
update collection A
query collection B, request method notices the hash code changed and update
cache for collection B, updates lastClusterStateHashCode
query collection A, since lastClusterStateHashCode has been updated, no update
for cache for collection A even though it's stale
Can fix one of two ways:
1. Track lastClusterStateHashCode per collection and lazily update each entry
2. Every time we notice lastClusterStateHashCode != clusterState.hashCode(),
2a. rebuild the entire cache for all collections
2b. clear all current cache for collections
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