On 12/23/2014 4:34 AM, Modassar Ather wrote: > Hi, > > I have a setup of 4 shard Solr cluster with embedded zookeeper on one of > them. The zkClient time out is set to 30 seconds, -Xms is 20g and -Xms is > 24g. > When executing a huge query with many wildcards inside it the server > crashes and becomes non-responsive. Even the dashboard does not responds > and shows connection lost error. This requires me to restart the servers.
Here's the important part of your message: *Caused by: java.lang.OutOfMemoryError: Java heap space* Your heap is not big enough for what Solr has been asked to do. You need to either increase your heap size or change your configuration so that it uses less memory. http://wiki.apache.org/solr/SolrPerformanceProblems#Java_Heap Most programs have pretty much undefined behavior when an OOME occurs. Lucene's IndexWriter has been hardened so that it tries extremely hard to avoid index corruption when OOME strikes, and I believe that works well enough that we can call it nearly bulletproof ... but the rest of Lucene and Solr will make no guarantees. It's very difficult to have definable program behavior when an OOME happens, because you simply cannot know the precise point during program execution where it will happen, or what isn't going to work because Java did not have memory space to create an object. Going unresponsive is not surprising. If you can solve your heap problem, note that you may run into other performance issues discussed on the wiki page that I linked. Thanks, Shawn
