Race condition in
org/apache/solr/client/solrj/impl/StreamingUpdateSolrServer.java
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Key: SOLR-1711
URL: https://issues.apache.org/jira/browse/SOLR-1711
Project: Solr
Issue Type: Bug
Components: clients - java
Affects Versions: 1.4, 1.5
Reporter: Attila Babo
Priority: Critical
Fix For: 1.5
While inserting a large pile of documents using StreamingUpdateSolrServer there
is a race condition as all Runner instances stop processing while the blocking
queue is full. With a high performance client this could happen quite often,
there is no way to recover from it at the client side.
In StreamingUpdateSolrServer there is a BlockingQueue called queue to store
UpdateRequests, there are up to threadCount number of workers threads from
StreamingUpdateSolrServer.Runner to read that queue and push requests to a Solr
instance. If at one point the BlockingQueue is empty all workers stop
processing it and pushing the collected content to Solr which could be a time
consuming process, sometimes all worker threads are waiting for Solr. If at
this time the client fills the BlockingQueue to full all worker threads will
quit without processing any further and the main thread will block forever.
There is a simple, well tested patch handle this situation.
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