Initializing core takes very long at times

[Robert Krüger]

Hi,

for months/years, I have been experiencing occasional very long (30s+)
hangs when programmatically initializing a solr container in Java. The
application has worked for years in production with this setup without any
problems apart from this.

The code I have is this here:

 public void initContainer(File solrConfig) throws Exception {
            logger.debug("initializing solr container with config {}",
solrConfig);
            Preconditions.checkNotNull(solrConfig);
            Stopwatch stopwatch = Stopwatch.createStarted();
            container =
CoreContainer.createAndLoad(solrConfig.getParentFile().getAbsolutePath(),
solrConfig);
            containerInitialized = true;
            logger.debug("initializing solr container took {}", stopwatch);
            if (stopwatch.elapsed(TimeUnit.MILLISECONDS) > 1000) {
                logger.warn("initializing solr container took very long
({})", stopwatch);
            }
        }

So it is obviously the createAndLoad-Call. I posted about this a long time
ago and people suggested checking for uncommitted soft commits but now I
realized that I had these hangs in a test setup, where the index is created
from scratch, so that cannot be the problem.

Any ideas anyone?

My config is rather simple. Is there something wring with my locking
options that might cause this?

<config>

  <indexConfig>
    <lockType>native</lockType>
    <unlockOnStartup>true</unlockOnStartup>
    <ramBufferSizeMB>64</ramBufferSizeMB>
    <maxBufferedDocs>1000</maxBufferedDocs>
  </indexConfig>

  <luceneMatchVersion>LUCENE_43</luceneMatchVersion>

  <updateHandler class="solr.DirectUpdateHandler2">
    <autoCommit>
       <maxDocs>1000</maxDocs>
       <maxTime>10000</maxTime>
       <openSearcher>false</openSearcher>
    </autoCommit>
  </updateHandler>

  <requestDispatcher handleSelect="true" >
    <requestParsers enableRemoteStreaming="false"
multipartUploadLimitInKB="2048" />
  </requestDispatcher>

  <requestHandler name="standard" class="solr.StandardRequestHandler"
default="true" />
  <requestHandler name="/update" class="solr.UpdateRequestHandler" />
  <requestHandler name="/admin/"
class="org.apache.solr.handler.admin.AdminHandlers" />

  <filterCache class="solr.LRUCache" size="512" initialSize="512"
autowarmCount="256"/>
  <queryResultCache class="solr.LRUCache" size="512" initialSize="512"
autowarmCount="256"/>
  <documentCache class="solr.LRUCache" size="10000" initialSize="512"
autowarmCount="0"/>

  <admin>
    <defaultQuery>solr</defaultQuery>
  </admin>

</config>

Thank you in advance,

Robert