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https://issues.apache.org/jira/browse/SOLR-3314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246132#comment-13246132
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Bernd Fehling commented on SOLR-3314:
-------------------------------------
A very dirty workaround for me so far, I have placed the log.info from
LogUpdateProcessor.finish() within try/catch and ignore errors, which prevents
rollbacks.
> DIH with multi-threading throws exception
> -----------------------------------------
>
> Key: SOLR-3314
> URL: https://issues.apache.org/jira/browse/SOLR-3314
> Project: Solr
> Issue Type: Bug
> Components: contrib - DataImportHandler
> Affects Versions: 3.6
> Reporter: Bernd Fehling
> Assignee: James Dyer
> Fix For: 3.6
>
>
> While loading with DIH in multi-threading mode there are sometimes exceptions.
> {code}
> Apr 4, 2012 10:19:10 AM org.apache.solr.common.SolrException log
> SEVERE: Full Import failed:java.lang.ClassCastException: java.util.ArrayList
> cannot be cast to java.lang.String
> at org.apache.solr.common.util.NamedList.getName(NamedList.java:131)
> at org.apache.solr.common.util.NamedList.toString(NamedList.java:258)
> at java.lang.String.valueOf(String.java:2826)
> at java.lang.StringBuilder.append(StringBuilder.java:115)
> at
> org.apache.solr.update.processor.LogUpdateProcessor.finish(LogUpdateProcessorFactory.java:188)
> at
> org.apache.solr.update.processor.UpdateRequestProcessor.finish(UpdateRequestProcessor.java:78)
> at
> org.apache.solr.handler.dataimport.SolrWriter.close(SolrWriter.java:53)
> at
> org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:268)
> at
> org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:375)
> at
> org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:445)
> at
> org.apache.solr.handler.dataimport.DataImporter$3.run(DataImporter.java:426)
> Apr 4, 2012 10:19:10 AM org.apache.solr.update.DirectUpdateHandler2 rollback
> INFO: start rollback
> Apr 4, 2012 10:19:10 AM org.apache.solr.update.DirectUpdateHandler2 rollback
> INFO: end_rollback
> {code}
> Analysis:
> After loading the LogUpdateProcessor produces the logs by writing the content
> of "toLog" and the elapsed time.
> {code}
> log.info( "" + toLog + " 0 " + (elapsed) );
> {code}
> "toLog" is a NamedList of org.apache.solr.common.util.NamedList which will be
> prepared for printing with methods "toString", "getName" and "getVal". The
> NamedList consists of name/value pairs, where the name must always be a
> String. As the exceptions points out it somehow happens that the name can be
> an ArrayList.
> To trace this further down I modified org.apache.solr.common.util.NamedList
> the method "getName" as following:
> {code}
> public String getName(int idx) {
> if (nvPairs.get(idx <<
> 1).getClass().getName().equals("java.util.ArrayList")) {
> System.out.println( "<Object>>" + nvPairs.get(idx << 1).toString() +
> "<" );
> }
> return (String)nvPairs.get(idx << 1);
> }
> {code}
> After several tries I could procude an exception and the output was:
> {code}
> <Object>>[testdir2_testfile2_record2, testdir2_testfile2_record3,
> testdir2_testfile2_record2, testdir2_testfile2_record1,
> testdir2_testfile2_record3, testdir2_testfile2_record1,
> testdir2_testfile2_record1, testdir2_testfile2_record2, ... (24 adds)]<
> {code}
> What we see here is:
> - we have 2 files in 2 directories each of 3 records but it reports "24
> adds", while the index afterwards only has the 6 records (self-healing by
> uniq IDs in the index)
> - the record IDs are multiple times in the ArrayList
> As a matter of fact something is not thread-safe. The
> "LogUpdateProcessorFactory"???
> I have no idea how to provide a unit test for this one as it is only in DIH
> multi-theading mode and only sometimes.
> Nevertheless it would be bad to have a rollback after loading some million
> records :-(
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