BooleanQuery$TooManyClauses的问题-优快云博客

本文分析了Apache Lucene搜索框架中出现的TooManyClauses异常原因，并提供了通过调整maxClauseCount参数来解决此问题的方法。但同时指出这种方法可能引发的内存溢出风险。

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org.apache.lucene.search.BooleanQuery$TooManyClauses: maxClauseCount is set to 1024
    at org.apache.lucene.search.BooleanQuery.add(BooleanQuery.java:165)
    at org.apache.lucene.search.BooleanQuery.add(BooleanQuery.java:156)
    at org.apache.lucene.search.PrefixQuery.rewrite(PrefixQuery.java:53)
    at org.apache.lucene.search.BooleanQuery.rewrite(BooleanQuery.java:408)
    at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:138)
    at org.apache.lucene.search.Query.weight(Query.java:94)
    at org.apache.lucene.search.Hits.<init>(Hits.java:42)
    at org.apache.lucene.search.Searcher.search(Searcher.java:45)
    at org.apache.lucene.search.Searcher.search(Searcher.java:37)
    at com.toodou.searcher.search.PodcasterSearcher.searchPodcaster(PodcasterSearcher.java:238)
    at com.toodou.searcher.search.PodcasterSearcher.doPodcasterSearch(PodcasterSearcher.java:66)
    at test.com.toodou.searcher.search.PodcasterSearcherTest.testdoPodcasterSearch(PodcasterSearcherTest.java:57)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at junit.framework.TestCase.runTest(TestCase.java:154)
    at junit.framework.TestCase.runBare(TestCase.java:127)
    at junit.framework.TestResult$1.protect(TestResult.java:106)
    at junit.framework.TestResult.runProtected(TestResult.java:124)
    at junit.framework.TestResult.run(TestResult.java:109)
    at junit.framework.TestCase.run(TestCase.java:118)
    at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

可以通过设置：
BooleanQuery.setMaxClauseCount(10000);
来解决问题，但是这样带来的问题是会使得内存开销加大。容易出现OutOfMemory的异常
所以需要非常谨慎处理。