我一直在尝试使用 Google AppEngine 的实验性搜索 API。我使用的是 SDK 1.6.6。
到目前为止，我可以将条目添加到索引并在我的开发环境中搜索它。
当我部署应用程序时，我仍然可以向索引添加条目，但是当我尝试
执行搜索，我得到以下异常日志：
br.com.qmagico.server.service.search.GenericSearchService search: Busca com query 'soma' falhou
com.google.appengine.api.search.SearchException:
at com.google.appengine.api.search.IndexImpl$3.convertException(IndexImpl.java:268)
at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:106)
at com.google.appengine.api.search.FutureHelper.getInternal(FutureHelper.java:74)
at com.google.appengine.api.search.FutureHelper.quietGet(FutureHelper.java:33)
at com.google.appengine.api.search.IndexImpl.search(IndexImpl.java:390)
at br.com.qmagico.server.service.search.GenericSearchService.search(GenericSearchService.java:109)
at br.com.qmagico.server.service.search.AulaSearchService.search(AulaSearchService.java:50)
at br.com.qmagico.server.handler.GetAulasHandler.executeLoggedException(GetAulasHandler.java:45)
at br.com.qmagico.server.handler.GetAulasHandler.executeLoggedException(GetAulasHandler.java:1)
at br.com.qmagico.server.QmActionHandler.execute(QmActionHandler.java:23)
at com.gwtplatform.dispatch.server.AbstractDispatchImpl.doExecute(AbstractDispatchImpl.java:153)
at com.gwtplatform.dispatch.server.AbstractDispatchImpl.execute(AbstractDispatchImpl.java:111)
at com.gwtplatform.dispatch.server.AbstractDispatchServiceImpl.execute(AbstractDispatchServiceImpl.java:81)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$1.run(Method_.java:165)
at java.security.AccessController.doPrivileged(Native Method)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:163)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_(Method_.java:124)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:43)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:249)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:477)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
at java.lang.Thread.run(Thread.java:679)
执行此搜索的代码如下：
public List<Long> search(Index index, String queryStr, String sortField) {
ArrayList<Long> ids = new ArrayList<Long>();
if (queryStr != null && !queryStr.isEmpty()) {
int limit = 5;
try {
QueryOptions.Builder builder = QueryOptions.newBuilder().setLimit(limit);
if (sortField != null) {
builder = builder.setSortOptions(SortOptions.newBuilder()
.addSortExpression(SortExpression.newBuilder()
.setExpression(sortField)
.setDefaultValue("")
.setDirection(SortExpression.SortDirection.DESCENDING))
.build());
}
QueryOptions queryOptions = builder.build();
Query query = Query.newBuilder()
.setOptions(queryOptions)
.build(queryStr);
LOG.info("Enviando query " + query);
Results<ScoredDocument> results = index.search(query);
for (ScoredDocument scoredDoc : results) {
ids.add(scoredDoc.getOnlyField("id").getNumber().longValue());
}
} catch (RuntimeException e) {
LOG.log(Level.SEVERE, "Busca com query '" + queryStr + "' falhou", e);
}
}
return ids;
}
有人知道我应该做什么来解决这个问题吗？
Thx!
如果您认为排序是您的问题，那么您可能需要考虑使用文档排名对索引中的文档进行预排序。文档中的排名字段默认设置为自 2011 年 1 月 1 日以来的秒数。但是，您可以提供整数排名值。例如，如果您想按价格对产品目录进行排序（从低到高，从高到低）。排名用于对索引中的文档进行预排序。
public Index getIndex(String indexName) {
IndexSpec indexSpec = IndexSpec.newBuilder().setName(indexName).build();
return SearchServiceFactory.getSearchService().getIndex(indexSpec);
}
Document doc = Document.newBuilder()
.addField(Field.newBuilder().setName('name').setText("some text"))
.setRank(functionToGetPrice())
.build();
getIndex("productHighToLow").put(doc);
doc = Document.newBuilder()
.addField(Field.newBuilder().setName('name').setText("some text"))
.setRank(MAXINT-functionToGetPrice())
.build();
getIndex("productLowToHigh").put(doc);
然后，当您搜索索引时，如果用户选择了“价格从低到高”并查询“LED TV”，那么您可以简单地发出如下查询
getIndex("productLowToHigh").search("LED TV");
即使对于大型（产品目录）索引，它也会更快且语义正确。
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