使用Lucene.net提高網站搜索速度整合記錄

時間 2019-12-05

標籤使用 lucene.net lucene 提高網站搜索速度整合記錄欄目網站開發简体版

原文原文鏈接

1.隨着網站數據量達到500萬條的時候,發現SQL數據庫若是使用LIKE語句來查詢,老是佔用CPU很忙,無論怎麼優化,速度仍是上不來;git

2.通過網上收集資料,HUBBLE.net目前雖然作得不錯,但須要配置內存給他,因爲服務器4G內存,並且運行了好幾個網站,因此考慮採用Lucene.net來作爲搜索引擎;github

3.雖然本地測試沒有問題,可是部署到64位的服務器上仍是通過了好幾天的折騰,在此都記錄一下.數據庫

在此記錄搜片神器的整個開發過程當中遇到的問題和相關的解決方案,但願你們一塊兒交流. 性能優化

Lucene軟件下載編譯整合的問題

網站採用了最新Lucene.Net.3.0.3版本的代碼,而後配置盤古分詞來進行.服務器

因爲Lucene.Net升級到了3.0.3後接口發生了很大變化，原來好多分詞庫都不能用了，框架

.Net下還有一個盤古分詞（http://pangusegment.codeplex.com/），但也不支持Lucene.Net 3.0.3，園子裏的大哥們修改的項目地址:ide

https://github.com/JimLiu/Lucene.Net.Analysis.PanGu性能

下載后里面有DEMO代碼進行整合.學習

Lucene在軟件中集成處理

因爲實時處理數據程序是WINFORM程序,因此須要採用軟件代碼來實時更新索引數據,這樣可控性高一些.測試

引用頭文件

using Lucene.Net.Analysis;
using Lucene.Net.Analysis.Standard;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.QueryParsers;
using Lucene.Net.Search;
using Lucene.Net.Store;
using Lucene.Net.Util;
using PanGu;
using Lucene.Net.Analysis.PanGu;
using PanGu.HighLight;
using FSDirectory = Lucene.Net.Store.FSDirectory;
using Version = Lucene.Net.Util.Version;

建立索引

    public static class H31Index
    {
        private static Analyzer analyzer = new PanGuAnalyzer(); //MMSegAnalyzer //StandardAnalyzer
        private static int ONEPAGENUM = 200;
        private static string m_indexPath = "";
        private static IndexWriter iw = null;
        public static void Init(string indexpath)
        {
            m_indexPath = indexpath;
        }

        public static bool OpenIndex()
        {
            try
            {

                DirectoryInfo INDEX_DIR = new DirectoryInfo(m_indexPath+"//Index");
                bool iscreate = true;
                if (INDEX_DIR.Exists)
                    iscreate = false;
                Int32 time21 = System.Environment.TickCount;
                if (iw == null)
                {
                    iw = new IndexWriter(FSDirectory.Open(INDEX_DIR), analyzer, iscreate, new IndexWriter.MaxFieldLength(32));
                    Int32 time22 = System.Environment.TickCount;
                    H31Debug.PrintLn("IndexWriter2[" + type.ToString() + "]:" + " IndexWriter:" + (time22 - time21).ToString() + "ms");
                    return true;
                }
            }
            catch (System.Exception ex)
            {
                H31Debug.PrintLn("OpenIndex" + ex.Message);
            }
            return false;
        }

        public static void CloseIndex()
        {
            try
            {
                if (iw != null)
                {
                    //if (count > 0)
                    {
                        iw.Commit();
                        iw.Optimize();
                    }
                    iw.Dispose();
                    iw = null;
                }            
            }
            catch (System.Exception ex)
            {
                H31Debug.PrintLn("CloseIndex" + ex.Message);
            }

        }

        //創建索引        
public static int AddIndexFromDB()
        {
            int res = 0;
            int count = 0;
            try
            {
                Int32 time0 = System.Environment.TickCount;
                while (count < OneTimeMax && iw != null)
                {
                    Int32 time11 = System.Environment.TickCount;
                    DataSet ds = H31SQL.GetHashListFromDB(type, startnum, startnum + ONEPAGENUM - 1, NewOrUpdate);
                    Int32 time12 = System.Environment.TickCount;
                    int cnt = ds.Tables[0].Rows.Count;
                    if (ds != null&& cnt>0)
                    {
                        Int32 time1 = System.Environment.TickCount;
                        count = count + cnt;
                        for (int i = 0; i < cnt; i++)
                        {
                            //ID,hashKey,recvTime,updateTime,keyContent,keyType,recvTimes,fileCnt,filetotalSize,Detail,viewTimes,viewLevel
                            Document doc = new Document();
                            doc.Add(new Field("ID", ds.Tables[0].Rows[i]["ID"].ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));//存儲，索引
                            doc.Add(new Field("hashKey", ds.Tables[0].Rows[i]["hashKey"].ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));//存儲，索引
                            doc.Add(new Field("recvTime", ds.Tables[0].Rows[i]["recvTime"].ToString(), Field.Store.YES, Field.Index.NO));//存儲，不索引
                            doc.Add(new Field("updateTime", ds.Tables[0].Rows[i]["updateTime"].ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));//存儲，索引
                            doc.Add(new Field("keyContent", ds.Tables[0].Rows[i]["keyContent"].ToString(), Field.Store.YES, Field.Index.ANALYZED));//存儲，索引
                            //PanGuFenCiTest(ds.Tables[0].Rows[i]["keyContent"].ToString());
                            string typeid=ds.Tables[0].Rows[i]["keyType"].ToString();
                            if(typeid.Length<2)
                                typeid=type.ToString();
                            doc.Add(new Field("keyType", typeid, Field.Store.YES, Field.Index.NO));//存儲，不索引
                            doc.Add(new Field("recvTimes", ds.Tables[0].Rows[i]["recvTimes"].ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));//存儲，索引
                            doc.Add(new Field("fileCnt", ds.Tables[0].Rows[i]["fileCnt"].ToString(), Field.Store.YES, Field.Index.NO));//存儲，不索引
                            doc.Add(new Field("filetotalSize", ds.Tables[0].Rows[i]["filetotalSize"].ToString(), Field.Store.YES, Field.Index.NO));//存儲，不索引
                            doc.Add(new Field("Detail", ds.Tables[0].Rows[i]["Detail"].ToString(), Field.Store.YES, Field.Index.NO));//存儲，不索引
                            doc.Add(new Field("viewTimes", ds.Tables[0].Rows[i]["viewTimes"].ToString(), Field.Store.YES, Field.Index.NO));//存儲，不索引
                            doc.Add(new Field("viewLevel", ds.Tables[0].Rows[i]["viewLevel"].ToString(), Field.Store.YES, Field.Index.NO));//存儲，不索引
                            iw.AddDocument(doc);
                        }
                        ds = null;
                        Thread.Sleep(10);
                    }
                    else
                    {
                        res = 1;
                        break;
                    }
                }

                Int32 time10 = System.Environment.TickCount;
                H31Debug.PrintLn("AddIndexFromDB[" + type.ToString() + "],Building index done:" + startnum.ToString() + " Time:" + (time10 - time0).ToString() + "ms");

            }
            catch (System.Exception ex)
            {
                H31Debug.PrintLn(ex.StackTrace);
            }

            return res; 
        }

建立索引代碼

查詢代碼

        //網站搜索代碼
        public static void Search(string keyword,int typeid,int pageNo)
        {
            int onePage=20;//一頁多少
            int TotalNum=1000;//一次加載多少

            if (pageNo < 0) pageNo = 0;
            if (pageNo * onePage > TotalNum)
                pageNo = TotalNum / onePage;

            //索引加載的目錄
            DirectoryInfo INDEX_DIR = new DirectoryInfo(m_indexPath+"//Index//index1");
            IndexSearcher searcher = new IndexSearcher(FSDirectory.Open(INDEX_DIR), true);
            QueryParser qp = new QueryParser(Version.LUCENE_30, "keyContent", analyzer);
            Query query = qp.Parse(keyword); 
            //Console.WriteLine("query> {0}", query);

            //設置排序問題
            Sort sort = new Sort(new SortField[]{new SortField("recvTimes", SortField.INT, true),new SortField("updateTime", SortField.STRING, true)});

            //設置高亮顯示的問題
            PanGu.HighLight.SimpleHTMLFormatter simpleHTMLFormatter = new PanGu.HighLight.SimpleHTMLFormatter("<font color=\"red\">", "</font>");
            PanGu.HighLight.Highlighter highlighter =new PanGu.HighLight.Highlighter(simpleHTMLFormatter,new Segment());
            highlighter.FragmentSize = 50;

            TopFieldDocs tds = searcher.Search(query,null, 1000, sort);
            Console.WriteLine("TotalHits: " + tds.TotalHits);

            /* 計算顯示的條目 */
            int count = tds.ScoreDocs.Length;
            int start = (pageNo - 1) * onePage;
            int end = pageNo * onePage > count ? count : pageNo * onePage;
            //返回集合列表
            for (int i = start; i < end; i++)
            {
                Document doc = searcher.Doc(tds.ScoreDocs[i].Doc);
                string contentResult = highlighter.GetBestFragment(keyword, doc.Get("keyContent").ToString());
                Console.WriteLine(contentResult + ">>" + doc.Get("recvTimes") + "<<" + doc.Get("updateTime"));
            }

            searcher.Dispose();
        }