[英]Directory lock error with Lucene.Net usage in an ASP.NET MVC site
我正在构建一个ASP.NET MVC站点,我想使用Lucene.Net进行搜索。 我已经构建了一个SearchController及其所有方法,但是我在运行时遇到一个错误,这个错误是在首次初始化SearchController时发生的。
在SearchController中,这是我如何创建IndexWriter:
public static string IndexLocation = HostingEnvironment.MapPath("~/lucene");
public static Lucene.Net.Analysis.Standard.StandardAnalyzer analyzer = new Lucene.Net.Analysis.Standard.StandardAnalyzer();
public static IndexWriter writer = new IndexWriter(IndexLocation,analyzer);
错误发生在最后一行。 这是我得到的信息:
Lucene.Net.Store.LockObtainFailedException: Lock获取超时 :SimpleFSLock @ C:\\ Users \\ Username \\ Desktop \\ SiteSolution \\ Site \\ lucene \\ write.lock
此外,这是堆栈跟踪:
[LockObtainFailedException: Lock obtain timed out: SimpleFSLock@C:\Users\Username\Desktop\SiteSolution\Site\lucene\write.lock]
Lucene.Net.Store.Lock.Obtain(Int64 lockWaitTimeout) in C:\Users\Username\Desktop\Lucene.Net_2_9_2\src\Lucene.Net\Store\Lock.cs:107
Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean create, Boolean closeDir, IndexDeletionPolicy deletionPolicy, Boolean autoCommit, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit) in C:\Users\Username\Desktop\Lucene.Net_2_9_2\src\Lucene.Net\Index\IndexWriter.cs:1827
Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean closeDir, IndexDeletionPolicy deletionPolicy, Boolean autoCommit, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit) in C:\Users\Username\Desktop\Lucene.Net_2_9_2\src\Lucene.Net\Index\IndexWriter.cs:1801
Lucene.Net.Index.IndexWriter..ctor(String path, Analyzer a) in C:\Users\Username\Desktop\Lucene.Net_2_9_2\src\Lucene.Net\Index\IndexWriter.cs:1350
Site.Controllers.SearchController..cctor() in C:\Users\Username\Desktop\SiteSolution\Site\Controllers\SearchController.cs:95
[TypeInitializationException: The type initializer for 'Site.Controllers.SearchController' threw an exception.]
[TargetInvocationException: Exception has been thrown by the target of an invocation.]
System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) +86
System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) +230
System.Activator.CreateInstance(Type type, Boolean nonPublic) +67
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +80
[InvalidOperationException: An error occurred when trying to create a controller of type 'Site.Controllers.SearchController'. Make sure that the controller has a parameterless public constructor.]
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +190
System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +68
System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +118
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +46
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +63
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +13
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8682818
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
我该如何解决这个问题?
更新:我已经开始再次研究这个特定的项目了,似乎我还没有完全解决这个问题。
真正的问题是在索引使用结束后没有删除write.lock
文件 。 基于我接受的答案,我理解基本的实现逻辑,但我不确定我是否已正确实现它。 以下是我班级中可能无效的其他一些方法:
public ActionResult Search(string query)
{
var reader = writer.GetReader(); // Get reader from writer
var searcher = new IndexSearcher(reader); // Build IndexSearch
//Execute search...
// Dispose of objects
searcher = null;
reader = null;
return View();
}
public void AddToIndex(Document doc)
{
writer.AddDocument(doc);
writer.Flush();
writer.Optimize();
writer.Flush();
}
private bool disposed = false;
protected override void Dispose(bool disposing)
{
if (!disposed)
{
if (disposing)
{
// Release managed resources.
}
try
{
writer.Close();
writer = null;
}
catch
{
}
// Release unmanaged resources.
// Set large fields to null.
// Call Dispose on your base class.
disposed = true;
}
base.Dispose(disposing);
}
有什么想法吗?
发生这种情况的原因是编写器创建了一个名为write.lock的空文件作为跨进程锁。 当该文件存在时,Lucene假定有人在该目录上有写锁定。
如果错误地终止进程,则不会删除该文件。 所以Lucene认为有人仍然坚持锁定。 这就是为什么你应该总是有一个关闭索引的finally
语句。
如果你确定该文件存在错误(即没有运行Lucene进程),只需删除该文件即可。 但是,您的索引可能处于损坏状态,因为写作显然是在中途终止。
似乎是对lucene的死锁。
如果假设没有索引更新到集合中,
只需删除此锁定文件C:\\Users\\Username\\Desktop\\SiteSolution\\Site\\lucene\\write.lock
。
之后重新运行索引编写。
try
{
writer = new IndexWriter(directory, new StandardAnalyzer(), IndexWriter.MaxFieldLength.UNLIMITED);
}
catch (LockObtainFailedException ex)
{
DirectoryInfo indexDirInfo = new DirectoryInfo(directory);
FSDirectory indexFSDir = FSDirectory.Open(indexDirInfo, new Lucene.Net.Store.SimpleFSLockFactory(indexDirInfo));
IndexWriter.Unlock(indexFSDir);
writer = new IndexWriter(directory, new StandardAnalyzer(), IndexWriter.MaxFieldLength.UNLIMITED);
}
自己研究这个似乎是indended方法是使用多个物理索引,然后使用IndexWriter的.addIndexesNoOptimize或.addIndexes合并它们以合并所有并发索引更改。
没有自己检查但是不会这样(在创建azureDirectory对象后写)?
azureDirectory.ClearLock("write.lock")
我遇到了同样的问题,我正在使用IProviderContext。 在我的情况下,我不得不:优化,提交和处置ProviderContext。
providerContext.Optimize();
providerContext.Commit();
providerContext.Dispose();
我希望这有帮助。 实现上面的代码片段后,我的索引成功重建。
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