StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PODirectory lock error with Lucene.Net usage in an ASP.NET MVC site
text
Body
copied!<p>I'm building an ASP.NET MVC site where I want to use Lucene.Net for search. I've already built a SearchController and all of its methods, but I'm getting an error at runtime that occurs when the SearchController is first initialized.</p> <p>In SearchController, here's how I'm creating an IndexWriter:</p> <pre><code>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); </code></pre> <p>The error occurs on the last line. Here's the message that I'm getting:</p> <blockquote> <p>Lucene.Net.Store.LockObtainFailedException: <strong>Lock obtain timed out</strong>: SimpleFSLock@C:\Users\Username\Desktop\SiteSolution\Site\lucene\write.lock</p> </blockquote> <p>Furthermore, here's the stack trace:</p> <pre><code>[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 </code></pre> <p><strong>How can I resolve this issue?</strong></p> <p><strong>UPDATE:</strong> I've started working on this particular project again, and it seems that I haven't fully resolved this issue yet.</p> <p>The real issue is that <strong>the <code>write.lock</code> file isn't being removed after index usage ends</strong>. Based on the answer I have accepted, I understand the basic implementation logic, but I'm not sure if I have implemented it correctly. Here are some other methods in my class that are probably invalid:</p> <pre><code> 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); } </code></pre> <p>Any thoughts?</p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload