Hi Joe,

I was trying to clear indexing on pages of a page tree branch. Each call to IndexHelper.ClearPageIndexAsync(pageSetting) opens an instance of IndexReader in a new thread and deletes document as shown in below function

private static bool ClearPageIndex(PageSettings pageSettings)
 {
            if (pageSettings == null) return false;
            bool result = false;

            try
            {
                string indexPath = pageSettings.IndexPath;

                if (IndexReader.IndexExists(indexPath))
                {
                    IndexReader reader = IndexReader.Open(indexPath);
                    try
                    {
                        int tot = reader.NumDocs();
                        for (int i = 0; i < tot; i++)
                        {
                            Document doc = reader.Document(i);
                            if (doc.GetField("PageID").StringValue() ==
                                pageSettings.PageId.ToString(CultureInfo.InvariantCulture))
                            {
                                if (log.IsDebugEnabled) log.Debug("ClearPageIndex about to delete doc ");
                                try
                                {
                                    reader.DeleteDocument(i);
                                    result = true;
                                }
                                catch (IOException)
                                {
                                }
                            }
                        }
                    }
                    finally
                    {
                        reader.Close();
                    }
                }
            }
            catch (ArgumentException ex)
            {
                log.Error(ex);
            }

            return result;
        }

I have resolved issue for 3 pages in loop by using lock and puting check !reader.IsDeleted(i) before deletion. But for more pages it still gives error "trying to delete already deleted document".

Any idea how to resolve above situation...

Hi Joe,

Your suggestion can lead to alternate solution. But I am able to resolve my issue on solution on my path after some R&D as follow that I would like share

private

static object my_lock = new object();

 private static bool ClearPageIndex(PageSettings pageSettings)
        {
            if (pageSettings == null) return false;
            bool result = false;

            lock (my_lock)
            {
                try
                {                  
                    string indexPath = pageSettings.IndexPath;

                    if (IndexReader.IndexExists(indexPath))
                    {
                   
                        IndexWriter wr = new IndexWriter(indexPath, new StandardAnalyzer());
                        try
                        {
                            wr.DeleteDocuments(new Term("PageID", pageSettings.PageId.ToString(CultureInfo.InvariantCulture)));                 
                        }
                        finally
                        {
                            wr.Close();                       
                        }
                    }
                }
                catch (ArgumentException ex)
                {
                    log.Error(ex);
                }
            }

            return result;
        }