Hi Andreas, Is there any other way to get around this? Please let me know if you have any other solution for this.
Thanks Yuva -----Original Message----- From: Andreas Veithen [mailto:[EMAIL PROTECTED] Sent: Tuesday, March 11, 2008 5:41 PM To: axis-user@ws.apache.org Subject: Re: Question regarding attachments with Axis and DataHandler Yuva, The implementation of the ByteArrayDataSource constructor you are using looks as follows: public ByteArrayDataSource(InputStream is, String type) throws IOException { ByteArrayOutputStream os = new ByteArrayOutputStream(); byte[] buf = new byte[8192]; int len; while ((len = is.read(buf)) > 0) os.write(buf, 0, len); this.data = os.toByteArray(); this.type = type; } As you can see, it will indeed read the entire Blob into a ByteArrayOutputStream and then copy it to a byte array. It is therefore not surprising that you run out of memory. Andreas On 11 Mar 2008, at 21:42, Chandolu, Yuva wrote: > Hi, > > I am trying to replace one servlet serving huge files by a > webservice. When request comes in, the servlet opens InputStream to > the file blob in database, read from the input stream and write to > the http output stream. When client starts pulling the data it comes > straight from the input stream of the servlet (pure streaming). In > which case the Servlet can handle 100s of clients because the > Servlet threads are not trying to load the whole file into memory on > the server side and just sending down the data when it is read from > the client side. > > Now I am trying to replace the servlet code by a web service. I am > using DataHanlder for attachements. We have big files in database > (each 10MB or more). When the client call my service > downloadfile(fileName) I need to pull it from the database and > create a datahandler and return to the client. My concern is what > will happen if 100 clients request the all big files (say each 10 MB > in size) using downloadFile() service. My question here is how the > datahandler works, will it read all the file contents from file blob > from database and store in memory before we return it to the client? > Looks like it is because my tomcat is running out of memory when I > tried 20 client threads in parallel requesting for big files. How > can I solve the problem? > > Following is my code snippet > > Blob file_blob = rs.getBlob(1); > ByteArrayDataSource bds = new > ByteArrayDataSource(file_blob.getBinaryStream(), "application/octet- > stream"); > DataHandler data_handler = new DataHandler(bds); > > return data_handler; > > Thanks in advance > Yuva --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
