{"id":155965,"date":"2020-09-10T19:20:24","date_gmt":"2020-09-10T11:20:24","guid":{"rendered":"http:\/\/4563.org\/?p=155965"},"modified":"2020-09-10T19:20:24","modified_gmt":"2020-09-10T11:20:24","slug":"netty-%e5%a4%9a%e7%ba%bf%e7%a8%8b%e4%b8%8b%e8%bd%bd%e6%9c%8d%e5%8a%a1%e5%99%a8-oom","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=155965","title":{"rendered":"netty \u591a\u7ebf\u7a0b\u4e0b\u8f7d\u670d\u52a1\u5668 OOM"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  netty \u591a\u7ebf\u7a0b\u4e0b\u8f7d\u670d\u52a1\u5668 OOM               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : OliverDD <\/span>  <span><i><\/i> 3<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\"> <\/p>\n<p>\u6b63\u5728\u5b66\u4e60 netty\uff0c\u4eca\u5929\u5229\u7528\u6240\u5b66\u77e5\u8bc6\u642d\u5efa\u4e86\u4e00\u4e2a\u7b80\u5355\u7684 HTTP \u591a\u7ebf\u7a0b\u4e0b\u8f7d\u670d\u52a1\u5668\u3002 \u8d34\u4e0b\u4ee3\u7801\uff1a \u5148\u662f ChannelInitializer \u7684\uff0c\u6211\u7528\u4e86 netty \u81ea\u5e26\u7684\u5904\u7406\u5668\u641e\u5b9a http \u534f\u8bae\u7f16\u89e3\u7801\u3001\u805a\u5408\u8fd8\u6709\u5927\u5757\u62c6\u5206<\/p>\n<pre><code>override fun initChannel(ch: SocketChannel) {     ch.pipeline().addLast(\"HttpCodec\", HttpServerCodec())     ch.pipeline().addLast(\"HttpAggregator\", HttpObjectAggregator(65536))     ch.pipeline().addLast(\"HttpChunked\", ChunkedWriteHandler())     ch.pipeline().addLast(\"RequestHandle\", RequestHandler(basePath)) } <\/code><\/pre>\n<p>\u6700\u91cd\u8981\u662f\u81ea\u5df1\u5b9e\u73b0\u7684<code>RequestHandler<\/code>\uff0c\u90e8\u5206\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>    override fun channelRead0(ctx: ChannelHandlerContext, msg: HttpRequest) {         val path = basePath + msg.uri()         logger.debug(\"Fetching $path\")         val file = File(path)         val rfile = RandomAccessFile(file, \"r\")         if (msg.headers().contains(\"Range\")) { \/\/ Multiple threads download             logger.debug(\"Find 'Range' in HttpRequest: ${msg.headers().get(\"Range\")}\")             val range = msg.headers().get(\"Range\").substring(6) \/\/ remove 'bytes='             \/\/ Line             val response = DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.PARTIAL_CONTENT)             val bIdx = range.substring(0, range.indexOf(\"-\")).toLong()             var eIdx = 0L             if (range.indexOf(\"-\") == range.length - 1) { \/\/ example: 0-                 \/\/ TODO: Judge bIdx &gt; file.size?                 eIdx = rfile.length() - 1             } else { \/\/ example: 0-100                 eIdx = range.substring(range.indexOf(\"-\") + 1, range.length).toLong()             }             logger.debug(\"bIdx = ${bIdx}; eIdx = ${eIdx}\")             \/\/ Headers             response.headers().set(\"Accept-Ranges\", \"bytes\")             response.headers().set(\"Content-Range\", \"bytes ${bIdx}-${eIdx}\/${rfile.length()}\")             response.headers().set(\"Content-Disposition\", \"attachment; filename=\"${file.name}\"\")             response.headers().set(\"Content-Type\", \"application\/octet-stream\")             response.headers().set(\"Content-Length\", \"${eIdx - bIdx + 1}\")             \/\/ Content             response.content().writeBytes(rfile.channel, bIdx, (eIdx - bIdx + 1).toInt())             ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE)         } else { \/\/ Single thread download             logger.debug(\"No 'Range' in HttpRequest\")             \/\/ Line             val response = DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK)             \/\/ Headers             response.headers().set(\"Accept-Ranges\", \"bytes\")             response.headers().set(\"Content-Range\", \"bytes ${0}-${rfile.length() - 1}\/${rfile.length()}\")             response.headers().set(\"Content-Disposition\", \"attachment; filename=\"${file.name}\"\")             response.headers().set(\"Content-Type\", \"application\/octet-stream\")             response.headers().set(\"Content-Length\", \"${rfile.length()}\")             \/\/ Content             response.content().writeBytes(rfile.channel, 0L, rfile.length().toInt())             ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE)         }     } <\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u81ea\u5df1\u4e3b\u8981\u662f\u5224\u65ad\u4f20\u7ed9\u6211\u7684 HttpRequest \u6709\u65e0 Range\uff0c\u5e76\u4e14\u8bbe\u7f6e<code>Content-Length<\/code>\u548c<code>Accept-Ranges<\/code>\u6765\u6307\u660e\u6211\u53ef\u4ee5\u65ad\u70b9\u7eed\u4f20\u3002<\/p>\n<p>\u4e00\u5207\u8fd0\u884c\u6b63\u5e38\uff0c\u9664\u4e86 OOM\uff0c\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u9519\u8bef\u5982\u4e0b\uff1a<\/p>\n<pre><code>java.lang.OutOfMemoryError: Direct buffer memory  at java.nio.Bits.reserveMemory(Bits.java:694)  at java.nio.DirectByteBuffer.&lt;init&gt;(DirectByteBuffer.java:123)  at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311)  at sun.nio.ch.Util.getTemporaryDirectBuffer(Util.java:241)  at sun.nio.ch.IOUtil.read(IOUtil.java:195)  at sun.nio.ch.FileChannelImpl.readInternal(FileChannelImpl.java:735)  at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:718)  at io.netty.buffer.UnpooledHeapByteBuf.setBytes(UnpooledHeapByteBuf.java:292)  at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1143)  at dd.oliver.htp.RequestHandler.channelRead0(RequestHandler.kt:65)  at dd.oliver.htp.RequestHandler.channelRead0(RequestHandler.kt:16) <\/code><\/pre>\n<p>\u8fd9\u4e2a\u62a5\u9519\u6307\u5411\u4e86<\/p>\n<pre><code>response.content().writeBytes(rfile.channel, bIdx, (eIdx - bIdx + 1).toInt()) <\/code><\/pre>\n<p>\u8fd9\u4e00\u884c\u3002<\/p>\n<p>\u6211\u5bfc\u51fa heapdump \u5e76\u7528 mat \u67e5\u770b\u540e\u786e\u8ba4\u662f\u67d0\u51e0\u4e2a EventLoop \u6301\u6709\u9ad8\u5185\u5b58\u975e\u5806\u5185\u7684 buffer \u3002\u8fd9\u79cd\u60c5\u51b5\u6309\u6211\u4e00\u5f00\u59cb\u7406\u89e3\u662f\u6b63\u5e38\u7684\uff0c\u56e0\u4e3a\u5ba2\u6237\u7aef\u5f00\u592a\u591a\u7ebf\u7a0b\u6211\u7684\u670d\u52a1\u5668\u4e5f\u5c31\u5f00\u4e86\u5f88\u591a Buffer \u3002\u53ef\u662f\u4eba\u5bb6\u5ba2\u6237\u7aef\u90fd\u6ca1\u6709\u4e1d\u6beb\u95ee\u9898\u800c\u6211\u670d\u52a1\u5668\u5374\u8fd9\u6837\u3002\uff08\u5185\u5b58\u5360\u7528\u4e5f\u4e0d\u4e00\u6837\uff0c\u6211\u670d\u52a1\u5668\u5185\u5b58\u5360\u7528\u5927\u6982\u6709 5 \u30016G\uff0c\u800c\u5ba2\u6237\u7aef\uff08 IDM \uff09\u53ea\u6709 500 \u3001600M \uff09<\/p>\n<p>\u8fd9\u4e0b\u6211\u72af\u96be\u4e86\uff0c\u6211\u5b8c\u5168\u6ca1\u6709\u76f8\u5173\u7ecf\u9a8c\u4e0d\u77e5\u9053\u4ece\u4f55\u4e0b\u624b\u3002\u6211\u60f3\u77e5\u9053\u6709\u6ca1\u6709\u5927\u4f6c\u6709\u5904\u7406\u7ecf\u9a8c\uff0c\u5982\u679c\u662f\u4f60\u4eec\u9047\u5230\u8fd9\u6837\u4f1a\u5982\u4f55\u53bb\u627e\u95ee\u9898\u89e3\u51b3\u95ee\u9898\u5462\uff1f<\/p>\n<\/p><\/div>\n<div> <b>\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (<span>0<\/span>)        <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<ul>\n<li>\n","protected":false},"excerpt":{"rendered":"<p>netty \u591a\u7ebf\u7a0b\u4e0b\u8f7d\u670d\u52a1\u5668 OO&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/155965"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=155965"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/155965\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=155965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=155965"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=155965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}