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https://issues.apache.org/jira/browse/ZOOKEEPER-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14622492#comment-14622492
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Roman Iakovlev commented on ZOOKEEPER-2231:
-------------------------------------------
Sorry if I'm asking something obvious, but where do I find the planned release
timeframe for the 3.0?
> ServerSocket opened by ZooKeeperServer cannot use SO_REUSEADDR under Linux
> --------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2231
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2231
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.6
> Environment: $ uname -a
> Linux 3.19.0-20-generic #20-Ubuntu SMP Fri May 29 10:10:47 UTC 2015 x86_64
> x86_64 x86_64 GNU/Linux
> $ java -version
> java version "1.7.0_60"
> Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
> Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)
> Reporter: Gábor Lipták
>
> I think reporting [this stackoverflow
> question|http://stackoverflow.com/q/31163513/337621] to the ZooKeeper team is
> important.
> org.apache.zookeeper.server.NIOServerCnxnFactory.configure(InetSocketAddress,
> int) has the following code:
> {code:java}
> @Override
> public void configure(InetSocketAddress addr, int maxcc) throws IOException {
> configureSaslLogin();
> thread = new Thread(this, "NIOServerCxn.Factory:" + addr);
> thread.setDaemon(true);
> maxClientCnxns = maxcc;
> this.ss = ServerSocketChannel.open();
> ss.socket().setReuseAddress(true);
> LOG.info("binding to port " + addr);
> ss.socket().bind(addr);
> ss.configureBlocking(false);
> ss.register(selector, SelectionKey.OP_ACCEPT);
> }
> {code}
> So the intention is to use SO_REUSEADDR. This does not work under linux (at
> least with the java version I use). The reason is that
> sun.nio.ch.ServerSocketChannelImpl.setOption(SocketOption<T>, T) used by
> ZooKeeper has this code:
> {code:java}
> public <T> ServerSocketChannel setOption(SocketOption<T> paramSocketOption, T
> paramT) throws IOException
> {
> if (paramSocketOption == null)
> throw new NullPointerException();
> if (!(supportedOptions().contains(paramSocketOption)))
> throw new UnsupportedOperationException("'" + paramSocketOption + "'
> not supported");
> synchronized (this.stateLock) {
> if (!(isOpen()))
> throw new ClosedChannelException();
> if ((paramSocketOption == StandardSocketOptions.SO_REUSEADDR) &&
> (Net.useExclusiveBind()))
> {
> this.isReuseAddress = ((Boolean)paramT).booleanValue();
> }
> else {
> Net.setSocketOption(this.fd, Net.UNSPEC, paramSocketOption,
> paramT);
> }
> return this;
> }
> }
> {code}
> "Net.useExclusiveBind()" seems to give back always false under linux no
> matter what value is set for
> [sun.net.useExclusiveBind|http://www.oracle.com/technetwork/java/javase/7u25-relnotes-1955741.html#napi-win]
> environment entry.
> If someone wants to stop and start an embedded ZooKeeper server, it can
> result in BindExceptions. If there would be some workaround under Linux, it
> would be really good.
> Also under windows the sun.net.useExclusiveBind env entry seems to be
> important to have the SO_REUSEADDR option. Maybe it would worth to document
> this network setting.
> I have a [test code|http://pastebin.com/Hhyfiz3Y] which can reproduce the
> BindException under Linux.
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