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https://issues.apache.org/jira/browse/HADOOP-9107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13506980#comment-13506980
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Hari Shreedharan commented on HADOOP-9107:
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(1) is insufficient since clients often do not directly call this method. I
believe that if this method gets interrupted:
* Clean up the call object - seems like some clean up is required in the
Connection object.
* throw InterruptedException, regardless of whether the calls complete
successfully or not.
> Hadoop IPC client eats InterruptedException and sets interrupt on the thread
> which is not documented
> ----------------------------------------------------------------------------------------------------
>
> Key: HADOOP-9107
> URL: https://issues.apache.org/jira/browse/HADOOP-9107
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 1.1.0, 2.0.2-alpha
> Reporter: Hari Shreedharan
>
> This code in Client.java looks fishy:
> {code}
> public Writable call(RPC.RpcKind rpcKind, Writable rpcRequest,
> ConnectionId remoteId) throws InterruptedException, IOException {
> Call call = new Call(rpcKind, rpcRequest);
> Connection connection = getConnection(remoteId, call);
> connection.sendParam(call); // send the parameter
> boolean interrupted = false;
> synchronized (call) {
> while (!call.done) {
> try {
> call.wait(); // wait for the result
> } catch (InterruptedException ie) {
> // save the fact that we were interrupted
> interrupted = true;
> }
> }
> if (interrupted) {
> // set the interrupt flag now that we are done waiting
> Thread.currentThread().interrupt();
> }
> if (call.error != null) {
> if (call.error instanceof RemoteException) {
> call.error.fillInStackTrace();
> throw call.error;
> } else { // local exception
> InetSocketAddress address = connection.getRemoteAddress();
> throw NetUtils.wrapException(address.getHostName(),
> address.getPort(),
> NetUtils.getHostname(),
> 0,
> call.error);
> }
> } else {
> return call.getRpcResult();
> }
> }
> }
> {code}
> Blocking calls are expected to throw InterruptedException if that is
> interrupted. Also it seems like this method waits on the call objects even if
> it is interrupted. Currently, this method does not throw an
> InterruptedException, nor is it documented that this method interrupts the
> thread calling it. If it is interrupted, this method should still throw
> InterruptedException, it should not matter if the call was successful or not.
> This is a major issue for clients which do not call this directly, but call
> HDFS client API methods to write to HDFS, which may be interrupted by the
> client due to timeouts, but does not throw InterruptedException. Any HDFS
> client calls can interrupt the thread but it is not documented anywhere.
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