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Posted to dev@hc.apache.org by "Gary D. Gregory (Jira)" <ji...@apache.org> on 2021/11/04 18:07:00 UTC
[jira] [Commented] (HTTPCORE-695) Unhandled CancelledKeyException
during processPendingInterestOps leads to a shutdown of the underlying
IOReactor
[ https://issues.apache.org/jira/browse/HTTPCORE-695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17438875#comment-17438875 ]
Gary D. Gregory commented on HTTPCORE-695:
------------------------------------------
Does this happen using 4.4.14?
> Unhandled CancelledKeyException during processPendingInterestOps leads to a shutdown of the underlying IOReactor
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HTTPCORE-695
> URL: https://issues.apache.org/jira/browse/HTTPCORE-695
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.4.10
> Environment: Oracle Java 11.0.9.0.2 on Linux 3.10.0-1127.19.1.el7.x86_64
> Reporter: Kurtcebe Eroglu
> Priority: Major
>
> An unhandled {{java.nio.channels.CancelledKeyException}} in AbstractIOReactor#processPendingInterestOps() leads to a shutdown of the underlying IOReactor. This is very similar to HTTPCORE-336.
> This happens regularly under non-reproducible circumstances, producing the following stack trace in the logs;
> {noformat}
> 2021-10-12 00:22:19,326-0400 httpclient-io:thread-1 ERROR anonymous [o.a.h.i.nio.client.InternalHttpAsyncClient] I/O reactor terminated abnormally
> org.apache.http.nio.reactor.IOReactorException: I/O dispatch worker terminated abnormally
> at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:356)
> at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:221)
> at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64)
> at java.base/java.lang.Thread.run(Thread.java:834)
> Caused by: java.nio.channels.CancelledKeyException
> at java.base/sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:71)
> at java.base/sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:96)
> at org.apache.http.impl.nio.reactor.AbstractIOReactor.processPendingInterestOps(AbstractIOReactor.java:459)
> at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:298)
> at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
> at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:588)
> {noformat}
> The problem happens at {{AbstractIOReactor#processPendingInterestOps()}}. Even if we check {{key.isValid()}} in the loop before processing, apparently we may still observe a {{CancelledKeyException}} during {{key.interestOps(eventMask)}}. Following patch may help this condition, following from similar check at method {{processClosedSessions()}} ;
> {code:java}
> Index: httpcore-nio/src/main/java/org/apache/http/impl/nio/reactor/AbstractIOReactor.java
> ===================================================================
> --- httpcore-nio/src/main/java/org/apache/http/impl/nio/reactor/AbstractIOReactor.java (revision 975b373b6e0431ba8f58abe004039f925703a808)
> +++ httpcore-nio/src/main/java/org/apache/http/impl/nio/reactor/AbstractIOReactor.java (date 1636046242908)
> @@ -456,7 +456,11 @@
> final SelectionKey key = entry.getSelectionKey();
> final int eventMask = entry.getEventMask();
> if (key.isValid()) {
> - key.interestOps(eventMask);
> + try {
> + key.interestOps(eventMask);
> + } catch (CancelledKeyException ex) {
> + // ignore and move on
> + }
> }
> }
> }
> {code}
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