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https://issues.apache.org/jira/browse/HADOOP-13219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15309193#comment-15309193
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ChenFolin commented on HADOOP-13219:
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Hi,
Because not set UncaughtExceptionHandler for Reader thread, so i do not know
what kind of exception.
I see there was no Reader Thread at NameNode jvm stack , and Namenode gc log :
[ParNew: 19752861K->88868K(22118400K), 0.1060980 secs]
89096996K->69442056K(128614400K), 0.1062910 secs] [Times: user=3.72 sys=0.00,
real=0.10 secs]
So i do not think it is a OutOfMemoryError.
Thanks.
> NameNode Rpc Reader Thread crash, and cluster hang.
> ---------------------------------------------------
>
> Key: HADOOP-13219
> URL: https://issues.apache.org/jira/browse/HADOOP-13219
> Project: Hadoop Common
> Issue Type: Bug
> Components: rpc-server
> Affects Versions: 2.5.0, 2.6.0, 2.8.0, 2.7.2, 2.6.2, 2.6.4
> Reporter: ChenFolin
> Labels: patch
> Attachments: HADOOP-13219-3.patch, HDFS-10472-2.patch,
> HDFS-10472.patch
>
>
> My Cluster hang yesterday .
> Becuase the rpc server Reader threads crash. So all rpc request timeout,
> include datanode hearbeat &.
> We can see , the method doRunLoop just catch InterruptedException and
> IOException:
> while (running) {
> SelectionKey key = null;
> try {
> // consume as many connections as currently queued to avoid
> // unbridled acceptance of connections that starves the select
> int size = pendingConnections.size();
> for (int i=size; i>0; i--) {
> Connection conn = pendingConnections.take();
> conn.channel.register(readSelector, SelectionKey.OP_READ, conn);
> }
> readSelector.select();
> Iterator<SelectionKey> iter =
> readSelector.selectedKeys().iterator();
> while (iter.hasNext()) {
> key = iter.next();
> iter.remove();
> if (key.isValid()) {
> if (key.isReadable()) {
> doRead(key);
> }
> }
> key = null;
> }
> } catch (InterruptedException e) {
> if (running) { // unexpected -- log it
> LOG.info(Thread.currentThread().getName() + " unexpectedly
> interrupted", e);
> }
> } catch (IOException ex) {
> LOG.error("Error in Reader", ex);
> }
> }
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