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From "ChenFolin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10472) NameNode Rpc Reader Thread crash, and cluster hang.
Date Tue, 31 May 2016 07:08:12 GMT
ChenFolin created HDFS-10472:
--------------------------------

             Summary: NameNode Rpc Reader Thread crash, and cluster hang.
                 Key: HDFS-10472
                 URL: https://issues.apache.org/jira/browse/HDFS-10472
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs, namenode
    Affects Versions: 2.6.4, 2.6.2, 2.7.2, 2.6.0, 2.5.0, 2.8.0
            Reporter: ChenFolin


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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