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Colin Patrick McCabe commented on HDFS-7570:
--------------------------------------------
Juan, this is deliberate to allow the DataXceiver to transfer the file descriptor to other
parts of the code. This is used in short-circuit.
> DataXceiver could leak FileDescriptor
> -------------------------------------
>
> Key: HDFS-7570
> URL: https://issues.apache.org/jira/browse/HDFS-7570
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Juan Yu
>
> DataXceiver doesn't close inputstream all the time, There could be FD leakage and overtime
cause FDs exceed limit.
> {code}
> finally {
> if (LOG.isDebugEnabled()) {
> LOG.debug(datanode.getDisplayName() + ":Number of active connections is: "
> + datanode.getXceiverCount());
> }
> updateCurrentThreadName("Cleaning up");
> if (peer != null) {
> dataXceiverServer.closePeer(peer);
> IOUtils.closeStream(in);
> }
> }
> {code}
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