Todd Lipcon created HDFS-3359:
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Summary: DFSClient.close should close cached sockets
Key: HDFS-3359
URL: https://issues.apache.org/jira/browse/HDFS-3359
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs client
Affects Versions: 0.22.0, 2.0.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Critical
Some applications like the TT/JT (pre-2.0) and probably the RM/NM cycle through DistributedFileSystem
objects reasonably frequently. So long as they call close() it isn't a big problem, except
that currently DFSClient.close() doesn't explicitly close the SocketCache. So unless a full
GC runs (causing the references to get finalized), many SocketCaches can get orphaned, each
with many open sockets inside. We should fix the close() function to close all cached sockets.
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