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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