Andrei Savu created HADOOP-10203:
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Summary: Connection leak in
Jets3tNativeFileSystemStore#retrieveMetadata
Key: HADOOP-10203
URL: https://issues.apache.org/jira/browse/HADOOP-10203
Project: Hadoop Common
Issue Type: Bug
Components: fs/s3
Environment: CDH 2.0.0-cdh4.5.0
(30821ec616ee7a21ee8447949b7c6208a8f1e7d8)
Reporter: Andrei Savu
Attachments: HADOOP-10203.patch
Jets3tNativeFileSystemStore#retrieveMetadata is leaking connections.
This affects any client that tries to read many small files very quickly (e.g.
distcp from s3 to hdfs with small files blocks due to connection pool
starvation).
This is not a problem for larger files because when the GC runs any connection
that's out of scope will be released in #finalize().
We are seeing the following log messages as a symptom of this problem:
{noformat}
13/12/26 13:40:01 WARN httpclient.HttpMethodReleaseInputStream: Attempting to
release HttpMethod in finalize() as its response data stream has gone out of
scope. This attempt will not always succeed and cannot be relied upon! Please
ensure response data streams are always fully consumed or closed to avoid HTTP
connection starvation.
13/12/26 13:40:01 WARN httpclient.HttpMethodReleaseInputStream: Successfully
released HttpMethod in finalize(). You were lucky this time... Please ensure
response data streams are always fully consumed or closed.
{noformat}
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