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Posted to common-issues@hadoop.apache.org by "Andrei Savu (JIRA)" <ji...@apache.org> on 2014/01/04 00:17:50 UTC
[jira] [Updated] (HADOOP-10203) Connection leak in
Jets3tNativeFileSystemStore#retrieveMetadata
[ https://issues.apache.org/jira/browse/HADOOP-10203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrei Savu updated HADOOP-10203:
---------------------------------
Attachment: HADOOP-10203.patch
The attached patch fixes the problem by adding a finalize block. I've also changed the implementation to use a HEAD request rather than attempt an expensive full file download.
> 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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