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Posted to dev@flume.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2017/08/14 22:51:00 UTC
[jira] [Updated] (FLUME-3146) Use public API
HdfsDataOutputStream#getCurrentBlockReplication where applicable
[ https://issues.apache.org/jira/browse/FLUME-3146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wei-Chiu Chuang updated FLUME-3146:
-----------------------------------
Attachment: FLUME-3146.001.patch
Attach my rev 001 patch that does not have test:
* If the outputstream is a HdfsDataOutputStream object, do not attempt to use reflection to find getNumCurrentReplicas() method.
* In such case, AbstractHDFSWriter#getNumCurrentReplicas calls HdfsDataOutputStream#getCurrentBlockReplication.
> Use public API HdfsDataOutputStream#getCurrentBlockReplication where applicable
> -------------------------------------------------------------------------------
>
> Key: FLUME-3146
> URL: https://issues.apache.org/jira/browse/FLUME-3146
> Project: Flume
> Issue Type: Bug
> Reporter: Wei-Chiu Chuang
> Attachments: FLUME-3146.001.patch
>
>
> AbstractHDFSWrite#reflectGetNumCurrentReplicas uses a private HDFS API, which causes it to emit an confusing error message:
> {noformat}
> 2017-08-08 22:01:10,743 INFO org.apache.flume.sink.hdfs.AbstractHDFSWriter: FileSystem's output stream doesn't support getNumCurrentReplicas; --HDFS-826 not available; fsOut=org.apache.hadoop.crypto.CryptoOutputStream; err=java.lang.NoSuchMethodException: org.apache.hadoop.crypto.CryptoOutputStream.getNumCurrentReplicas()
> 2017-08-08 22:02:11,086 ERROR org.apache.flume.sink.hdfs.AbstractHDFSWriter: Error while trying to hflushOrSync!
> {noformat}
> This error message is emitted even with the most recent version of HDFS that has HDFS-826 for sure.
> Turns out that the relevant code is not valid with HDFS encryption. Instead of using the current private (and deprecated) getNumCurrentReplicas#getNumCurrentReplicas() API, it should use HdfsDataOutputStream#getCurrentBlockReplication, which is a public API and which considers the case of HDFS encryption.
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