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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16005) NativeAzureFileSystem does not support setXAttr
Date Fri, 22 Feb 2019 19:18:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775524#comment-16775524
] 

Steve Loughran commented on HADOOP-16005:
-----------------------------------------

[~c-w] looks like your test running JVM crashed. There might be something in the -output file;
sadly the XML DOM gets buffered until the process exits cleanly. 

> NativeAzureFileSystem does not support setXAttr
> -----------------------------------------------
>
>                 Key: HADOOP-16005
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16005
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure
>            Reporter: Clemens Wolff
>            Assignee: Clemens Wolff
>            Priority: Major
>
> When interacting with Azure Blob Storage via the Hadoop FileSystem client, it's currently
(as of [a8bbd81|https://github.com/apache/hadoop/commit/a8bbd818d5bc4762324bcdb7cf1fdd5c2f93891b])
not possible to set custom metadata attributes.
> Here is a snippet that demonstrates the missing behavior (throws an UnsupportedOperationException):
> {code:java}
> val blobAccount = "SET ME"
> val blobKey = "SET ME"
> val blobContainer = "SET ME"
> val blobFile = "SET ME"
> import org.apache.hadoop.conf.Configuration
> import org.apache.hadoop.fs.{FileSystem, Path}
> val conf = new Configuration()
> conf.set("fs.wasbs.impl", "org.apache.hadoop.fs.azure.NativeAzureFileSystem")
> conf.set(s"fs.azure.account.key.$blobAccount.blob.core.windows.net", blobKey)
> val path = new Path(s"wasbs://$blobContainer@$blobAccount.blob.core.windows.net/$blobFile")
> val fs = FileSystem.get(path, conf)
> fs.setXAttr(path, "somekey", "somevalue".getBytes)
> {code}
> Looking at the code in hadoop-tools/hadoop-azure, NativeAzureFileSystem inherits the
default setXAttr from FileSystem which throws the UnsupportedOperationException.
> The underlying Azure Blob Storage service does support custom metadata ([service docs|https://docs.microsoft.com/en-us/azure/storage/blobs/storage-properties-metadata])
as does the azure-storage SDK that's being used by NativeAzureFileSystem ([SDK docs|http://javadox.com/com.microsoft.azure/azure-storage/2.0.0/com/microsoft/azure/storage/blob/CloudBlob.html#setMetadata(java.util.HashMap)]).
> Is there another way that I should be setting custom metadata on Azure Blob Storage files?
Is there a specific reason why setXAttr hasn't been implemented on NativeAzureFileSystem?
If not, I can take a shot at implementing it.



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