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https://issues.apache.org/jira/browse/HADOOP-16005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16722876#comment-16722876
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Steve Loughran commented on HADOOP-16005:
-----------------------------------------
I should add: serving up the etag as the file checksum would be nice —lets you
do backups which use a change in the etag as the sign of a file being out of
date
Look at
* class to describe the etag
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/store/EtagChecksum.java
*HADOOP-13282 is the change to S3A to add this; HADOOP-15287 the discovery
we'd better make it optional to stop distcp backups from HDFS failing, as too
many jobs weren't using {{-skipCrc}} on the command line, it
> NativeAzureFileSystem does not support setXAttr
> -----------------------------------------------
>
> Key: HADOOP-16005
> URL: https://issues.apache.org/jira/browse/HADOOP-16005
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/azure
> Reporter: 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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