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https://issues.apache.org/jira/browse/HADOOP-12635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth updated HADOOP-12635:
-----------------------------------
Release Note: The Azure Blob Storage file system (WASB) now includes
optional support for use of the append API by a single writer on a path.
Please note that the implementation differs from the semantics of HDFS append.
HDFS append internally guarantees that only a single writer may append to a
path at a given time. WASB does not enforce this guarantee internally.
Instead, the application must enforce access by a single writer, such as by
running single-threaded or relying on some external locking mechanism to
coordinate concurrent processes. Refer to the Azure Blob Storage documentation
page for more details on enabling append in configuration. (was: The Azure
Blob Storage file system (WASB) now includes optional support for use of the
append API by a single writer on a path. Please note that the implementation
differs from the semantics of HDFS append. HDFS append internally guarantees
that only a single writer may append to a path at a given time. WASB does not
enforce this guarantee internally. Instead, the application must enforce
access by a single writer, such as by running single-threaded or relying on
some external locking mechanism to coordinate concurrent processes.)
> Adding Append API support for WASB
> ----------------------------------
>
> Key: HADOOP-12635
> URL: https://issues.apache.org/jira/browse/HADOOP-12635
> Project: Hadoop Common
> Issue Type: New Feature
> Components: azure
> Affects Versions: 2.7.1
> Reporter: Dushyanth
> Assignee: Dushyanth
> Fix For: 2.8.0
>
> Attachments: Append API.docx, HADOOP-12635-004.patch,
> HADOOP-12635.001.patch, HADOOP-12635.002.patch, HADOOP-12635.003.patch,
> HADOOP-12635.005.patch, HADOOP-12635.006.patch, HADOOP-12635.007.patch
>
>
> Currently the WASB implementation of the HDFS interface does not support
> Append API. This JIRA is added to design and implement the Append API support
> to WASB. The intended support for Append would only support a single writer.
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