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https://issues.apache.org/jira/browse/HDFS-9814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17180707#comment-17180707
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Dinesh S. Atreya commented on HDFS-9814:
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Now Hadoop Distributed Data Store is an active effort, starting with _Hadoop
Distributed Storage Layer (HDSL)_ HDFS-7240, *Ozone File System* (aka Hadoop
Distributed Data Store) HDFS-13074 after formally being named with *Ozone:
Rename HDSL to HDDS* HDFS-13405.
Ozone is built on a highly available, replicated block storage layer called
Hadoop Distributed Data Store (HDDS) and is S3 compatible. Ozone can function
effectively in containerized environments such as _*Kubernetes*_ and _*YARN*_.
Ozone supports different protocols like S3 and Hadoop File System APIs.
Work on this JIRA and related JIRAs are using HDDS/Ozone as a base given HDFS
enhancements to work on top of HDDS.
> Advance Hadoop Architecture (AHA) - HDFS Block Level Leases (Locks)
> -------------------------------------------------------------------
>
> Key: HDFS-9814
> URL: https://issues.apache.org/jira/browse/HDFS-9814
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Dinesh S. Atreya
> Priority: Major
>
> Link to Umbrella JIRA https://issues.apache.org/jira/browse/HADOOP-12620
> See
> https://issues.apache.org/jira/browse/HADOOP-12620?focusedCommentId=15046300&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15046300
> for more details.
> Currently, only file level leases (locks) are supported. This JIRA is for
> expanding the capability to allow block level leases (locks).
> Block level leases presume that Block Manager as a Service (reference JIRA
> https://issues.apache.org/jira/browse/HDFS-5477) solution is available.
> File level leases are default. When block level leases are requested, they
> will supersede file level leases and lease (lock) capability will advance to
> block levels. In the absence of block level leases, leases degenerate into
> file level leases.
> If we correspond to DBMS paradigm, file level leases amount to table locks;
> while row level locks are not possible with HDFS, the closest we can get to
> is block level leases (locks).
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