[jira] [Created] (HDFS-9814) Advance Hadoop Architecture (AHA) - HDFS Block Level Leases (Locks)

["Dinesh S. Atreya (JIRA)" <ji...@apache.org>]

Dinesh S. Atreya created HDFS-9814:
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             Summary: 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


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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