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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