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https://issues.apache.org/jira/browse/HDFS-9814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dinesh S. Atreya updated HDFS-9814:
-----------------------------------
Description:
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).
This JIRA is within the broad initiative:
Advance Hadoop Architecture (AHA) / Advance Hadoop Adaptabilities (AHA) /
Advance Hybrid Cloud Architecture (AHA)
was:
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).
> 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).
>
> This JIRA is within the broad initiative:
> Advance Hadoop Architecture (AHA) / Advance Hadoop Adaptabilities (AHA) /
> Advance Hybrid Cloud Architecture (AHA)
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