[jira] [Updated] (CASSANDRA-5519) Reduce index summary memory use for cold sstables

2013-11-21 Thread Tyler Hobbs (JIRA) 

 [ 
https://issues.apache.org/jira/browse/CASSANDRA-5519?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Tyler Hobbs updated CASSANDRA-5519:
---

Attachment: 5519-v1.txt

[~jbellis] Attached patch 5519-v1.txt includes your suggested changes.  (My 
CASSANDRA-5519 branch is still good, as well.)

 Reduce index summary memory use for cold sstables
 -

 Key: CASSANDRA-5519
 URL: https://issues.apache.org/jira/browse/CASSANDRA-5519
 Project: Cassandra
  Issue Type: Bug
  Components: Core
Reporter: Jonathan Ellis
Assignee: Tyler Hobbs
Priority: Minor
 Fix For: 2.1

 Attachments: 5519-v1.txt, downsample.py






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[jira] [Updated] (CASSANDRA-5519) Reduce index summary memory use for cold sstables

2013-10-22 Thread Tyler Hobbs (JIRA) 

 [ 
https://issues.apache.org/jira/browse/CASSANDRA-5519?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Tyler Hobbs updated CASSANDRA-5519:
---

Attachment: downsample.py

The attached downsample.py script demonstrates the downsampling algorithm.  
It's a touch complex, but it would be easy to precompute or cache the 
downsampling patterns if needed.

An example run with an original index summary size of 16 and a resolution of 
8, meaning each minimal downsample run will remove 1/8th of the original 
points.  The top row is the original index summary and each row below that 
represents one downsampling run:

{noformat}
~ $ ./downsample.py 16 8
  0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
  1   2   3   4   5   6   7   9  10  11  12  13  14  15
  1   2   3   5   6   7   9  10  11  13  14  15
  1   3   5   6   7   9  11  13  14  15
  1   3   5   7   9  11  13  15
  3   5   7  11  13  15
  3   7  11  15
{noformat}

 Reduce index summary memory use for cold sstables
 -

 Key: CASSANDRA-5519
 URL: https://issues.apache.org/jira/browse/CASSANDRA-5519
 Project: Cassandra
  Issue Type: Bug
  Components: Core
Reporter: Jonathan Ellis
Assignee: Tyler Hobbs
Priority: Minor
 Fix For: 2.1

 Attachments: downsample.py






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[jira] [Updated] (CASSANDRA-5519) Reduce index summary memory use for cold sstables

2013-09-28 Thread Jonathan Ellis (JIRA) 

 [ 
https://issues.apache.org/jira/browse/CASSANDRA-5519?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Jonathan Ellis updated CASSANDRA-5519:
--

Fix Version/s: (was: 2.0.2)
   2.1

 Reduce index summary memory use for cold sstables
 -

 Key: CASSANDRA-5519
 URL: https://issues.apache.org/jira/browse/CASSANDRA-5519
 Project: Cassandra
  Issue Type: Bug
  Components: Core
Reporter: Jonathan Ellis
Assignee: Tyler Hobbs
Priority: Minor
 Fix For: 2.1




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[jira] [Updated] (CASSANDRA-5519) Reduce index summary memory use for cold sstables

2013-06-19 Thread Jonathan Ellis (JIRA) 

 [ 
https://issues.apache.org/jira/browse/CASSANDRA-5519?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Jonathan Ellis updated CASSANDRA-5519:
--

Fix Version/s: (was: 2.0 beta 1)
   2.0.1

 Reduce index summary memory use for cold sstables
 -

 Key: CASSANDRA-5519
 URL: https://issues.apache.org/jira/browse/CASSANDRA-5519
 Project: Cassandra
  Issue Type: Bug
  Components: Core
Reporter: Jonathan Ellis
Priority: Minor
 Fix For: 2.0.1




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