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Posted to dev@ignite.apache.org by "Vladimir Ozerov (JIRA)" <ji...@apache.org> on 2015/09/25 12:21:04 UTC
[jira] [Created] (IGNITE-1548) Optimize portable object header.
Vladimir Ozerov created IGNITE-1548:
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Summary: Optimize portable object header.
Key: IGNITE-1548
URL: https://issues.apache.org/jira/browse/IGNITE-1548
Project: Ignite
Issue Type: Task
Components: general
Affects Versions: 1.1.4
Reporter: Vladimir Ozerov
Priority: Blocker
Fix For: ignite-1.5
Currently portable object header takes 18 bytes:
1 - object type
1 - user flag
4 - type ID
4 - hash code
4 - length
4 - raw offset.
The following optimizations can be applied:
1) User flag can be easilty merged into object type. (-1 byte)
2) In most cases only length or raw-offset exists, but not both. Remove one of them and encode state into the object type. (-4 bytes)
3) Length usually fit in 1-2 bytes. Encode it with "variable bytes" algo (-2-3 bytes).
As a result we will shrink header size from 18 to 10-11 bytes. Encoded states will require 6 additional object types:
104 => system, with length
105 => system, with raw offset
106 => system, with both
107, 108, 109 - the same, but for user types.
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