[jira] [Updated] (IGNITE-14769) Key hash calculation.

["Andrey Mashenkov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-14769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrey Mashenkov updated IGNITE-14769:
--------------------------------------
    Description: 
There are next possible ways for cache calculation.
 # Update hash on every write method call as it works for now.
 # Calculate for all key chunk (hash of byte[]) - all columns including a null-map.

Let's choose and implement the best way and along with a better hash function,
 e.g. xxHash64 [1], Murmur3 [2]released in Apache Commons, CityHash (from Google) [3], FastHash32 [4].

 

[1][https://github.com/Cyan4973/xxHash/]

[2]https://commons.apache.org/proper/commons-codec/jacoco/org.apache.commons.codec.digest/MurmurHash3.java.html

[3] [https://github.com/google/cityhash]

[4] https://github.com/rurban/smhasher/blob/master/fasthash.cpp

  was:
There are next possible ways for cache calculation.
 # Update hash on every write method call as it works for now.
 # Calculate hash for serialized column values, but excluding a null-map) (hash of byte[])
 # Calculate for all key chunk (hash of byte[]) - all columns including a null-map.

Let's choose and implement the best way and along with a better hash function,
 e.g. xxHash64 [1], Murmur3 [2]released in Apache Commons, CityHash (from Google) [3], FastHash32 [4].

 

[1][https://github.com/Cyan4973/xxHash/]

[2]https://commons.apache.org/proper/commons-codec/jacoco/org.apache.commons.codec.digest/MurmurHash3.java.html

[3] [https://github.com/google/cityhash]

[4] https://github.com/rurban/smhasher/blob/master/fasthash.cpp


> Key hash calculation.
> ---------------------
>
>                 Key: IGNITE-14769
>                 URL: https://issues.apache.org/jira/browse/IGNITE-14769
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Andrey Mashenkov
>            Assignee: Konstantin Orlov
>            Priority: Major
>              Labels: iep-54, ignite-3
>   Original Estimate: 96h
>  Remaining Estimate: 96h
>
> There are next possible ways for cache calculation.
>  # Update hash on every write method call as it works for now.
>  # Calculate for all key chunk (hash of byte[]) - all columns including a null-map.
> Let's choose and implement the best way and along with a better hash function,
>  e.g. xxHash64 [1], Murmur3 [2]released in Apache Commons, CityHash (from Google) [3], FastHash32 [4].
>  
> [1][https://github.com/Cyan4973/xxHash/]
> [2]https://commons.apache.org/proper/commons-codec/jacoco/org.apache.commons.codec.digest/MurmurHash3.java.html
> [3] [https://github.com/google/cityhash]
> [4] https://github.com/rurban/smhasher/blob/master/fasthash.cpp



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