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Posted to issues@spark.apache.org by "Elazar Gershuni (JIRA)" <ji...@apache.org> on 2016/01/04 20:31:39 UTC
[jira] [Updated] (SPARK-12623) map key_values to values
[ https://issues.apache.org/jira/browse/SPARK-12623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Elazar Gershuni updated SPARK-12623:
------------------------------------
Description:
Why doesn't the argument to mapValues() take a key as an agument? Alternatively, can we have a "mapKeyValuesToValues" that does?
Use case: I want to write a simpler analyzer that takes the argument to map(), and analyze it to see whether it (trivially) doesn't change the key, e.g.
g = lambda kv: (kv[0], f(kv[0], kv[1]))
rdd.map(g)
Problem is, if I find that it is the case, I can't call mapValues() with that function, as in `rdd.mapValues(lambda kv: g(kv)[1])`, since mapValues receives only `v` as an argument.
was:
Why doesn't the argument to mapValues() take a key as an agument? Alternatively, can we have a "mapKeyValuesToValues" that does?
Use case: I want to write a simpler analyzer that takes the argument to map(), and analyze it to see whether it (trivially) doesn't change the key, e.g.
g = lambda kv: (kv[0], f(kv[0], kv[1])
rdd.map(g)
Problem is, if I find that it is the case, I can't call mapValues() with that function, as in `rdd.mapValues(lambda kv: g(kv)[1])`, since mapValues receives only `v` as an argument.
> map key_values to values
> ------------------------
>
> Key: SPARK-12623
> URL: https://issues.apache.org/jira/browse/SPARK-12623
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Reporter: Elazar Gershuni
> Priority: Minor
> Labels: easyfix, features, performance
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> Why doesn't the argument to mapValues() take a key as an agument? Alternatively, can we have a "mapKeyValuesToValues" that does?
> Use case: I want to write a simpler analyzer that takes the argument to map(), and analyze it to see whether it (trivially) doesn't change the key, e.g.
> g = lambda kv: (kv[0], f(kv[0], kv[1]))
> rdd.map(g)
> Problem is, if I find that it is the case, I can't call mapValues() with that function, as in `rdd.mapValues(lambda kv: g(kv)[1])`, since mapValues receives only `v` as an argument.
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