GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/2093
[SPARK-2871] [PySpark] add RDD.lookup(key)
RDD.lookup(key)
Return the list of values in the RDD for key `key`. This operation
is done efficiently if the RDD has a known partitioner by only
searching the partition that the key maps to.
>>> l = range(1000)
>>> rdd = sc.parallelize(zip(l, l), 10)
>>> rdd.lookup(42) # slow
[42]
>>> sorted = rdd.sortByKey()
>>> sorted.lookup(42) # fast
[42]
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark lookup
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/2093.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2093
----
commit eb1305df44e030b086ca3cf518bdda3bef772109
Author: Davies Liu <[email protected]>
Date: 2014-08-22T04:48:50Z
add RDD.lookup(key)
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