hash - Spark: Force two RDD[Key, Value] with co-located partitions using custom partitioner -


i have 2 rdd[k,v], k=long , v=object. lets call rdd1 , rdd2. have common custom partitioner. trying find way take union or join avoiding or minimizing data movement. 

val kafkardd1 = /* kafka sources */ val kafkardd2 = /* kafka sources */  val rdd1 = kafkardd1.partitionby(new mycustompartitioner(24)) val rdd2 = kafkardd2.partitionby(new mycustompartitioner(24))  val rdd3 = rdd1.union(rdd2) // without shuffle val rdd3 = rdd1.leftouterjoin(rdd2) // without shuffle

is safe assume (or way enforce) nth-partition of both rdd1 , rdd2 on same slave node?

it not possible enforce* colocation in spark method use minimize data movement. when partitionerawareunionrdd created input rdds analyzed choose optimal output locations based on number of records per location. see getpreferredlocations method details.

* according high performance spark

two rdds colocated if have same partitioner , shuffled part of same action.


Comments

Post a Comment

Popular posts from this blog

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^...
Read more

Unlimited choices in BASH case statement -

consider simple bash snippet: case $option in 1) image=${options[0]%.tar} ;; 2) image=${options[1]%.tar} ;; 3) image=${options[2]%.tar} ;; 4) image=${options[3]%.tar} ;; *) echo "invalid option" exit 1 esac in real script numbers goes 30. makes pretty long. can somehow specify cases variable? something this: case $option in $i) image=${options[$(($i-1))]%.tar} any pointer appreciated. you can match against multiple patterns in single clause: case $option in 1|2|3: echo "$option one, 2 or three" ;; esac if still typing you, can use simple pattern matching: case $option in # following matches # - single-digit numbers 0-9 # - two-digit numbers starting either 1 or 2 # - number 30 [0-9]|[12][0-9]|30) image=${options[$(($option-1))]%.tar} ;; *) echo "invalid option" 1>&2 exit 1 esac
Read more

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in...
Read more