mapreduce - Hadoop MR - HLL : Union of two different size HLL is throwing exception -


i'm using hll in mapreduce code. in combiner side, hll size of log2m=8, registerwidth=8 used store data. on reducer side, hll size of log2m=26, registerwidth=8 used union map side hll. i'm getting exception when trying union. 2 questions are, 1) possible union 2 different size hll? 2) if answer question 1 yes, missing?

combiner: hll maphll = new hll(8,8) ; maphll.addraw(murmurhash64(userid));  valueobject.sethll(maphll);  reducer: hll reducehll = new hll(26,8) ; for(iterator itr : values){ reduerhll.union(itr.gethll()); }

also, i'm using hll tobytes & frombytes method serializing hll data.

below exception stack trace, 17/04/06 10:56:20 info mapreduce.job: task id : attempt_1490152294761_13920_r_000040_1, status : failed error: java.lang.arrayindexoutofboundsexception: 4512149     @ net.agkn.hll.util.bitvector.setmaxregister(bitvector.java:201)     @ net.agkn.hll.hll.addrawprobabilistic(hll.java:466)     @ net.agkn.hll.hll.addraw(hll.java:373)     @ net.agkn.hll.hll.heterogenousunion(hll.java:747)     @ net.agkn.hll.hll.union(hll.java:634)     @ com.yumecorp.yfa.yfaimsuniqueviewerhllmr$yfaimsuniqueviewerhllreducer.reduce(yfaimsuniqueviewerhllmr.java:338)     @ com.yumecorp.yfa.yfaimsuniqueviewerhllmr$yfaimsuniqueviewerhllreducer.reduce(yfaimsuniqueviewerhllmr.java:1)     @ org.apache.hadoop.mapreduce.reducer.run(reducer.java:171)     @ org.apache.hadoop.mapred.reducetask.runnewreducer(reducetask.java:627)     @ org.apache.hadoop.mapred.reducetask.run(reducetask.java:389)     @ org.apache.hadoop.mapred.yarnchild$2.run(yarnchild.java:164)     @ java.security.accesscontroller.doprivileged(native method)     @ javax.security.auth.subject.doas(subject.java:415)     @ org.apache.hadoop.security.usergroupinformation.doas(usergroupinformation.java:1707)     @ org.apache.hadoop.mapred.yarnchild.main(yarnchild.java:158

let me know if additional information required flavor of issue.


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