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https://issues.apache.org/jira/browse/TAJO-976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14077379#comment-14077379
]
Hudson commented on TAJO-976:
-----------------------------
FAILURE: Integrated in Tajo-master-build #319 (See
[https://builds.apache.org/job/Tajo-master-build/319/])
TAJO-976: HashPartitioner doesn't make desired number of partitions
infrequently. (Hyoungjun Kim via hyunsik) (hyunsik: rev
8be501f43fc1b20c2a57790259aceafb02987df5)
*
tajo-core/src/test/resources/results/TestJoinBroadcast/testBroadcastMultiColumnPartitionTable.result
*
tajo-core/src/test/resources/queries/TestGroupByQuery/testGroupByWithSameExprs1.sql
*
tajo-core/src/main/java/org/apache/tajo/engine/planner/physical/HashPartitioner.java
* tajo-common/src/main/java/org/apache/tajo/datum/Float8Datum.java
*
tajo-core/src/test/resources/queries/TestGroupByQuery/testHavingWithNamedTarget.sql
* tajo-common/src/main/java/org/apache/tajo/util/MurmurHash.java
* tajo-common/src/main/java/org/apache/tajo/datum/Int4Datum.java
*
tajo-core/src/test/resources/queries/TestGroupByQuery/testGroupByWithSameExprs2.sql
* tajo-core/src/test/java/org/apache/tajo/engine/query/TestGroupByQuery.java
*
tajo-core/src/test/resources/queries/TestGroupByQuery/testGroupByWithSameConstantKeys1.sql
* tajo-core/src/test/java/org/apache/tajo/engine/query/TestJoinBroadcast.java
*
tajo-core/src/test/resources/results/TestGroupByQuery/testHavingWithNamedTarget.result
* tajo-core/src/test/resources/results/TestGroupByQuery/testGroupBy2.result
*
tajo-core/src/test/resources/results/TestGroupByQuery/testGroupByWithSameConstantKeys1.result
* tajo-common/src/main/java/org/apache/tajo/datum/TextDatum.java
*
tajo-core/src/test/resources/results/TestGroupByQuery/testGroupbyWithJson.result
*
tajo-core/src/test/java/org/apache/tajo/engine/planner/physical/TestHashPartitioner.java
* tajo-common/src/main/java/org/apache/tajo/datum/Int2Datum.java
* tajo-common/src/main/java/org/apache/tajo/datum/Float4Datum.java
* tajo-common/src/main/java/org/apache/tajo/datum/Int8Datum.java
> HashPartitioner doesn't make desired number of partitions infrequently.
> -----------------------------------------------------------------------
>
> Key: TAJO-976
> URL: https://issues.apache.org/jira/browse/TAJO-976
> Project: Tajo
> Issue Type: Improvement
> Reporter: Hyoungjun Kim
> Assignee: Hyoungjun Kim
> Priority: Minor
>
> If the number desired partition is a multiples of 31, HashPartitioner doesn't
> make desired number of partitions. I tested with the following code.
> {code}
> Random rand = new Random();
> String[][] data = new String[1000][];
> for (int i = 0; i < 1000; i++) {
> data[i] = new String[]{ String.valueOf(rand.nextInt(1000)),
> String.valueOf(rand.nextInt(1000)), String.valueOf(rand.nextInt(1000))};
> }
> int[] testNumPartitions = new int[]{31, 62, 124, 32, 63, 125};
> for (int index = 0; index < testNumPartitions.length; index++) {
> Set<Integer> ids = new TreeSet<Integer>();
> for (int i = 0; i < data.length; i++) {
> VTuple vtuple = new VTuple(new Datum[]{new TextDatum(data[i][0]), new
> TextDatum(data[i][1]), new TextDatum(data[i][2])});
> int hashValue = vtuple.hashCode();
> int partitionId = (hashValue & Integer.MAX_VALUE) %
> testNumPartitions[index];
> ids.add(partitionId);
> }
> System.out.println("Expected partition num: " + testNumPartitions[index] +
> ", real partition num:" + ids.size());
> }
> {code}
> {noformat}
> Expected partition num: 31, real partition num:10
> Expected partition num: 62, real partition num:20
> Expected partition num: 124, real partition num:40
> Expected partition num: 32, real partition num:32
> Expected partition num: 63, real partition num:63
> Expected partition num: 125, real partition num:125
> {noformat}
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