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[GitHub] [pinot] Jackie-Jiang opened a new pull request #8221: Ensure partition function never return negative partition

Jackie-Jiang opened a new pull request #8221:
URL: https://github.com/apache/pinot/pull/8221


   There are some corner cases not handled in partition function which can lead to negative partition:
   - In HashCodePartitionFunction when hashcode is Integer.MIN_VALUE
   - In ModuloPartitionFunction when value is negative
   
   Also enhance the test to ensure passing number and string returns the same result


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[GitHub] [pinot] snleee commented on pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
snleee commented on pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#issuecomment-1045345513


   If this is a backward incompatible change (especially for`ModuloPartitionFunction`), please tag accordingly.  


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[GitHub] [pinot] codecov-commenter commented on pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
codecov-commenter commented on pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#issuecomment-1043733376


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   > Merging [#8221](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (b316b73) into [master](https://codecov.io/gh/apache/pinot/commit/582d621e2a07f605ecd1edac7f97c65ade3a2d41?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (582d621) will **decrease** coverage by `50.19%`.
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   ```diff
   @@              Coverage Diff              @@
   ##             master    #8221       +/-   ##
   =============================================
   - Coverage     64.28%   14.09%   -50.20%     
   + Complexity     4312       81     -4231     
   =============================================
     Files          1581     1581               
     Lines         83122    83120        -2     
     Branches      12587    12587               
   =============================================
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   - Misses        25852    70533    +44681     
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[GitHub] [pinot] Jackie-Jiang commented on a change in pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on a change in pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#discussion_r810305567



##########
File path: pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/partition/ByteArrayPartitionFunction.java
##########
@@ -40,8 +42,8 @@ public ByteArrayPartitionFunction(int numPartitions) {
   }
 
   @Override
-  public int getPartition(Object valueIn) {
-    return abs(Arrays.hashCode(valueIn.toString().getBytes())) % _numPartitions;
+  public int getPartition(Object value) {
+    return (Math.abs(Arrays.hashCode(value.toString().getBytes(UTF_8))) & Integer.MAX_VALUE) % _numPartitions;

Review comment:
       Oh nice. Didn't realize these 2 are the same. Applied the change




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[GitHub] [pinot] codecov-commenter edited a comment on pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#issuecomment-1043733376


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   @@             Coverage Diff              @@
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     Lines         85067    83185    -1882     
     Branches      12799    12595     -204     
   ============================================
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   - Misses        20505    25829    +5324     
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   > Powered by [Codecov](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Last update [287f552...3ca6b92](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation).
   


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[GitHub] [pinot] Jackie-Jiang merged pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang merged pull request #8221:
URL: https://github.com/apache/pinot/pull/8221


   


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[GitHub] [pinot] Jackie-Jiang commented on a change in pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on a change in pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#discussion_r809603873



##########
File path: pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/partition/HashCodePartitionFunction.java
##########
@@ -57,4 +56,8 @@ public int getNumPartitions() {
   public String toString() {
     return NAME;
   }
+
+  private int abs(int n) {
+    return (n == Integer.MIN_VALUE) ? 0 : Math.abs(n);

Review comment:
       Sounds good. This is the same as `ByteArrayPartitionFunction`, so I'll also change that




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[GitHub] [pinot] codecov-commenter edited a comment on pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#issuecomment-1043733376


   # [Codecov](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) Report
   > Merging [#8221](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (3ca6b92) into [master](https://codecov.io/gh/apache/pinot/commit/287f55212d012b18803bfb365ba7d4ee501f6acb?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (287f552) will **increase** coverage by `0.02%`.
   > The diff coverage is `87.50%`.
   
   [![Impacted file tree graph](https://codecov.io/gh/apache/pinot/pull/8221/graphs/tree.svg?width=650&height=150&src=pr&token=4ibza2ugkz&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)
   
   ```diff
   @@             Coverage Diff              @@
   ##             master    #8221      +/-   ##
   ============================================
   + Coverage     71.01%   71.04%   +0.02%     
   + Complexity     4320     4319       -1     
   ============================================
     Files          1626     1626              
     Lines         85067    85067              
     Branches      12799    12799              
   ============================================
   + Hits          60408    60433      +25     
   + Misses        20505    20474      -31     
   - Partials       4154     4160       +6     
   ```
   
   | Flag | Coverage Δ | |
   |---|---|---|
   | integration1 | `28.84% <0.00%> (+0.08%)` | :arrow_up: |
   | integration2 | `27.49% <0.00%> (+0.05%)` | :arrow_up: |
   | unittests1 | `67.34% <87.50%> (-0.01%)` | :arrow_down: |
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   |---|---|---|
   | [...gment/spi/partition/HashCodePartitionFunction.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3Qtc2VnbWVudC1zcGkvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL3Bpbm90L3NlZ21lbnQvc3BpL3BhcnRpdGlvbi9IYXNoQ29kZVBhcnRpdGlvbkZ1bmN0aW9uLmphdmE=) | `66.66% <50.00%> (-11.12%)` | :arrow_down: |
   | [...ment/spi/partition/ByteArrayPartitionFunction.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3Qtc2VnbWVudC1zcGkvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL3Bpbm90L3NlZ21lbnQvc3BpL3BhcnRpdGlvbi9CeXRlQXJyYXlQYXJ0aXRpb25GdW5jdGlvbi5qYXZh) | `66.66% <100.00%> (ø)` | |
   | [...segment/spi/partition/ModuloPartitionFunction.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3Qtc2VnbWVudC1zcGkvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL3Bpbm90L3NlZ21lbnQvc3BpL3BhcnRpdGlvbi9Nb2R1bG9QYXJ0aXRpb25GdW5jdGlvbi5qYXZh) | `68.75% <100.00%> (+2.08%)` | :arrow_up: |
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   ------
   
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   > `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
   > Powered by [Codecov](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Last update [287f552...3ca6b92](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation).
   


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[GitHub] [pinot] codecov-commenter edited a comment on pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#issuecomment-1043733376


   # [Codecov](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) Report
   > Merging [#8221](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (3ca6b92) into [master](https://codecov.io/gh/apache/pinot/commit/287f55212d012b18803bfb365ba7d4ee501f6acb?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (287f552) will **decrease** coverage by `1.01%`.
   > The diff coverage is `87.50%`.
   
   [![Impacted file tree graph](https://codecov.io/gh/apache/pinot/pull/8221/graphs/tree.svg?width=650&height=150&src=pr&token=4ibza2ugkz&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)
   
   ```diff
   @@             Coverage Diff              @@
   ##             master    #8221      +/-   ##
   ============================================
   - Coverage     71.01%   70.00%   -1.02%     
   + Complexity     4320     4319       -1     
   ============================================
     Files          1626     1626              
     Lines         85067    85067              
     Branches      12799    12799              
   ============================================
   - Hits          60408    59548     -860     
   - Misses        20505    21391     +886     
   + Partials       4154     4128      -26     
   ```
   
   | Flag | Coverage Δ | |
   |---|---|---|
   | integration1 | `28.84% <0.00%> (+0.08%)` | :arrow_up: |
   | integration2 | `?` | |
   | unittests1 | `67.34% <87.50%> (-0.01%)` | :arrow_down: |
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   Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#carryforward-flags-in-the-pull-request-comment) to find out more.
   
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   |---|---|---|
   | [...gment/spi/partition/HashCodePartitionFunction.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3Qtc2VnbWVudC1zcGkvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL3Bpbm90L3NlZ21lbnQvc3BpL3BhcnRpdGlvbi9IYXNoQ29kZVBhcnRpdGlvbkZ1bmN0aW9uLmphdmE=) | `66.66% <50.00%> (-11.12%)` | :arrow_down: |
   | [...ment/spi/partition/ByteArrayPartitionFunction.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3Qtc2VnbWVudC1zcGkvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL3Bpbm90L3NlZ21lbnQvc3BpL3BhcnRpdGlvbi9CeXRlQXJyYXlQYXJ0aXRpb25GdW5jdGlvbi5qYXZh) | `66.66% <100.00%> (ø)` | |
   | [...segment/spi/partition/ModuloPartitionFunction.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3Qtc2VnbWVudC1zcGkvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL3Bpbm90L3NlZ21lbnQvc3BpL3BhcnRpdGlvbi9Nb2R1bG9QYXJ0aXRpb25GdW5jdGlvbi5qYXZh) | `68.75% <100.00%> (+2.08%)` | :arrow_up: |
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   | [...ager/realtime/PeerSchemeSplitSegmentCommitter.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9kYXRhL21hbmFnZXIvcmVhbHRpbWUvUGVlclNjaGVtZVNwbGl0U2VnbWVudENvbW1pdHRlci5qYXZh) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
   | [...he/pinot/core/plan/StreamingSelectionPlanNode.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9wbGFuL1N0cmVhbWluZ1NlbGVjdGlvblBsYW5Ob2RlLmphdmE=) | `0.00% <0.00%> (-88.89%)` | :arrow_down: |
   | [...ator/streaming/StreamingSelectionOnlyOperator.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9vcGVyYXRvci9zdHJlYW1pbmcvU3RyZWFtaW5nU2VsZWN0aW9uT25seU9wZXJhdG9yLmphdmE=) | `0.00% <0.00%> (-87.81%)` | :arrow_down: |
   | [...re/query/reduce/SelectionOnlyStreamingReducer.java](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9xdWVyeS9yZWR1Y2UvU2VsZWN0aW9uT25seVN0cmVhbWluZ1JlZHVjZXIuamF2YQ==) | `0.00% <0.00%> (-85.72%)` | :arrow_down: |
   | ... and [90 more](https://codecov.io/gh/apache/pinot/pull/8221/diff?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) | |
   
   ------
   
   [Continue to review full report at Codecov](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation).
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   > `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
   > Powered by [Codecov](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Last update [287f552...3ca6b92](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation).
   


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[GitHub] [pinot] Jackie-Jiang commented on pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#issuecomment-1045466593


   @snleee This is not. For modulo, it only fixes the partition if it is negative before, which is not working anyway.


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[GitHub] [pinot] richardstartin commented on a change in pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
richardstartin commented on a change in pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#discussion_r809903284



##########
File path: pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/partition/ByteArrayPartitionFunction.java
##########
@@ -40,8 +42,8 @@ public ByteArrayPartitionFunction(int numPartitions) {
   }
 
   @Override
-  public int getPartition(Object valueIn) {
-    return abs(Arrays.hashCode(valueIn.toString().getBytes())) % _numPartitions;
+  public int getPartition(Object value) {
+    return (Math.abs(Arrays.hashCode(value.toString().getBytes(UTF_8))) & Integer.MAX_VALUE) % _numPartitions;

Review comment:
       Sorry, what I meant was 
   
   ```java
   Math.abs(Arrays.hashCode(value.toString().getBytes(UTF_8)) % _numPartitions);
   ```
   
   produces the right value, because `Arrays.hashCode(value.toString().getBytes(UTF_8)))  % _numPartitions` takes a value in the range `(-_numPartitions, _numPartitions)` which excludes `Integer.MIN_VALUE`, - `Math.abs` is defined everywhere on this domain.




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[GitHub] [pinot] richardstartin commented on a change in pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
richardstartin commented on a change in pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#discussion_r810336904



##########
File path: pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/partition/ByteArrayPartitionFunction.java
##########
@@ -40,8 +42,8 @@ public ByteArrayPartitionFunction(int numPartitions) {
   }
 
   @Override
-  public int getPartition(Object valueIn) {
-    return abs(Arrays.hashCode(valueIn.toString().getBytes())) % _numPartitions;
+  public int getPartition(Object value) {
+    return (Math.abs(Arrays.hashCode(value.toString().getBytes(UTF_8))) & Integer.MAX_VALUE) % _numPartitions;

Review comment:
       Ok I didn’t realise there was a predefined output requirement, just that min value needed to end up non negative somehow. Makes sense.




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[GitHub] [pinot] richardstartin commented on a change in pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
richardstartin commented on a change in pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#discussion_r809575579



##########
File path: pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/partition/HashCodePartitionFunction.java
##########
@@ -57,4 +56,8 @@ public int getNumPartitions() {
   public String toString() {
     return NAME;
   }
+
+  private int abs(int n) {
+    return (n == Integer.MIN_VALUE) ? 0 : Math.abs(n);

Review comment:
       this is equivalent to `Math.abs(n) & Integer.MAX_VALUE` but the callers could just move the modulo inside the `Math.abs` to avoid dealing with `Integer.MIN_VALUE`




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[GitHub] [pinot] codecov-commenter edited a comment on pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#issuecomment-1043733376


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   @@              Coverage Diff              @@
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     Branches      12799    12595      -204     
   =============================================
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   ------
   
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[GitHub] [pinot] codecov-commenter edited a comment on pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#issuecomment-1043733376


   # [Codecov](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) Report
   > Merging [#8221](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (b316b73) into [master](https://codecov.io/gh/apache/pinot/commit/582d621e2a07f605ecd1edac7f97c65ade3a2d41?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (582d621) will **increase** coverage by `0.04%`.
   > The diff coverage is `100.00%`.
   
   [![Impacted file tree graph](https://codecov.io/gh/apache/pinot/pull/8221/graphs/tree.svg?width=650&height=150&src=pr&token=4ibza2ugkz&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)](https://codecov.io/gh/apache/pinot/pull/8221?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)
   
   ```diff
   @@             Coverage Diff              @@
   ##             master    #8221      +/-   ##
   ============================================
   + Coverage     64.28%   64.32%   +0.04%     
   - Complexity     4312     4317       +5     
   ============================================
     Files          1581     1581              
     Lines         83122    83120       -2     
     Branches      12587    12587              
   ============================================
   + Hits          53436    53469      +33     
   + Misses        25852    25821      -31     
   + Partials       3834     3830       -4     
   ```
   
   | Flag | Coverage Δ | |
   |---|---|---|
   | unittests1 | `67.39% <100.00%> (+0.05%)` | :arrow_up: |
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   |---|---|---|
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[GitHub] [pinot] Jackie-Jiang commented on a change in pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on a change in pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#discussion_r810313565



##########
File path: pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/partition/ByteArrayPartitionFunction.java
##########
@@ -40,8 +42,8 @@ public ByteArrayPartitionFunction(int numPartitions) {
   }
 
   @Override
-  public int getPartition(Object valueIn) {
-    return abs(Arrays.hashCode(valueIn.toString().getBytes())) % _numPartitions;
+  public int getPartition(Object value) {
+    return (Math.abs(Arrays.hashCode(value.toString().getBytes(UTF_8))) & Integer.MAX_VALUE) % _numPartitions;

Review comment:
       Actually they are not the same if the hash code is `Integer.MIN_VALUE`, where the current one will always result in `0`. We are trying to match the Kafka [ByteArrayPartitioner](https://github.com/a0x8o/kafka/blob/master/core/src/main/scala/kafka/producer/ByteArrayPartitioner.scala) which uses this [abs()](https://github.com/a0x8o/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/utils/Utils.java#L179).
   
   Let me add some comments on this




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[GitHub] [pinot] Jackie-Jiang commented on a change in pull request #8221: Ensure partition function never return negative partition

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on a change in pull request #8221:
URL: https://github.com/apache/pinot/pull/8221#discussion_r810305567



##########
File path: pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/partition/ByteArrayPartitionFunction.java
##########
@@ -40,8 +42,8 @@ public ByteArrayPartitionFunction(int numPartitions) {
   }
 
   @Override
-  public int getPartition(Object valueIn) {
-    return abs(Arrays.hashCode(valueIn.toString().getBytes())) % _numPartitions;
+  public int getPartition(Object value) {
+    return (Math.abs(Arrays.hashCode(value.toString().getBytes(UTF_8))) & Integer.MAX_VALUE) % _numPartitions;

Review comment:
       Oh nice. Didn't realize these 2 are the same. Applied the change




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