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Posted to issues@flink.apache.org by "JieFang.He (Jira)" <ji...@apache.org> on 2021/01/06 01:29:00 UTC
[jira] [Created] (FLINK-20855) Calculating numBuckets exceeds the
maximum value of int and got a negative number
JieFang.He created FLINK-20855:
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Summary: Calculating numBuckets exceeds the maximum value of int and got a negative number
Key: FLINK-20855
URL: https://issues.apache.org/jira/browse/FLINK-20855
Project: Flink
Issue Type: Bug
Components: Table SQL / Runtime
Affects Versions: 1.11.1, 1.12.0
Reporter: JieFang.He
When i run the TPCDS of 500G,i get a exception
{code:java}
Caused by: java.lang.IllegalArgumentException
at org.apache.flink.util.Preconditions.checkArgument(Preconditions.java:123)
at org.apache.flink.table.runtime.hashtable.LongHashPartition.setNewBuckets(LongHashPartition.java:223)
at org.apache.flink.table.runtime.hashtable.LongHashPartition.<init>(LongHashPartition.java:176)
at org.apache.flink.table.runtime.hashtable.LongHybridHashTable.buildTableFromSpilledPartition(LongHybridHashTable.java:432)
at org.apache.flink.table.runtime.hashtable.LongHybridHashTable.prepareNextPartition(LongHybridHashTable.java:354)
at org.apache.flink.table.runtime.hashtable.LongHybridHashTable.nextMatching(LongHybridHashTable.java:145)
at LongHashJoinOperator$40166.endInput2$(Unknown Source)
at LongHashJoinOperator$40166.endInput(Unknown Source)
at org.apache.flink.streaming.runtime.tasks.StreamOperatorWrapper.endOperatorInput(StreamOperatorWrapper.java:101)
at org.apache.flink.streaming.runtime.tasks.OperatorChain.endHeadOperatorInput(OperatorChain.java:278)
at org.apache.flink.streaming.runtime.io.StreamTwoInputProcessor.checkFinished(StreamTwoInputProcessor.java:211)
at org.apache.flink.streaming.runtime.io.StreamTwoInputProcessor.processInput(StreamTwoInputProcessor.java:183)
at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:349)
at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxStep(MailboxProcessor.java:191)
at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:181)
at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:564)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:534)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546)
at java.lang.Thread.run(Thread.java:748)
{code}
The reason is: when calculate the numBuckets in LongHashPartition,the result exceeds the maximum value of int and got a negative number
{code:java}
LongHashPartition(
LongHybridHashTable longTable,
int partitionNum,
BinaryRowDataSerializer buildSideSerializer,
int bucketNumSegs,
int recursionLevel,
List<MemorySegment> buffers,
int lastSegmentLimit) {
this(longTable, buildSideSerializer, listToArray(buffers));
this.partitionNum = partitionNum;
this.recursionLevel = recursionLevel;
int numBuckets = MathUtils.roundDownToPowerOf2(bucketNumSegs * segmentSize / 16);
MemorySegment[] buckets = new MemorySegment[bucketNumSegs];
for (int i = 0; i < bucketNumSegs; i++) {
buckets[i] = longTable.nextSegment();
}
setNewBuckets(buckets, numBuckets);
this.finalBufferLimit = lastSegmentLimit;
}
{code}
A way to avoid the exception is to adjust the calculation order
change
{code:java}
int numBuckets = MathUtils.roundDownToPowerOf2(bucketNumSegs * segmentSize / 16);
{code}
to
{code:java}
int numBuckets = MathUtils.roundDownToPowerOf2(bucketNumSegs / 16 * segmentSize);
{code}
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