liuxian created SPARK-25776:
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Summary: The disk write buffer size must be greater than 12.
Key: SPARK-25776
URL: https://issues.apache.org/jira/browse/SPARK-25776
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 3.0.0
Reporter: liuxian
In {{UnsafeSorterSpillWriter.java}}, when we write a record to a spill file
wtih {{ void write(Object baseObject, long baseOffset, int recordLength, long
keyPrefix)}}, {{recordLength}} and {{keyPrefix}} will be written the disk write
buffer first, and these will take 12 bytes, so the disk write buffer size must
be greater than 12.
If {{diskWriteBufferSize}} is 10, it will print this exception info:
_java.lang.ArrayIndexOutOfBoundsException: 10_
_at
org.apache.spark.util.collection.unsafe.sort.UnsafeSorterSpillWriter.writeLongToBuffer
(UnsafeSorterSpillWriter.java:91)_
_at
org.apache.spark.util.collection.unsafe.sort.UnsafeSorterSpillWriter.write(UnsafeSorterSpillWriter.java:123)_
_at
org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.spillIterator(UnsafeExternalSorter.java:498)_
_at
org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.spill(UnsafeExternalSorter.java:222)_
_at org.apache.spark.memory.MemoryConsumer.spill(MemoryConsumer.java:65)_
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