public void setPartitionCount(int partitionCount) {
    this.partitionCount = partitionCount;
  }
Setter for the number of partitions to create on a new StreamAppender stream. See also {@link #activateOptions()} for when this is called.
Example: {@literal <param name="PartitionCount" value="4"/>}
@param partitionCount Configurable partition count.
samza-log4j/src/main/java/org/apache/samza/logging/log4j/StreamAppender.java