zhengruifeng commented on pull request #31163:
URL: https://github.com/apache/spark/pull/31163#issuecomment-759185176
```
scala> import org.apache.spark.ml.classification._
import org.apache.spark.ml.classification._
scala>
scala> val df =
spark.read.format("libsvm").load("/d0/Dev/Opensource/spark/data/mllib/sample_multiclass_classification_data.txt")
21/01/13 11:40:35 WARN LibSVMFileFormat: 'numFeatures' option not specified,
determining the number of features by going though the input. If you know the
number in advance, please specify it via 'numFeatures' option to avoid the
extra scan.
df: org.apache.spark.sql.DataFrame = [label: double, features: vector]
scala> val dt = new DecisionTreeClassifi
DecisionTreeClassificationModel DecisionTreeClassifier
scala> val dt = new DecisionTreeClassifier().setMax
setMaxBins setMaxDepth setMaxMemoryInMB
scala> val dt = new DecisionTreeClassifier().setMaxDepth(32)
dt: org.apache.spark.ml.classification.DecisionTreeClassifier =
dtc_9ad3d8b78d64
scala> dt.fit(df)
21/01/13 11:41:01 ERROR Instrumentation: java.lang.IllegalArgumentException:
requirement failed: DecisionTree currently only supports maxDepth <= 30, but
was given maxDepth = 32.
at scala.Predef$.require(Predef.scala:281)
at
org.apache.spark.ml.tree.impl.RandomForest$.runBagged(RandomForest.scala:145)
at
org.apache.spark.ml.tree.impl.RandomForest$.run(RandomForest.scala:302)
at
org.apache.spark.ml.classification.DecisionTreeClassifier.$anonfun$train$1(DecisionTreeClassifier.scala:135)
at
org.apache.spark.ml.util.Instrumentation$.$anonfun$instrumented$1(Instrumentation.scala:191)
at scala.util.Try$.apply(Try.scala:213)
at
org.apache.spark.ml.util.Instrumentation$.instrumented(Instrumentation.scala:191)
at
org.apache.spark.ml.classification.DecisionTreeClassifier.train(DecisionTreeClassifier.scala:114)
at
org.apache.spark.ml.classification.DecisionTreeClassifier.train(DecisionTreeClassifier.scala:46)
at org.apache.spark.ml.Predictor.fit(Predictor.scala:150)
at
$line21.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw.<init>(<console>:31)
at
$line21.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw.<init>(<console>:35)
```
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