[jvm-packages] do not use multiple jobs to make checkpoints (#5082)

* temp * temp * tep * address the comments * fix stylistic issues * fix * external checkpoint
dmlc · Feb 3, 2020 · 8e39a67 · 8e39a67
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commit 8e39a67
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diff --git a/jvm-packages/pom.xml b/jvm-packages/pom.xml
@@ -37,6 +37,7 @@
         <spark.version>2.4.3</spark.version>
         <scala.version>2.12.8</scala.version>
         <scala.binary.version>2.12</scala.binary.version>
+        <hadoop.version>2.7.3</hadoop.version>
     </properties>
     <repositories>
         <repository>

diff --git a/...ages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/CheckpointManager.scala b/...ages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/CheckpointManager.scala