我运行了一个spark本地单元测试应用程序，但它抛出了内存不足异常。scala测试首先初始化hbase minicluster，然后初始化spark会话。
spark的版本是2.1.0，下面是异常日志的一部分

2018-03-18 16:01:34 INFO  BlockManager:54 - Using org.apache.spark.storage.RandomBlockReplicationPolicy for block replication policy
2018-03-18 16:01:34 INFO  BlockManagerMaster:54 - Registering BlockManager BlockManagerId(driver, 192.168.10.208, 57931, None)
2018-03-18 16:01:34 INFO  BlockManagerMasterEndpoint:54 - Registering block manager 192.168.10.208:57931 with 2.2 GB RAM, BlockManagerId(driver, 192.168.10.208, 57931, None)
2018-03-18 16:01:34 INFO  BlockManagerMaster:54 - Registered BlockManager BlockManagerId(driver, 192.168.10.208, 57931, None)
2018-03-18 16:01:34 INFO  BlockManager:54 - Initialized BlockManager: BlockManagerId(driver, 192.168.10.208, 57931, None)
2018-03-18 16:01:36 INFO  ScheduledChore:175 - Chore: SplitLogManager Timeout Monitor missed its start time
2018-03-18 16:01:36 ERROR MetricsSystem:70 - Sink class org.apache.spark.metrics.sink.MetricsServlet cannot be instantiated
2018-03-18 16:01:38 INFO  MDMHbaseToTidbTaskTest:64 - close MDMHbaseToTidbTaskTest
2018-03-18 16:01:39 INFO  ScheduledChore:175 - Chore: SplitLogManager Timeout Monitor missed its start time
2018-03-18 16:01:39 INFO  HBaseCommonTestingUtility:1095 - Shutting down minicluster
2018-03-18 16:01:39 INFO  ConnectionManager$HConnectionImplementation:2259 - Closing master protocol: MasterService
2018-03-18 16:01:40 INFO  ConnectionManager$HConnectionImplementation:1830 - Closing zookeeper sessionid=0x1623820ab0a0007

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "org.apache.hadoop.util.JvmPauseMonitor$Monitor@54b483bf"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "JvmPauseMonitor"
2018-03-18 16:01:51 INFO  ScheduledChore:175 - Chore: 192.168.10.208,57898,1521360088886-DoMetricsChore missed its start time
2018-03-18 16:01:52 INFO  ScheduledChore:175 - Chore: SplitLogManager Timeout Monitor missed its start time
2018-03-18 16:01:52 INFO  ScheduledChore:175 - Chore: CompactionChecker missed its start time

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "DataXceiver for client DFSClient_NONMAPREDUCE_-869429954_1 at /127.0.0.1:57900 [Cleaning up]"
2018-03-18 16:02:02 INFO  ScheduledChore:175 - Chore: SplitLogManager Timeout Monitor missed its start time
2018-03-18 16:02:02 INFO  ScheduledChore:175 - Chore: 192.168.10.208,57898,1521360088886-DoMetricsChore missed its start time
2018-03-18 16:02:03 INFO  CacheReplicationMonitor:179 - Rescanning after 37285 milliseconds
2018-03-18 16:02:02 INFO  ScheduledChore:175 - Chore: 192.168.10.208,57901,1521360089611-MemstoreFlusherChore missed its start time

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "org.apache.hadoop.util.JvmPauseMonitor$Monitor@6e692fe"
2018-03-18 16:02:07 INFO  ScheduledChore:175 - Chore: SplitLogManager Timeout Monitor missed its start time

Process finished with exit code 137 (interrupted by signal 9: SIGKILL)

如何解决这个问题。我错过了什么？