我有一个运行Hadoop 1.2.1的群集，顶部是giraph。服务器运行正常，但是当我停止它时，我无法使其再次运行。在datanode日志中，出现以下错误：错误org.apache.hadoop.hdfs.server.datanode.DataNode：java.io.IOException：无法锁定存储/ pathToFolder / data / datanode。目录已被锁定。
我尝试了很多在网上找到的解决方案：
- 检查文件夹的权限。
- 检查相同版本的VERSION文件中的namenode和datanode。
- 检查配置文件（核心站点，hdfs站点，mapred站点，主站点，从属站点...）
- 删除/更改namenode和datanode数据文件夹
- 删除hadoop临时文件
最重要的是，一切似乎都很好，但是仍然无法启动datanode。数据节点的完整日志文件如下：
2020-06-24 11:23:46,624 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
/********************
STARTUP_MSG: Starting DataNode
STARTUP_MSG: host = XXXX
STARTUP_MSG: args = []
STARTUP_MSG: version = 1.2.1
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG: java = 1.8.0_212
********************/
2020-06-24 11:23:46,719 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2020-06-24 11:23:46,725 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
2020-06-24 11:23:46,726 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2020-06-24 11:23:46,726 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
2020-06-24 11:23:46,791 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.
2020-06-24 11:23:46,794 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists!
2020-06-24 11:23:46,903 INFO org.apache.hadoop.hdfs.server.common.Storage: Cannot lock storage /users/lahdak/rojas/AppHadoop/data/datanode. The directory is already locked.
2020-06-24 11:23:47,004 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Cannot lock storage /users/lahdak/rojas/AppHadoop/data/datanode. The directory is already locked.
at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.lock(Storage.java:599)
at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.analyzestorage(Storage.java:452)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:111)
at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:414)
at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:321)
at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1712)
at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1651)
at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1669)
at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1795)
at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1812)
2020-06-24 11:23:47,004 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
/********************
SHUTDOWN_MSG: Shutting down DataNode at XXXX
********************/