我有一个运行hadoop1.2.1的集群，上面有giraph。服务器运行正常，但当我停止它，我无法使它再次运行。在datanode日志中，我得到以下错误：error org.apache.hadoop.hdfs.server.datanode.datanode:java.io.ioexception:cannot lock storage/pathtofolder/data/datanode。目录已锁定。
我在网上找到了很多解决方案：
正在检查文件夹的权限。
正在检查namenode和datanode的版本文件的相同版本。
检查配置文件（核心站点、hdfs站点、Map站点、主站点、从站点…）
删除/更改namenode和datanode数据文件夹
删除hadoop临时文件
底线是，一切看起来都很好，但它仍然无法启动datanode。datanode的完整日志文件如下所示：

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

********************/