Hadoop datanode无法开始抛出org.apache.hadoop.hdfs.server.common.Storage：无法锁定存储

Question

我在尝试在Hadoop中启动datanode时遇到一些问题，从日志中我可以看到datanode启动了两次（部分日志跟随）：

2012-05-22 16:25:00,369 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = master/192.168.0.1
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 1.0.1
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1243785; compiled by 'hortonfo' on Tue Feb 14 08:15:38 UTC 2012
************************************************************/
2012-05-22 16:25:00,375 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = master/192.168.0.1
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 1.0.1
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1243785; compiled by 'hortonfo' on Tue Feb 14 08:15:38 UTC 2012
************************************************************/
2012-05-22 16:25:00,490 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2012-05-22 16:25:00,500 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
2012-05-22 16:25:00,500 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2012-05-22 16:25:00,500 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
2012-05-22 16:25:00,512 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2012-05-22 16:25:00,523 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
2012-05-22 16:25:00,523 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2012-05-22 16:25:00,524 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
2012-05-22 16:25:00,722 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.
2012-05-22 16:25:00,724 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.
2012-05-22 16:25:00,727 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists!
2012-05-22 16:25:00,729 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists!
2012-05-22 16:20:15,894 INFO org.apache.hadoop.hdfs.server.common.Storage: Cannot lock storage /app/hadoop/tmp/dfs/data. The directory is already locked.
2012-05-22 16:20:16,008 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Cannot lock storage /app/hadoop/tmp/dfs/data. The directory is already locked.
        at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.lock(Storage.java:602)
        at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.analyzeStorage(Storage.java:455)
        at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:111)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:385)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:299)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1582)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1521)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1539)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1665)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1682)

我在网上搜索，我发现这个问题 ，但使用的conf / HDFS-site.xml中我没有覆盖任何东西，也就是如下图所示，这样的Hadoop应该使用（如描述默认值这里 ）不能引起任何故障的锁。 这是我的conf / hdfs-site.xml：

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>
  <property>
    <name>dfs.replication</name>
    <value>2</value>
    <description>Default block replication.
    The actual number of replications can be specified when the file is created.
    The default is used if replication is not specified in create time.
    </description>
  </property>
</configuration>

这是我的conf / core-site.xml：

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>
  <property>
    <name>hadoop.tmp.dir</name>
    <value>/app/hadoop/tmp</value>
    <description>A base for other temporary directories.</description>
  </property>

  <property>
    <name>fs.default.name</name>
    <value>hdfs://master:54310</value>
    <description>The name of the default file system.  A URI whose
    scheme and authority determine the FileSystem implementation.  The
    uri's scheme determines the config property (fs.SCHEME.impl) naming
    the FileSystem implementation class.  The uri's authority is used to
    determine the host, port, etc. for a filesystem.</description>
  </property>
</configuration>

这是hadoop / conf / slaves的内容：

master
slave

Answer 1

• 停止datanode
• 从dfs数据目录中删除in_use.lock文件
• 位置和启动datanode

它应该工作得很好

Answer 2

还要在hdfs-site.xml文件中添加以下2个属性。

<property>
        <name>dfs.name.dir</name>
        <value>/some_path</value>
    </property>

    <property>
        <name>dfs.data.dir</name>
        <value>/some_path</value>
    </property>

它们的默认位置是/tmp ..因此，每次重启都会丢失数据。

Answer 3

我遇到了类似的问题，但我读了一篇文章说dfs.name.dir和dfs.data.dir应该彼此不同。 我让这两个是相同的，并将这些值更改为彼此不同修复了我的问题。

Answer 4

我有同样的问题，并在shell中将umask设置为0022，我在运行测试时为我解决了问题。

Answer 5

sudo rm -r /tmp/hadoop-[YourNameHere]/dfs/data/

并重新启动dfs。