本文整理汇总了Java中org.apache.hadoop.hdfs.server.namenode.NameNode.format方法的典型用法代码示例。如果您正苦于以下问题：Java NameNode.format方法的具体用法？Java NameNode.format怎么用？Java NameNode.format使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类org.apache.hadoop.hdfs.server.namenode.NameNode的用法示例。
在下文中一共展示了NameNode.format方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: formatNameNode
import org.apache.hadoop.hdfs.server.namenode.NameNode; //导入方法依赖的package包/类
/**
* when formatting a namenode - we must provide clusterid.
* @param conf
* @throws IOException
*/
public static void formatNameNode(Configuration conf) throws IOException {
String clusterId = StartupOption.FORMAT.getClusterId();
if(clusterId == null || clusterId.isEmpty())
StartupOption.FORMAT.setClusterId("testClusterID");
// Use a copy of conf as it can be altered by namenode during format.
NameNode.format(new Configuration(conf));
}
示例2: testMismatchedNNIsRejected
import org.apache.hadoop.hdfs.server.namenode.NameNode; //导入方法依赖的package包/类
@Test (timeout = 30000)
public void testMismatchedNNIsRejected() throws Exception {
conf.set(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY,
MiniDFSCluster.getBaseDirectory() + "/TestNNWithQJM/image");
String defaultEditsDir = conf.get(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY);
conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
mjc.getQuorumJournalURI("myjournal").toString());
// Start a NN, so the storage is formatted -- both on-disk
// and QJM.
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
.numDataNodes(0)
.manageNameDfsDirs(false)
.build();
cluster.shutdown();
// Reformat just the on-disk portion
Configuration onDiskOnly = new Configuration(conf);
onDiskOnly.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY, defaultEditsDir);
NameNode.format(onDiskOnly);
// Start the NN - should fail because the JNs are still formatted
// with the old namespace ID.
try {
cluster = new MiniDFSCluster.Builder(conf)
.numDataNodes(0)
.manageNameDfsDirs(false)
.format(false)
.build();
fail("New NN with different namespace should have been rejected");
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains(
"Unable to start log segment 1: too few journals", ioe);
}
}