FAQ

• NameNode Startup Is Slow

• DataNode Is Normal but Cannot Report Data Blocks

• HDFS WebUI Cannot Properly Update Information About Damaged Data

• Why Does the Distcp Command Fail in the Secure Cluster, Causing an Exception?

• Why Does DataNode Fail to Start When the Number of Disks Specified by dfs.datanode.data.dir Equals dfs.datanode.failed.volumes.tolerated?

• Failed to Calculate the Capacity of a DataNode when Multiple data.dir Directories Are Configured in a Disk Partition

• Standby NameNode Fails to Be Restarted When the System Is Powered off During Metadata (Namespace) Storage

• Why Data in the Buffer Is Lost If a Power Outage Occurs During Storage of Small Files

• Why Does Array Border-crossing Occur During FileInputFormat Split?

• Why Is the Storage Type of File Copies DISK When the Tiered Storage Policy Is LAZY_PERSIST?

• The HDFS Client Is Unresponsive When the NameNode Is Overloaded for a Long Time

• Can I Delete or Modify the Data Storage Directory in DataNode?

• Blocks Miss on the NameNode UI After the Successful Rollback

• Why Is "java.net.SocketException: No buffer space available" Reported When Data Is Written to HDFS

• Why are There Two Standby NameNodes After the active NameNode Is Restarted?

• When Does a Balance Process in HDFS, Shut Down and Fail to be Executed Again?

• "This page can't be displayed" Is Displayed When Internet Explorer Fails to Access the Native HDFS UI

• NameNode Fails to Be Restarted Due to EditLog Discontinuity

last updated: 2025-07-09 15:07 UTC - commit: cb943fa3145d5c3e150bb4fa1a987d24c3077fe9