Hadoop Distributed File System (HDFS) is a distributed file system designed to run on commodity hardware. It is highly fault-tolerant and designed to be deployed on low-cost hardware. HDFS is the primary storage system used by Hadoop applications and provides high throughput access to application data.
One common issue that can occur in HDFS is when the Namenode becomes unresponsive or fails to start. This is a critical problem as the Namenode is responsible for managing the metadata and directory structure of all files and directories in the HDFS.
When attempting to start or interact with the Namenode, you may encounter errors indicating that the Namenode cannot be reached or is not functioning properly. This can manifest as an inability to access HDFS data or perform file operations.
The error code HDFS-011: Namenode Disk Failure indicates a failure in the disk where the Namenode's metadata is stored. This disk failure can lead to the Namenode being unable to read or write the necessary metadata, resulting in the observed symptoms.
The root cause of this issue is typically a hardware failure in the disk used by the Namenode. This can be due to physical damage, wear and tear, or other hardware-related issues that prevent the disk from functioning correctly.
To resolve the HDFS-011: Namenode Disk Failure issue, follow these steps:
/var/log/hadoop-hdfs/ directory.smartctl to check the health of the disks. For example, run smartctl -a /dev/sdX where /dev/sdX is the disk identifier.hdfs namenode -restore command.hadoop-daemon.sh start namenode command.For more information on managing HDFS and troubleshooting common issues, refer to the following resources:
Let Dr. Droid create custom investigation plans for your infrastructure.
Book Demo
