apache/hadoop · error · DiskOutOfSpaceException

No more available volumes

Error message

No more available volumes

What it means

Error "No more available volumes" thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/RoundRobinVolumeChoosingPolicy.java:83

        DFS_DATANODE_ROUND_ROBIN_VOLUME_CHOOSING_POLICY_ADDITIONAL_AVAILABLE_SPACE_DEFAULT);

    LOG.info("Round robin volume choosing policy initialized: " +
        DFS_DATANODE_ROUND_ROBIN_VOLUME_CHOOSING_POLICY_ADDITIONAL_AVAILABLE_SPACE_KEY +
        " = " + additionalAvailableSpace);
  }

  @Override
  public Configuration getConf() {
    // Nothing to do. Only added to fulfill the Configurable contract.
    return null;
  }

  @Override
  public V chooseVolume(final List<V> volumes, long blockSize, String storageId)
      throws IOException {

    if (volumes.size() < 1) {
      throw new DiskOutOfSpaceException("No more available volumes");
    }

    // As all the items in volumes are with the same storage type,
    // so only need to get the storage type index of the first item in volumes
    StorageType storageType = volumes.get(0).getStorageType();
    int index = storageType != null ?
            storageType.ordinal() : StorageType.DEFAULT.ordinal();

    synchronized (syncLocks[index]) {
      return chooseVolume(index, volumes, blockSize);
    }
  }

  private V chooseVolume(final int curVolumeIndex, final List<V> volumes,
                         long blockSize) throws IOException {
    // since volumes could've been removed because of the failure
    // make sure we are not out of bounds
    int curVolume = curVolumes[curVolumeIndex] < volumes.size()

View on GitHub (pinned to 2add963021)

Solutions

1. Free disk space on the DataNode volumes or add more volumes to dfs.datanode.data.dir.
2. Check the DataNode log for failed volumes and repair or replace the underlying disks.
3. Verify dfs.datanode.data.dir paths are mounted and writable, then restart the DataNode.

When it happens

Trigger: Block allocation when the round-robin volume choosing policy finds no volume with free space, i.e. all DataNode volumes are full or failed.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/3978b65147734e89. Report an issue: GitHub.