apache/hadoop · error · InvalidRequestException

Cannot remove non-existent cache pool poolName

Error message

Cannot remove non-existent cache pool poolName

What it means

Error "Cannot remove non-existent cache pool poolName" thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/CacheManager.java:924

        bld.toString());
  }

  /**
   * Remove a cache pool.
   * 
   * Only the superuser should be able to call this function.
   *
   * @param poolName
   *          The name for the cache pool to remove.
   */
  public void removeCachePool(String poolName)
      throws IOException {
    assert namesystem.hasWriteLock(RwLockMode.FS);
    try {
      CachePoolInfo.validateName(poolName);
      CachePool pool = cachePools.remove(poolName);
      if (pool == null) {
        throw new InvalidRequestException(
            "Cannot remove non-existent cache pool " + poolName);
      }
      // Remove all directives in this pool.
      Iterator<CacheDirective> iter = pool.getDirectiveList().iterator();
      while (iter.hasNext()) {
        CacheDirective directive = iter.next();
        directivesByPath.removeAll(directive.getPath());
        directivesById.remove(directive.getId());
        iter.remove();
      }
      setNeedsRescan();
    } catch (IOException e) {
      LOG.info("removeCachePool of " + poolName + " failed: ", e);
      throw e;
    }
    LOG.info("removeCachePool of " + poolName + " successful.");
  }

View on GitHub (pinned to 2add963021)

Solutions

1. Verify the pool name with hdfs cacheadmin -listPools before removing; the pool may already be deleted.

When it happens

Trigger: removeCachePool naming a pool that does not exist.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/e3ac8d906325a3c0. Report an issue: GitHub.