# Alternatives, Inspiration and Comparisons { #alternatives-inspiration-and-comparisons }

What inspired **FastAPI**, how it compares to alternatives and what it learned from them.

## Intro { #intro }

**FastAPI** wouldn't exist if not for the previous work of others.

There have been many tools created before that have helped inspire its creation.

  - Certificates created with kubeadm now have improved uniqueness of Distinguished Name fields.
- HA improvements:
  - `kubeadm join --experimental-control-plane` can now be used to join control plane instances to an existing cluster.
  - `kubeadm upgrade node experimental-control-plane` can now be used for upgrading secondary control plane instances created with `kubeadm join --experimental-control-plane`.

                log.warn("Tree was not properly released, performing emergency cleanup: " + this);
                emergencyCleanup();
            }
        } catch (Exception e) {
            log.error("Error during tree finalization", e);
        } finally {
            super.finalize();
        }
    }

    /**
     * Emergency cleanup method to prevent memory leaks during finalization
     */

            log.error("Failed to create handle state directory: " + stateDirectory, e);
        }

        // Load persisted handles on startup
        loadPersistedHandles();

        // Schedule periodic persistence and cleanup
        scheduler.scheduleAtFixedRate(this::periodicMaintenance, 30, 30, TimeUnit.SECONDS);
    }

    /**
     * Request a new durable handle
     * @param path the file path
     * @param type the handle type

- Removed `BlockOwnerDeletion` from `ResourceClaim` created from `ResourceClaimTemplate` and from `extendedResourceClaim` created by the `scheduler`. ([#134956](https://github.com/kubernetes/kubernetes/pull/134956), [@yliaog](https://github.com/yliaog)) [SIG Apps, Node and Scheduling]

   * lifetime of the cache.
   *
   * <p><b>Warning:</b> this cache may not be recording statistical data. For example, a cache
   * created using {@link CacheBuilder} only does so if the {@link CacheBuilder#recordStats} method
   * was called. If statistics are not being recorded, a {@code CacheStats} instance with zero for
   * all values is returned.
   *
   */

        assertEquals(expectedKey, result);
        verify(baseLeaseManager).requestLease(directoryPath, requestedState);

        // Verify cache entry was created
        DirectoryCacheEntry cacheEntry = directoryLeaseManager.getCacheEntry(directoryPath);
        assertNotNull(cacheEntry);
        assertEquals(directoryPath, cacheEntry.getDirectoryPath());

    // can't compare map contents until cleanup occurs

    for (int i = 1; i <= originalCount * 2; i *= 2) {
      if (i > 1) {
        segment.expand();
      }
      assertThat(segment.table.length()).isEqualTo(i);
      assertThat(countLiveEntries(map, 0)).isEqualTo(liveCount);
      // expansion cleanup is sloppy, with a goal of avoiding unnecessary copies

    // can't compare map contents until cleanup occurs

    for (int i = 1; i <= originalCount * 2; i *= 2) {
      if (i > 1) {
        segment.expand();
      }
      assertThat(segment.table.length()).isEqualTo(i);
      assertThat(countLiveEntries(map, 0)).isEqualTo(liveCount);
      // expansion cleanup is sloppy, with a goal of avoiding unnecessary copies

        add(property, new UserMessage(SUCCESS_update_design_jsp_file, arg0));
        return this;
    }

    /**
     * Add the created action message for the key 'success.create_crawling_config_at_wizard' with parameters.
     * <pre>
     * message: Created a crawling config {0}.
     * </pre>
     * @param property The property name for the message. (NotNull)