apache/hadoop · error · IOException

Could not start Curator tokenCacheListener for tokens

Error message

Could not start Curator tokenCacheListener for tokens

What it means

Error "Could not start Curator tokenCacheListener for tokens" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/ZKDelegationTokenSecretManager.java:341

                    + "NODE_CREATED / NODE_CHANGED event");
                throw new UncheckedIOException(e);
              }
            })
            .forDeletes(childData -> {
              try {
                processTokenRemoved(childData);
              } catch (IOException e) {
                LOG.error("Error while processing Curator tokenCacheListener "
                    + "NODE_DELETED event");
                throw new UncheckedIOException(e);
              }
            })
            .build();
        tokenCache.listenable().addListener(tokenCacheListener);
        tokenCache.start();
        loadFromZKCache(true);
      } catch (Exception e) {
        throw new IOException(
            "Could not start Curator tokenCacheListener for tokens", e);
      }
    }
    super.startThreads();
  }

  /**
   * Load the CuratorCache into the in-memory map. Possible caches to be
   * loaded are keyCache and tokenCache.
   *
   * @param isTokenCache true if loading tokenCache, false if loading keyCache.
   */
  private void loadFromZKCache(final boolean isTokenCache) {
    final String cacheName = isTokenCache ? "token" : "key";
    LOG.info("Starting to load {} cache.", cacheName);
    final Stream<ChildData> children;
    if (isTokenCache) {
      children = tokenCache.stream();

View on GitHub (pinned to 2add963021)

Solutions

1. The Curator cache listener for delegation tokens failed to start. Check ZK connectivity and that the tokens znode path exists; restart the service.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/ZKDelegationTokenSecretManager.java:341 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/75e837a20dbbcd59. Report an issue: GitHub.