apache/hadoop · error · IOException

Can't renew or get new delegation token

Error message

Can't renew or get new delegation token 

What it means

Error "Can't renew or get new delegation token " thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/DelegationTokenRenewer.java:145

      final T fs = weakFs.get();
      final boolean b = fs != null;
      if (b) {
        synchronized(fs) {
          try {
            long expires = token.renew(fs.getConf());
            updateRenewalTime(expires - Time.now());
          } catch (IOException ie) {
            try {
              Token<?>[] tokens = fs.addDelegationTokens(null, null);
              if (tokens.length == 0) {
                throw new IOException("addDelegationTokens returned no tokens");
              }
              token = tokens[0];
              updateRenewalTime(renewCycle);
              fs.setDelegationToken(token);
            } catch (IOException ie2) {
              isValid = false;
              throw new IOException("Can't renew or get new delegation token ", ie);
            }
          }
        }
      }
      return b;
    }

    private void cancel() throws IOException, InterruptedException {
      final T fs = weakFs.get();
      if (fs != null) {
        token.cancel(fs.getConf());
      }
    }

    @Override
    public String toString() {
      Renewable fs = weakFs.get();
      return fs == null? "evaporated token renew"

View on GitHub (pinned to 2add963021)

Solutions

1. Verify Kerberos credentials are valid (kinit / keytab) and not expired.
2. Check network connectivity to the token-issuing service (NameNode/RM).
3. Inspect the wrapped exception for the underlying renewal failure cause.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/DelegationTokenRenewer.java:145 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/a4de021d76b4b4ad. Report an issue: GitHub.