apache/hadoop · error · IllegalStateException

Close() called with active block appender.

Error message

Close() called with active block appender.

What it means

Error "Close() called with active block appender." thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/BCFile.java:315

      metaIndex = new MetaIndex();
      fsOutputBuffer = new BytesWritable();
      Magic.write(fout);
    }

    /**
     * Close the BCFile Writer. Attempting to use the Writer after calling
     * <code>close</code> is not allowed and may lead to undetermined results.
     */
    @Override
    public void close() throws IOException {
      if (closed == true) {
        return;
      }

      try {
        if (errorCount == 0) {
          if (blkInProgress == true) {
            throw new IllegalStateException(
                "Close() called with active block appender.");
          }

          // add metaBCFileIndex to metaIndex as the last meta block
          BlockAppender appender =
              prepareMetaBlock(DataIndex.BLOCK_NAME,
                  getDefaultCompressionAlgorithm());
          try {
            dataIndex.write(appender);
          } finally {
            appender.close();
          }

          long offsetIndexMeta = out.getPos();
          metaIndex.write(out);

          // Meta Index and the trailing section are written out directly.
          out.writeLong(offsetIndexMeta);

View on GitHub (pinned to 2add963021)

Solutions

1. Close the active block appender (finish the current data/meta block) before calling close() on the writer.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/BCFile.java:315 when the library encounters an invalid state.

Common situations: Occurs when close() is called on a BCFile writer while a block appender is still open. Close the active block appender before closing the writer.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/7115aba91db48418. Report an issue: GitHub.