apache/hadoop · error · IllegalStateException

Cannot create Meta Block until previous block is closed.

Error message

Cannot create Meta Block until previous block is closed.

What it means

Error "Cannot create Meta Block until previous block is closed." thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/BCFile.java:351

          out.writeLong(offsetIndexMeta);

          API_VERSION.write(out);
          Magic.write(out);
          out.flush();
        }
      } finally {
        closed = true;
      }
    }

    private Algorithm getDefaultCompressionAlgorithm() {
      return dataIndex.getDefaultCompressionAlgorithm();
    }

    private BlockAppender prepareMetaBlock(String name, Algorithm compressAlgo)
        throws IOException, MetaBlockAlreadyExists {
      if (blkInProgress == true) {
        throw new IllegalStateException(
            "Cannot create Meta Block until previous block is closed.");
      }

      if (metaIndex.getMetaByName(name) != null) {
        throw new MetaBlockAlreadyExists("name=" + name);
      }

      MetaBlockRegister mbr = new MetaBlockRegister(name, compressAlgo);
      WBlockState wbs =
          new WBlockState(compressAlgo, out, fsOutputBuffer, conf);
      BlockAppender ba = new BlockAppender(mbr, wbs);
      blkInProgress = true;
      metaBlkSeen = true;
      return ba;
    }

    /**
     * Create a Meta Block and obtain an output stream for adding data into the

View on GitHub (pinned to 2add963021)

Solutions

1. Close the previous block before preparing a new meta block; do not interleave block creation.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/BCFile.java:351 when the library encounters an invalid state.

Common situations: Occurs when a new Meta Block is started while a previous block is still open. Close the previous block before preparing a new meta block.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/4de3eaae230fd7a1. Report an issue: GitHub.