apache/hadoop · error · NullPointerException

ZstdCompressCtx is not initialized

Error message

ZstdCompressCtx is not initialized

What it means

Error "ZstdCompressCtx is not initialized" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/zstd/ZStandardCompressor.java:329

    userBufLen = 0;
  }

  @Override
  public void end() {
    if (zstdJniCtx != null) {
      zstdJniCtx.close();
      zstdJniCtx = null;
    }
  }

  @Override
  protected void finalize() {
    end();
  }

  private void checkStream() {
    if (zstdJniCtx == null) {
      throw new NullPointerException("ZstdCompressCtx is not initialized");
    }
  }
}

View on GitHub (pinned to 2add963021)

Solutions

1. Ensure the native zstd library is loaded and the compressor was properly initialized before use; check the native library load logs.
2. Re-create the ZStandardCompressor instead of reusing one whose native context was released.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/zstd/ZStandardCompressor.java:329 when the library encounters an invalid state.

Common situations: Occurs when the native Zstd compression context has not been initialized (e.g., init not called or after close/finish). Ensure the compressor is properly initialized and not finished before compressing.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/05191194cd0e88ca. Report an issue: GitHub.