apache/hadoop · error · UnsupportedOperationException

Cannot truncate file with striped block {}

Error message

Cannot truncate file with striped block {}

What it means

Error "Cannot truncate file with striped block {}" thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirTruncateOp.java:93

    assert fsn.hasWriteLock(RwLockMode.GLOBAL);

    FSDirectory fsd = fsn.getFSDirectory();
    final String src;
    final INodesInPath iip;
    final boolean onBlockBoundary;
    Block truncateBlock = null;
    fsd.writeLock();
    try {
      iip = fsd.resolvePath(pc, srcArg, DirOp.WRITE);
      src = iip.getPath();
      if (fsd.isPermissionEnabled()) {
        fsd.checkPathAccess(pc, iip, FsAction.WRITE);
      }
      INodeFile file = INodeFile.valueOf(iip.getLastINode(), src);

      // not support truncating file with striped blocks
      if (file.isStriped()) {
        throw new UnsupportedOperationException(
            "Cannot truncate file with striped block " + src);
      }

      final BlockStoragePolicy lpPolicy = fsd.getBlockManager()
          .getStoragePolicy("LAZY_PERSIST");

      if (lpPolicy != null && lpPolicy.getId() == file.getStoragePolicyID()) {
        throw new UnsupportedOperationException(
            "Cannot truncate lazy persist file " + src);
      }

      // Check if the file is already being truncated with the same length
      final BlockInfo last = file.getLastBlock();
      if (last != null && last.getBlockUCState()
          == BlockUCState.UNDER_RECOVERY) {
        final BlockInfo truncatedBlock = last.getUnderConstructionFeature()
            .getTruncateBlock();
        if (truncatedBlock != null) {

View on GitHub (pinned to 2add963021)

Solutions

1. Truncation of erasure-coded (striped) files is not supported; rewrite the file to the desired length instead.
2. Copy the needed prefix to a new file and delete the original.

When it happens

Trigger: Truncating an erasure coded (striped) file whose last block is a striped block; truncate is only supported for EC files at block group boundaries.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/52e0fc08a4de8d45. Report an issue: GitHub.