alluxio

Why do mtime and atime need to be updated?

Does anyone know why the mtime and atime need to be updated when completing the file?

mInodeTree.updateInode(rpcContext, UpdateInodeEntry.newBuilder()

    .setId(inode.getId())
    .setUfsFingerprint(ufsFingerprint)
    .setLastModificationTimeMs(opTimeMs) // mtime?
    .setLastAccessTimeMs(opTimeMs) // atime?
    .setOverwriteModificationTime(true)
    .build();
mInodeTree.updateInodeFile(rpcContext, entry.build());
Solution

  • In the early days when Alluxio is mostly used for Spark or MR for storing really large files, we were thinking the completion could take a while, thus the completion time may better reflect the mtime and atime. I don’t think there is any particular technical reason behind that