What purpose does extended attributes have?

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  • bcapps

    It can be used to store metadata that takes a long time to compute. For example, when I thought image hashing took a long time, I wrote https://github.com/barrycarter/bcapps/blob/master/imagehash.pl which stores the image hash in an xattr, so I can get to it faster after I've computed it once. However, it turns out the time savings is trivial, possibly non-existent. You could also do it with a cryptographic hash, but, unless your files are really large, you won't really save any time.

  • BorgBackup

    Deduplicating archiver with compression and authenticated encryption.

    I see that while rdiff-backup, rsync --xattr and BorgBackup (all of which I use) save the extended attributes, my online backup (SpiderOakONE) doesn't. So, that's something to take into account.

  • InfluxDB

    Build time-series-based applications quickly and at scale.. InfluxDB is the Time Series Data Platform where developers build real-time applications for analytics, IoT and cloud-native services in less time with less code.

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