FAQ

Alluxio Frequently Asked Questions.

  1. What is Alluxio?

    Alluxio, formerly Tachyon, is an open source, memory speed, virtual distributed storage. It enables any application to interact with any data from any storage system at memory speed.

  2. What platforms and Java versions does Alluxio run on?

    Alluxio can run with Java 1.7 or above on various distributions of Linux / Mac.

  3. Is there an easy way to see the status and health of a cluster?

    Yes, Once Alluxio is installed, the UI is available at http://master_ip:19999

  4. If I add new nodes to the cluster, will Alluxio re-balance / move the cached blocks to the newly added nodes in order to balance memory space utilization between the nodes?

    No, Currently re-balancing of data blocks in not available.

  5. Is Alluxio master fault tolerant?

    Yes. Please see this page.

  6. What are under storage systems and how many under storage systems are supported?

    Alluxio uses under storage systems as its persistent storage system. It currently supports Amazon S3, Swift, GCS , HDFS and many more.

  7. Can I easily add support for other under store systems?

    Yes, in fact support for other under storages is in progress by many contributors. Here is the introduction to adding other under storage systems.

  8. In which language is Alluxio developed?

    Alluxio is primarily developed in Java and exposes Java-like File APIs for other applications to interact with. We are working on other language bindings though.

  9. What happens if my data set does not fit in memory?

    Depends on the system setup, Alluxio may leverage local SSD and HDD. It keeps hot data in Alluxio, and cold data in under storage systems. You can read more about tiered storage setup here.

  10. Can I run Alluxio as a stand-alone system for experimenting and validation?

    Yes, Alluxio can run as a stand-alone system. Instructions are available here.

  11. Can I run Alluxio in a cluster mode?

    Yes, Alluxio can be run in a cluster mode. Instructions are available here.

  12. Does Alluxio always need HDFS?

    No, Alluxio runs on different under storage systems like HDFS, Amazon S3, Swift and GlusterFS.

  13. Does Alluxio work alongside with other Frameworks?

    Yes, Alluxio works with Spark, Flink, Hadoop, HBase, Hive, etc.

  14. How can I learn more about Alluxio?

    You can read the recent blogs and presentations.

  15. Are there any meetups for Alluxio?

    Yes. We have started meetup group for Alluxio and please join http://www.meetup.com/Alluxio/. You can also find more Alluxio events here.

  16. What license is Alluxio under?

    Alluxio is under the Apache 2.0 license.

  17. How can I contribute to Alluxio?

    Thank you for the interest to contribute. Please look into Contributing-to- Alluxio. Also, please look into some of the JIRA issues (marked for New Contributors) here

  18. Where can I report issues or propose new features?

    We use JIRA to track development and issues. If you would like to report an issue or propose a feature, post it to the JIRA Alluxio issue tracker. You need to register before posting.

  19. Where can I get more help?

    For any questions related installation, contribution and comments please post an email to Alluxio User Mailing List. We look forward to seeing you there.

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