Regarding Hadoop failure and new HBase?

I have 2 questions:

1. Is NameNode still single point of failure in Hadoop YARN or new version of Hadoop e.g. 2.5?

What is the single point of failure in Hadoop?

2.  I saw Facebook is using HydraBase. Is HydraBase new version Hbase or is it new DBMS similar to Hbase?

Does HydraBase have Apache version or is it open source?

Thanks!

Copyright Notice：Content Author:「Raj baba」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/28078519/regarding-hadoop-failure-and-new-hbase

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