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https://issues.apache.org/jira/browse/HDFS-5143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762609#comment-13762609
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Binglin Chang commented on HDFS-5143:
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Hi Yi Liu,
Nice document. I think one drawback of 16 bytes header is it breaks original
block boundaries assumptions, user think they are visit block 0 may visiting
block 1 instead. I wonder if each file has a different key in key store, we can
just put 16 bytes header in key store? I see you may want to manage key in per
dir level or per file level, how about make file header optional, and when key
is per file, we can omit 16 byte headers?
> Hadoop cryptographic file system
> --------------------------------
>
> Key: HDFS-5143
> URL: https://issues.apache.org/jira/browse/HDFS-5143
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: security
> Affects Versions: 3.0.0
> Reporter: Yi Liu
> Labels: rhino
> Fix For: 3.0.0
>
> Attachments: HADOOP cryptographic file system.pdf
>
>
> There is an increasing need for securing data when Hadoop customers use
> various upper layer applications, such as Map-Reduce, Hive, Pig, HBase and so
> on.
> HADOOP CFS (HADOOP Cryptographic File System) is used to secure data, based
> on HADOOP “FilterFileSystem” decorating DFS or other file systems, and
> transparent to upper layer applications. It’s configurable, scalable and fast.
> High level requirements:
> 1. Transparent to and no modification required for upper layer
> applications.
> 2. “Seek”, “PositionedReadable” are supported for input stream of CFS if
> the wrapped file system supports them.
> 3. Very high performance for encryption and decryption, they will not
> become bottleneck.
> 4. Can decorate HDFS and all other file systems in Hadoop, and will not
> modify existing structure of file system, such as namenode and datanode
> structure if the wrapped file system is HDFS.
> 5. Admin can configure encryption policies, such as which directory will
> be encrypted.
> 6. A robust key management framework.
> 7. Support Pread and append operations if the wrapped file system supports
> them.
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