Zhe Zhang created HDFS-7354:
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Summary: Support parity blocks in block management
Key: HDFS-7354
URL: https://issues.apache.org/jira/browse/HDFS-7354
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Zhe Zhang
Assignee: Zhe Zhang
In the current block management system, each block is associated with a file.
"Orphan" blocks are considered corrupt and will be removed.
In this JIRA we extend {{Block}} with a binary flag denoting whether it is a
parity block ({{isParity}}). Parity blocks are created, stored, and reported
the same way as raw ones. They have regular block IDs which are unrelated to
those of the raw blocks in the same group; their replicas (normally only 1) are
stored in RBW and finalized directories on the DataNode depending on the stage;
they are also included in block reports. The only distinction of a parity block
is the lack of file affiliation. The block management system will be aware of
parity blocks and will _not_ try to remove them.
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