Zhe Zhang created HDFS-7955:
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Summary: Improve naming of classes, methods, and variables related
to block replication and recovery
Key: HDFS-7955
URL: https://issues.apache.org/jira/browse/HDFS-7955
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Zhe Zhang
Many existing names should be revised to avoid confusion when blocks can be
both replicated and erasure coded. This JIRA aims to solicit opinions on making
those names more consistent and intuitive.
# In current HDFS _block recovery_ refers to the process of finalizing the last
block of a file, triggered by _lease recovery_. It is different from the
intuitive meaning of _recovering a lost block_. To avoid confusion, I can think
of 2 options:
#* Rename this process as _block finalization_ or _block completion_. I prefer
this option because this is literally not a recovery.
#* If we want to keep existing terms unchanged we can name all EC recovery and
re-replication logics as _reconstruction_.
# As Kai [suggested |
https://issues.apache.org/jira/browse/HDFS-7369?focusedCommentId=14361131&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14361131]
under HDFS-7369, several replication-based names should be made more generic:
#* {{UnderReplicatedBlocks}} and {{neededReplications}}. E.g. we can use
{{LowRedundancyBlocks}}/{{AtRiskBlocks}}, and
{{neededRecovery}}/{{neededReconstruction}}.
# {{PendingReplicationBlocks}}
# {{ReplicationMonitor}}
I'm sure the above list is incomplete; discussions and comments are very
welcome.
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