Simple refactors in existing NN code to assist QuorumJournalManager extension
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Key: HDFS-3190
URL: https://issues.apache.org/jira/browse/HDFS-3190
Project: Hadoop HDFS
Issue Type: Sub-task
Components: name-node
Affects Versions: 2.0.0
Reporter: Todd Lipcon
Priority: Minor
This JIRA is for some simple refactors in the NN:
- refactor the code which writes the seen_txid file in NNStorage into a new
"LongContainingFile" utility class. This is useful for the JournalNode to
atomically/durably record its last promised epoch
- refactor the interface from FileJournalManager back to StorageDirectory to
use a StorageErrorReport interface. This allows FileJournalManager to be used
in isolation of a full StorageDirectory.
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