Wei-Chiu Chuang created HADOOP-18671:
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Summary: Add recoverLease(), setSafeMode(), isFileClosed() APIs to
FileSystem
Key: HADOOP-18671
URL: https://issues.apache.org/jira/browse/HADOOP-18671
Project: Hadoop Common
Issue Type: New Feature
Components: fs
Reporter: Wei-Chiu Chuang
We are in the midst of enabling HBase and Solr to run on Ozone.
An obstacle is that HBase relies heavily on HDFS APIs and semantics for its
Write Ahead Log (WAL) file (similarly, for Solr's transaction log). We propose
to push up these HDFS APIs, i.e. recoverLease(), setSafeMode(), isFileClosed()
to FileSystem abstraction so that HBase and other applications do not need to
take on Ozone dependency at compile time. This work will (hopefully) enable
HBase to run on other storage system implementations in the future.
There are other HDFS features that HBase uses, including hedged read and
favored nodes. Those are FS-specific optimizations and are not critical to
enable HBase on Ozone.
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