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https://issues.apache.org/jira/browse/HADOOP-18671?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran reassigned HADOOP-18671:
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Assignee: Tak-Lon (Stephen) Wu
> 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
> Assignee: Tak-Lon (Stephen) Wu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> 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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