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https://issues.apache.org/jira/browse/HADOOP-18671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17713631#comment-17713631
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ASF GitHub Bot commented on HADOOP-18671:
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steveloughran commented on PR #5553:
URL: https://github.com/apache/hadoop/pull/5553#issuecomment-1513370122
there must still be a CommonPathCapabilities name as we will also need to
have to consider about having
* filterfs implement and pass through to the wrapped fs
* viewfs to pass down to resolved fs.
a cast and a hasPathCapability() is the safe way, as for any of the wrappers
it will let you know if the method works all the way through.
oh, and if we do the viewfs/filterfs (which I don't think we need...yet),
then we will need tests that they pass through to hdfs.
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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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