Konstantin Shvachko created HDFS-15567:
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Summary: [SBN Read] HDFS should expose msync() API to allow
downstream applications call it explicetly.
Key: HDFS-15567
URL: https://issues.apache.org/jira/browse/HDFS-15567
Project: Hadoop HDFS
Issue Type: Improvement
Components: ha, hdfs-client
Reporter: Konstantin Shvachko
Consistent reads from Standby introduced {{msync()}} API HDFS-13688, which
updates client's state ID with current state of the Active NameNode to
guarantee consistency of subsequent calls to an ObserverNode. Currently this
API is exposed via {{DFSClient}} only, which makes it hard for applications to
access {{msync()}}. One way is to use something like this:
{code}
if(fs instanceof DistributedFileSystem) {
((DistributedFileSystem)fs).getClient().msync();
}
{code}
This should be exposed both for {{FileSystem}} and {{FileContext}}.
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