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< h1 > < a name = "LeaseRecoverable" > < / a > interface < code > LeaseRecoverable< / code > < / h1 >
< p > The < code > LeaseRecoverable< / code > interface tells whether a given path of current filesystem can perform lease recovery for open file that a lease is not explicitly renewed or the client holding it goes away.< / p >
< p > This interface should be implemented accordingly when necessary to any Filesystem that supports lease recovery, e.g. < code > DistributedFileSystem< / code > (HDFS) and < code > ViewDistributedFileSystem< / code > .< / p >
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< pre > public interface LeaseRecoverable {
boolean recoverLease(Path file) throws IOException;
boolean isFileClosed(Path file) throws IOException;
}
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< p > There are two main functions of this interface, one performs lease recovery and another one verifies if a file has been closed.< / p > < section > < section >
< h3 > < a name = "boolean_recoverLease.28Path_file.29" > < / a > boolean recoverLease(Path file)< / h3 >
< p > This function performs the lease recovery for the given file path, and it does not support directory path recovery. 1. Return < code > true< / code > , if the file has already closed, or does not require lease recovery. 1. Return < code > false< / code > , if the lease recovery is yet completed. 1. Throw < code > IOException< / code > if a directory path is given as input.< / p > < / section > < section >
< h3 > < a name = "boolean_isFileClosed.28Path_file.29" > < / a > boolean isFileClosed(Path file)< / h3 >
< p > This function only checks if the give file path has been closed, and it does not support directory verification. 1. Return < code > true< / code > , if the file has been closed. 1. Return < code > false< / code > , if the file is still open. 1. Throw < code > IOException< / code > if a directory path is given as input.< / p > < / section > < section >
< h3 > < a name = "Path_Capabilities_SHOULD_BE_declared" > < / a > Path Capabilities SHOULD BE declared< / h3 >
< p > If a filesystem supports < code > LeaseRecoverable< / code > , it should return < code > true< / code > to < code > PathCapabilities.hasPathCapability(path, " fs.capability.lease.recoverable" )< / code > for a given path.< / p > < / section > < / section >
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