Example usage for org.apache.hadoop.fs FileStatus compareTo

Introduction

In this page you can find the example usage for org.apache.hadoop.fs FileStatus compareTo.

Prototype

@Override
public int compareTo(Object o) 

Source Link

Document

Compare this FileStatus to another FileStatus.

Usage

From source file:org.oclc.firefly.hadoop.backup.BackupUtils.java

License:Apache License

/**
 * Looks under the table directory in the filesystem for files with a '.tableinfo' prefix. Returns
 * reference to the 'latest' instance./*from  w  ww .  j  a  va 2 s  . co  m*/
 * 
 * @param fs The filesytem where to look
 * @param tableDirPath the hdfs table directory
 * @return The 'current' tableinfo file.
 * @throws IOException If failed to read from file system
 */
public static FileStatus getTableInfoPath(final FileSystem fs, final Path tableDirPath) throws IOException {
    FileStatus ret = null;
    FileStatus[] status = FSUtils.listStatus(fs, tableDirPath, new PathFilter() {
        @Override
        public boolean accept(Path p) {
            // Accept any file that starts with TABLEINFO_NAME
            return p.getName().startsWith(FSTableDescriptors.TABLEINFO_NAME);
        }
    });

    if (status != null && status.length > 0) {
        Arrays.sort(status, new Comparator<FileStatus>() {
            @Override
            public int compare(FileStatus left, FileStatus right) {
                return -left.compareTo(right);
            }
        });

        if (status.length > 1) {
            // Clean away old versions of .tableinfo
            for (int i = 1; i < status.length; i++) {
                Path p = status[i].getPath();

                // Clean up old versions
                if (!fs.delete(p, false)) {
                    LOG.warn("Failed cleanup of " + status);
                } else {
                    LOG.debug("Cleaned up old tableinfo file " + p);
                }
            }
        }

        ret = status[0];
    }

    return ret;
}

---