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From "Uma Maheswara Rao G (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3301) Add public waitOnSafeMode API as HdfsUtils
Date Thu, 19 Apr 2012 04:33:55 GMT
Add public waitOnSafeMode API as HdfsUtils 
-------------------------------------------

                 Key: HDFS-3301
                 URL: https://issues.apache.org/jira/browse/HDFS-3301
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: hdfs client
    Affects Versions: 3.0.0
            Reporter: Uma Maheswara Rao G
            Assignee: Uma Maheswara Rao G


Add public waitOnSafeMode API as HdfsUtils.
I have seen this util api in Hbase and using FSCOnstants in it. Currently that is deprecated
and moved the SafeModeActions to HdfsConstants and also marked as private audience. So, it
wil help adding such api in HdfsUtils itself to avoid the need of accessing HdfsConstants.

from Hbase FSUtils class.

{code}
 /**
   * If DFS, check safe mode and if so, wait until we clear it.
   * @param conf configuration
   * @param wait Sleep between retries
   * @throws IOException e
   */
  public static void waitOnSafeMode(final Configuration conf,
    final long wait)
  throws IOException {
    FileSystem fs = FileSystem.get(conf);
    if (!(fs instanceof DistributedFileSystem)) return;
    DistributedFileSystem dfs = (DistributedFileSystem)fs;
    // Make sure dfs is not in safe mode
    while (dfs.setSafeMode(org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction.SAFEMODE_GET))
{
      LOG.info("Waiting for dfs to exit safe mode...");
      try {
        Thread.sleep(wait);
      } catch (InterruptedException e) {
        //continue
      }
    }
  }
{code}

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