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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