/// <summary>Helper function that generates the decommissioning report.</summary>
/// <remarks>
/// Helper function that generates the decommissioning report. Connect to each
/// Namenode over http via JmxJsonServlet to collect the data nodes status.
/// </remarks>
internal virtual ClusterJspHelper.DecommissionStatus GenerateDecommissioningReport
()
{
string clusterid = string.Empty;
Configuration conf = new Configuration();
IList <DFSUtil.ConfiguredNNAddress> cnns = null;
try
{
cnns = DFSUtil.FlattenAddressMap(DFSUtil.GetNNServiceRpcAddresses(conf));
}
catch (Exception e)
{
// catch any exception encountered other than connecting to namenodes
ClusterJspHelper.DecommissionStatus dInfo = new ClusterJspHelper.DecommissionStatus
(clusterid, e);
return(dInfo);
}
// Outer map key is datanode. Inner map key is namenode and the value is
// decom status of the datanode for the corresponding namenode
IDictionary <string, IDictionary <string, string> > statusMap = new Dictionary <string
, IDictionary <string, string> >();
// Map of exceptions encountered when connecting to namenode
// key is namenode and value is exception
IDictionary <string, Exception> decommissionExceptions = new Dictionary <string, Exception
>();
IList <string> unreportedNamenode = new AList <string>();
foreach (DFSUtil.ConfiguredNNAddress cnn in cnns)
{
IPEndPoint isa = cnn.GetAddress();
ClusterJspHelper.NamenodeMXBeanHelper nnHelper = null;
try
{
nnHelper = new ClusterJspHelper.NamenodeMXBeanHelper(isa, conf);
string mbeanProps = QueryMbean(nnHelper.httpAddress, conf);
if (clusterid.Equals(string.Empty))
{
clusterid = nnHelper.GetClusterId(mbeanProps);
}
nnHelper.GetDecomNodeInfoForReport(statusMap, mbeanProps);
}
catch (Exception e)
{
// catch exceptions encountered while connecting to namenodes
string nnHost = isa.GetHostName();
decommissionExceptions[nnHost] = e;
unreportedNamenode.AddItem(nnHost);
continue;
}
}
UpdateUnknownStatus(statusMap, unreportedNamenode);
GetDecommissionNodeClusterState(statusMap);
return(new ClusterJspHelper.DecommissionStatus(statusMap, clusterid, GetDatanodeHttpPort
(conf), decommissionExceptions));
}
/// <summary>JSP helper function that generates cluster health report.</summary>
/// <remarks>
/// JSP helper function that generates cluster health report. When
/// encountering exception while getting Namenode status, the exception will
/// be listed on the page with corresponding stack trace.
/// </remarks>
internal virtual ClusterJspHelper.ClusterStatus GenerateClusterHealthReport()
{
ClusterJspHelper.ClusterStatus cs = new ClusterJspHelper.ClusterStatus();
Configuration conf = new Configuration();
IList <DFSUtil.ConfiguredNNAddress> nns = null;
try
{
nns = DFSUtil.FlattenAddressMap(DFSUtil.GetNNServiceRpcAddresses(conf));
}
catch (Exception e)
{
// Could not build cluster status
cs.SetError(e);
return(cs);
}
// Process each namenode and add it to ClusterStatus
foreach (DFSUtil.ConfiguredNNAddress cnn in nns)
{
IPEndPoint isa = cnn.GetAddress();
ClusterJspHelper.NamenodeMXBeanHelper nnHelper = null;
try
{
nnHelper = new ClusterJspHelper.NamenodeMXBeanHelper(isa, conf);
string mbeanProps = QueryMbean(nnHelper.httpAddress, conf);
ClusterJspHelper.NamenodeStatus nn = nnHelper.GetNamenodeStatus(mbeanProps);
if (cs.clusterid.IsEmpty() || cs.clusterid.Equals(string.Empty))
{
// Set clusterid only once
cs.clusterid = nnHelper.GetClusterId(mbeanProps);
}
cs.AddNamenodeStatus(nn);
}
catch (Exception e)
{
// track exceptions encountered when connecting to namenodes
cs.AddException(isa.GetHostName(), e);
continue;
}
}
return(cs);
}
