Public

parseEntry

Set the includes and excludes lists by the new HostSet instances. The old
instances are discarded.

refresh

isExcluded

readFile

getExcludes

getIncludes

isIncluded

resolvedAddressFromDatanodeID

<init>

Making http post requests using okhttp

This exception is thrown when a timeout expired on a socket read or accept
operation.

java.net.SocketTimeoutException

This class consists exclusively of static methods that operate on or return
collections. It contains

java.util.Collections

 GregorianCalendar is a concrete subclass of Calendarand provides the standard
calendar used by most

java.util.GregorianCalendar

An int value that may be updated atomically. See the java.util.concurrent.atomic
package specificati

java.util.concurrent.atomic.AtomicInteger

General IO stream manipulation utilities. This class provides static utility
methods for input/outpu

org.apache.commons.io.IOUtils

org.openjdk.jmh.runner.Runner

putExtra

Return the contained value, if present, otherwise throw an exception to be
created by the provided s

orElseThrow

notifyDataSetChanged

/**
   * 1. Added to hosts  --> no further work needed here.
   * 2. Removed from hosts --> mark AdminState as decommissioned. 
   * 3. Added to exclude --> start decommission.
   * 4. Removed from exclude --> stop decommission.
   */

// The remaining nodes are ones that are referenced by the hosts

// files but that we do not know about, ie that we have never

// head from. Eg. an entry that is no longer part of the cluster

// or a bogus entry was given in the hosts files

// If the host file entry specified the xferPort, we use that.

// Otherwise, we guess that it is the default xfer port.

// We can't ask the DataNode what it had configured, because it's

/**
   * Register the given datanode with the namenode. NB: the given
   * registration is mutated and given back to the datanode.
   *
   * @param nodeReg the datanode registration
   * @throws DisallowedDatanodeException if the registration request is
   *    denied because the datanode does not match includes/excludes
   * @throws UnresolvedTopologyException if the registration request is 
   *    denied because resolving datanode network location fails.
   */

// Mostly called inside an RPC, update ip and peer hostname

// Reject registration of unresolved datanode to prevent performance

// impact of repetitive DNS lookups later.

// update node registration with the ip and hostname from rpc request

// Checks if the node is not on the hosts list.  If it is not, then

// it will be disallowed from registering. 

// nodeN previously served a different data storage, 

// which is not served by anybody anymore.

// physically remove node from datanodeMap

// The same datanode has been just restarted to serve the same data 

// storage. We do not need to remove old data blocks, the delta will

// be calculated on the next block report from the datanode

/* The registering datanode is a replacement node for the existing 
            data storage, which from now on will be served by a new node.
            If this message repeats, both nodes might have same storageID 
            by (insanely rare) random chance. User needs to restart one of the
            nodes with its data cleared (or user can just remove the StorageID
            value in "VERSION" file under the data directory of the datanode,
            but this is might not work if VERSION file format has changed 
         */

// also treat the registration message as a heartbeat

// because its is done when the descriptor is created

// If the network location is invalid, clear the cached mappings

// so that we have a chance to re-add this DataNode with the

// clear cache for nodes in IP or Hostname

How to use isIncludedmethodin org.apache.hadoop.hdfs.server.blockmanagement.HostFileManager

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How to use
isIncluded
method
in
org.apache.hadoop.hdfs.server.blockmanagement.HostFileManager