class FileBasedTopologyMapper extends TopologyMapper with Logging
A simple file based topology mapper. This expects topology information provided as a
java.util.Properties
file. The name of the file is obtained from SparkConf property
spark.storage.replication.topologyFile
. To use this topology mapper, set the
spark.storage.replication.topologyMapper
property to
org.apache.spark.storage.FileBasedTopologyMapper
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def
getTopologyForHost(hostname: String): Option[String]
Gets the topology information given the host name
Gets the topology information given the host name
- hostname
Hostname
- returns
topology information for the given hostname. One can use a 'topology delimiter' to make this topology information nested. For example : ‘/myrack/myhost’, where ‘/’ is the topology delimiter, ‘myrack’ is the topology identifier, and ‘myhost’ is the individual host. This function only returns the topology information without the hostname. This information can be used when choosing executors for block replication to discern executors from a different rack than a candidate executor, for example. An implementation can choose to use empty strings or None in case topology info is not available. This would imply that all such executors belong to the same rack.
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- val topologyFile: Option[String]
- val topologyMap: Map[String, String]
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