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update cassandra README.md

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Daniel Smith 2015-05-26 15:42:49 -07:00
parent caf5b5f059
commit 13d99aa961
1 changed files with 3 additions and 100 deletions
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103
examples/cassandra/README.md
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@ -26,7 +26,7 @@ spec:
- /run.sh
resources:
limits:
cpu: "1"
cpu: "1"
image: kubernetes/cassandra:v2
name: cassandra
ports:
@ -261,105 +261,8 @@ kubectl resize rc cassandra --replicas=4
```
### Seed Provider Source
```java
package io.k8s.cassandra;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.net.URL;
import java.net.URLConnection;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.annotate.JsonIgnoreProperties;
import org.codehaus.jackson.map.ObjectMapper;
import org.apache.cassandra.locator.SeedProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class KubernetesSeedProvider implements SeedProvider {
@JsonIgnoreProperties(ignoreUnknown = true)
static class Endpoints {
public String[] endpoints;
}
private static String getEnvOrDefault(String var, String def) {
String val = System.getenv(var);
if (val == null) {
val = def;
}
return val;
}
private static final Logger logger = LoggerFactory.getLogger(KubernetesSeedProvider.class);
private List defaultSeeds;
public KubernetesSeedProvider(Map<String, String> params) {
// Taken from SimpleSeedProvider.java
// These are used as a fallback, if we get nothing from k8s.
String[] hosts = params.get("seeds").split(",", -1);
defaultSeeds = new ArrayList<InetAddress>(hosts.length);
for (String host : hosts)
{
try {
defaultSeeds.add(InetAddress.getByName(host.trim()));
}
catch (UnknownHostException ex)
{
// not fatal... DD will bark if there end up being zero seeds.
logger.warn("Seed provider couldn't lookup host " + host);
}
}
}
public List<InetAddress> getSeeds() {
List<InetAddress> list = new ArrayList<InetAddress>();
String protocol = getEnvOrDefault("KUBERNETES_API_PROTOCOL", "http");
String hostName = getEnvOrDefault("KUBERNETES_RO_SERVICE_HOST", "localhost");
String hostPort = getEnvOrDefault("KUBERNETES_RO_SERVICE_PORT", "8080");
String host = protocol + "://" + hostName + ":" + hostPort;
String serviceName = getEnvOrDefault("CASSANDRA_SERVICE", "cassandra");
String path = "/api/v1beta3/endpoints/";
try {
URL url = new URL(host + path + serviceName);
ObjectMapper mapper = new ObjectMapper();
Endpoints endpoints = mapper.readValue(url, Endpoints.class);
if (endpoints != null) {
// Here is a problem point, endpoints.endpoints can be null in first node cases.
if (endpoints.endpoints != null){
for (String endpoint : endpoints.endpoints) {
String[] parts = endpoint.split(":");
list.add(InetAddress.getByName(parts[0]));
}
}
}
} catch (IOException ex) {
logger.warn("Request to kubernetes apiserver failed");
}
if (list.size() == 0) {
// If we got nothing, we might be the first instance, in that case
// fall back on the seeds that were passed in cassandra.yaml.
return defaultSeeds;
}
return list;
}
// Simple main to test the implementation
public static void main(String[] args) {
SeedProvider provider = new KubernetesSeedProvider(new HashMap<String, String>());
System.out.println(provider.getSeeds());
}
}
```
See
[here](https://github.com/GoogleCloudPlatform/kubernetes/blob/master/examples/cassandra/java/src/io/k8s/cassandra/KubernetesSeedProvider.java).
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