Hi,
In Hbase getting started, there's someting about ZooKeeper quorum count.
Maybe you just set one ZooKeeper quorum , trying to set more ZooKeeper
quorums.
I think it could be ok!
Fleming
It is recommended to run a ZooKeeper quorum of 5 or 7 machines, and give
each server around 1GB to ensure that they don't swap. It is also
recommended to run the ZooKeeper servers on separate machines from the
Region Servers with their own disks. If this is not easily doable for you,
choose 5 of your region servers to run the ZooKeeper servers on.
elsif
<elsif.t...@gmail To:
[email protected]
.com> cc: (bcc: Y_823910/TSMC)
Subject: Hbase 0.20.0 threading
issue
2009/09/10 09:07
AM
Please respond to
hbase-user
Hello. We are trying to use Hbase in a threaded application and are
encountering an issue with the ZooKeeper connection being lost:
org.apache.hadoop.hbase.client.NoServerForRegionException: Timed out
trying to locate root region
The following sample program returns 10 results and 10 of the above
errors. Code was compiled against the 0.20.0 svn fork and the
pre-compiled Hadoop 0.20.0 release.
import java.io.IOException;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.util.Bytes;
// create 'fc_test', {NAME => 'json', VERSIONS => 1}, {NAME => 'data',
VERSIONS =>1}
// put 'fc_test', 'testing123', 'json:', "[1,2,3]"
public class TableTest extends Thread {
public void run() {
try {
String key = "testing123";
HBaseConfiguration conf = new HBaseConfiguration();
HTable table = new HTable(conf, "fc_test");
Get get = new Get(Bytes.toBytes(key));
get.addFamily(Bytes.toBytes("json"));
Result result = table.get(get);
KeyValue[] kvs = result.raw();
System.out.println(Bytes.toString(kvs[0].getValue()));
} catch (Exception e) {
System.out.println(e.toString());
}
try {
Thread.currentThread().sleep(1000);
} catch (Exception e) {
}
}
public static void main(String args[]) throws IOException {
Thread t = null;
int i;
for (i = 0; i< 20; i++) {
t = new TableTest();
t.start();
}
// wait for last thread
try {
t.join();
} catch (InterruptedException e) {
}
}
}
#!/bin/bash
export
CLASSPATH=.:/opt/hbase/conf:/opt/hbase/build/hbase-0.20.0.jar:/opt/hbase/lib/AgileJSON-2009-03-30.jar:/opt/hbase/lib/commons-cli-2.0-SNAPSHOT.jar:/opt/hbase/lib/commons-el-from-jetty-5.1.4.jar:/opt/hbase/lib/commons-httpclient-3.0.1.jar:/opt/hbase/lib/commons-logging-1.0.4.jar:/opt/hbase/lib/commons-logging-api-1.0.4.jar:/opt/hbase/lib/commons-math-1.1.jar:/opt/hbase/lib/hadoop-0.20.0-plus4681-core.jar:/opt/hbase/lib/hadoop-0.20.0-test.jar:/opt/hbase/lib/hadoop-gpl-compression-0.1.0-dev.jar:/opt/hbase/lib/jasper-compiler-5.5.12.jar:/opt/hbase/lib/jasper-runtime-5.5.12.jar:/opt/hbase/lib/jetty-6.1.14.jar:/opt/hbase/lib/jetty-util-6.1.14.jar:/opt/hbase/lib/jruby-complete-1.2.0.jar:/opt/hbase/lib/json.jar:/opt/hbase/lib/junit-3.8.1.jar:/opt/hbase/lib/libthrift-r771587.jar:/opt/hbase/lib/log4j-1.2.15.jar:/opt/hbase/lib/lucene-core-2.2.0.jar:/opt/hbase/lib/servlet-api-2.5-6.1.14.jar:/opt/hbase/lib/xmlenc-0.52.jar:/opt/hbase/lib/zookeeper-r785019-hbase-1329.jar
javac -classpath ${CLASSPATH} TableTest.java
java -classpath ${CLASSPATH} TableTest 2>err.log
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