How could my Java client connect to zookeeper-elected leader

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How could my Java client connect to zookeeper-elected leader

wwwovbcom

I struggled with Alluxio 1.7 for months, but could not find a way to properly configure Java client following the instruction documents.

 

I tried to run the following client-side demo (on oss3):

public class testAll

{

        public static void main(String[] args)

        {

               // Configuration.set(PropertyKey.MASTER_HOSTNAME,"oss2");

Configuration.set(PropertyKey.ZOOKEEPER_ADDRESS,"oss2:2181,oss5:2181,oss3:2181");

FileSystem fs = FileSystem.Factory.get();

                String st = new String("/newfile2.txt");

AlluxioURI path = new AlluxioURI(st);

try{

FileOutStream out = fs.createFile(path);

out.write(80);

out.close();

                } catch(IOException|AlluxioException e){

System.out.println("Exceptions start from:\n");

e.printStackTrace();

                }

        }

}

 

Question: The Alluxio cluster is deployed as high-available mode, oss5 is the leader master elected by zookeeper, and oss2 is a candidate master. When I run the above demo on oss3, the following errors appear:

alluxio.exception.status.UnavailableException: Failed to connect to FileSystemMasterClient @ oss3/89.72.12.3:19998 after 43 attempts

        at alluxio.AbstractClient.connect(AbstractClient.java:230)

        at alluxio.AbstractClient.retryRPC(AbstractClient.java:302)

        at alluxio.client.file.RetryHandlingFileSystemMasterClient.createFile(RetryHandlingFileSystemMasterClient.java:115)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:123)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:114)

        at testAll.main(testAll.java:22)

 

My question is: the client can only try to connect to local master, and as a result, it cannot find the master located in oss2.

 

Background: I set the worker’s ‘alluxio-site.properties’ as follows. Is there any other configuration that should be specified?

# Common properties

alluxio.home=/root/Alluxio/

alluxio.zookeeper.enabled=true

alluxio.zookeeper.address=oss2:2181,oss5:2181,oss3:2181

#Master properties

# Security properties

# Worker properties

alluxio.worker.memory.size=10GB

# User properties

alluxio.underfs.address=/home/nfs

\

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Re: How could my Java client connect to zookeeper-elected leader

Andrew Audibert
Hi,

For the alluxio-site.properties to be used by your client, it needs to be on the client's classpath. Adding the file to the classpath should fix the issue.

Another way to fix the issue is to add

Configuration.set(PropertyKey.ZOOKEEPER_ENABLED, "true");

to your java method.

Hope that helps,
Andrew



On Tue, Aug 21, 2018 at 8:25 PM wwwovbcom <[hidden email]> wrote:

I struggled with Alluxio 1.7 for months, but could not find a way to properly configure Java client following the instruction documents.

 

I tried to run the following client-side demo (on oss3):

public class testAll

{

        public static void main(String[] args)

        {

               // Configuration.set(PropertyKey.MASTER_HOSTNAME,"oss2");

Configuration.set(PropertyKey.ZOOKEEPER_ADDRESS,"oss2:2181,oss5:2181,oss3:2181");

FileSystem fs = FileSystem.Factory.get();

                String st = new String("/newfile2.txt");

AlluxioURI path = new AlluxioURI(st);

try{

FileOutStream out = fs.createFile(path);

out.write(80);

out.close();

                } catch(IOException|AlluxioException e){

System.out.println("Exceptions start from:\n");

e.printStackTrace();

                }

        }

}

 

Question: The Alluxio cluster is deployed as high-available mode, oss5 is the leader master elected by zookeeper, and oss2 is a candidate master. When I run the above demo on oss3, the following errors appear:

alluxio.exception.status.UnavailableException: Failed to connect to FileSystemMasterClient @ oss3/89.72.12.3:19998 after 43 attempts

        at alluxio.AbstractClient.connect(AbstractClient.java:230)

        at alluxio.AbstractClient.retryRPC(AbstractClient.java:302)

        at alluxio.client.file.RetryHandlingFileSystemMasterClient.createFile(RetryHandlingFileSystemMasterClient.java:115)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:123)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:114)

        at testAll.main(testAll.java:22)

 

My question is: the client can only try to connect to local master, and as a result, it cannot find the master located in oss2.

 

Background: I set the worker’s ‘alluxio-site.properties’ as follows. Is there any other configuration that should be specified?

# Common properties

alluxio.home=/root/Alluxio/

alluxio.zookeeper.enabled=true

alluxio.zookeeper.address=oss2:2181,oss5:2181,oss3:2181

#Master properties

# Security properties

# Worker properties

alluxio.worker.memory.size=10GB

# User properties

alluxio.underfs.address=/home/nfs

\

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Re: How could my Java client connect to zookeeper-elected leader

wwwovbcom
Dear Andrew,

Thanks a lot for your valuable suggestions. I tried the second way, and it works well. 

I guess that means the client cannot find the configuration file: alluxio-site.propertperties. I tried to add the path to CLASSPATH in /etc/profile,and then source it. It seems that the client still cannot find the configuration file. Could you kindly tell me that how to add this file to the client's classpath? Thanks very much in advance.

Phillip





On Wednesday, 22 August 2018 11:34:41 UTC+8, Andrew Audibert wrote:
Hi,

For the alluxio-site.properties to be used by your client, it needs to be on the client's classpath. Adding the file to the classpath should fix the issue.

Another way to fix the issue is to add

Configuration.set(PropertyKey.ZOOKEEPER_ENABLED, "true");

to your java method.

Hope that helps,
Andrew



On Tue, Aug 21, 2018 at 8:25 PM wwwovbcom <<a href="javascript:" target="_blank" gdf-obfuscated-mailto="OQGXUeatAAAJ" rel="nofollow" onmousedown="this.href=&#39;javascript:&#39;;return true;" onclick="this.href=&#39;javascript:&#39;;return true;">wwwo...@...> wrote:

I struggled with Alluxio 1.7 for months, but could not find a way to properly configure Java client following the instruction documents.

 

I tried to run the following client-side demo (on oss3):

public class testAll

{

        public static void main(String[] args)

        {

               // Configuration.set(PropertyKey.MASTER_HOSTNAME,"oss2");

Configuration.set(PropertyKey.ZOOKEEPER_ADDRESS,"oss2:2181,oss5:2181,oss3:2181");

FileSystem fs = FileSystem.Factory.get();

                String st = new String("/newfile2.txt");

AlluxioURI path = new AlluxioURI(st);

try{

FileOutStream out = fs.createFile(path);

out.write(80);

out.close();

                } catch(IOException|AlluxioException e){

System.out.println("Exceptions start from:\n");

e.printStackTrace();

                }

        }

}

 

Question: The Alluxio cluster is deployed as high-available mode, oss5 is the leader master elected by zookeeper, and oss2 is a candidate master. When I run the above demo on oss3, the following errors appear:

alluxio.exception.status.UnavailableException: Failed to connect to FileSystemMasterClient @ oss3/<a href="http://89.72.12.3:19998" target="_blank" rel="nofollow" onmousedown="this.href=&#39;http://www.google.com/url?q\x3dhttp%3A%2F%2F89.72.12.3%3A19998\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNHbuhm35TWqG_xdd7-DhtaOpNdqRg&#39;;return true;" onclick="this.href=&#39;http://www.google.com/url?q\x3dhttp%3A%2F%2F89.72.12.3%3A19998\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNHbuhm35TWqG_xdd7-DhtaOpNdqRg&#39;;return true;">89.72.12.3:19998 after 43 attempts

        at alluxio.AbstractClient.connect(AbstractClient.java:230)

        at alluxio.AbstractClient.retryRPC(AbstractClient.java:302)

        at alluxio.client.file.RetryHandlingFileSystemMasterClient.createFile(RetryHandlingFileSystemMasterClient.java:115)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:123)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:114)

        at testAll.main(testAll.java:22)

 

My question is: the client can only try to connect to local master, and as a result, it cannot find the master located in oss2.

 

Background: I set the worker’s ‘alluxio-site.properties’ as follows. Is there any other configuration that should be specified?

# Common properties

alluxio.home=/root/Alluxio/

alluxio.zookeeper.enabled=true

alluxio.zookeeper.address=oss2:2181,oss5:2181,oss3:2181

#Master properties

# Security properties

# Worker properties

alluxio.worker.memory.size=10GB

# User properties

alluxio.underfs.address=/home/nfs

\

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Re: How could my Java client connect to zookeeper-elected leader

Andrew Audibert
Hi Phillip,

It depends on how you're running the application. If you're directly calling the java command, you can use the "-cp" argument to set the classpath. Something like

java -cp "conf/:/path/to/your/jar" testAll

Andrew

On Wednesday, August 22, 2018 at 2:06:39 AM UTC-7, wwwovbcom wrote:
Dear Andrew,

Thanks a lot for your valuable suggestions. I tried the second way, and it works well. 

I guess that means the client cannot find the configuration file: alluxio-site.propertperties. I tried to add the path to CLASSPATH in /etc/profile,and then source it. It seems that the client still cannot find the configuration file. Could you kindly tell me that how to add this file to the client's classpath? Thanks very much in advance.

Phillip





On Wednesday, 22 August 2018 11:34:41 UTC+8, Andrew Audibert wrote:
Hi,

For the alluxio-site.properties to be used by your client, it needs to be on the client's classpath. Adding the file to the classpath should fix the issue.

Another way to fix the issue is to add

Configuration.set(PropertyKey.ZOOKEEPER_ENABLED, "true");

to your java method.

Hope that helps,
Andrew



On Tue, Aug 21, 2018 at 8:25 PM wwwovbcom <[hidden email]> wrote:

I struggled with Alluxio 1.7 for months, but could not find a way to properly configure Java client following the instruction documents.

 

I tried to run the following client-side demo (on oss3):

public class testAll

{

        public static void main(String[] args)

        {

               // Configuration.set(PropertyKey.MASTER_HOSTNAME,"oss2");

Configuration.set(PropertyKey.ZOOKEEPER_ADDRESS,"oss2:2181,oss5:2181,oss3:2181");

FileSystem fs = FileSystem.Factory.get();

                String st = new String("/newfile2.txt");

AlluxioURI path = new AlluxioURI(st);

try{

FileOutStream out = fs.createFile(path);

out.write(80);

out.close();

                } catch(IOException|AlluxioException e){

System.out.println("Exceptions start from:\n");

e.printStackTrace();

                }

        }

}

 

Question: The Alluxio cluster is deployed as high-available mode, oss5 is the leader master elected by zookeeper, and oss2 is a candidate master. When I run the above demo on oss3, the following errors appear:

alluxio.exception.status.UnavailableException: Failed to connect to FileSystemMasterClient @ oss3/<a href="http://89.72.12.3:19998" rel="nofollow" target="_blank" onmousedown="this.href=&#39;http://www.google.com/url?q\x3dhttp%3A%2F%2F89.72.12.3%3A19998\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNHbuhm35TWqG_xdd7-DhtaOpNdqRg&#39;;return true;" onclick="this.href=&#39;http://www.google.com/url?q\x3dhttp%3A%2F%2F89.72.12.3%3A19998\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNHbuhm35TWqG_xdd7-DhtaOpNdqRg&#39;;return true;">89.72.12.3:19998 after 43 attempts

        at alluxio.AbstractClient.connect(AbstractClient.java:230)

        at alluxio.AbstractClient.retryRPC(AbstractClient.java:302)

        at alluxio.client.file.RetryHandlingFileSystemMasterClient.createFile(RetryHandlingFileSystemMasterClient.java:115)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:123)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:114)

        at testAll.main(testAll.java:22)

 

My question is: the client can only try to connect to local master, and as a result, it cannot find the master located in oss2.

 

Background: I set the worker’s ‘alluxio-site.properties’ as follows. Is there any other configuration that should be specified?

# Common properties

alluxio.home=/root/Alluxio/

alluxio.zookeeper.enabled=true

alluxio.zookeeper.address=oss2:2181,oss5:2181,oss3:2181

#Master properties

# Security properties

# Worker properties

alluxio.worker.memory.size=10GB

# User properties

alluxio.underfs.address=/home/nfs

\

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Andrew Audibert
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Re: How could my Java client connect to zookeeper-elected leader

wwwovbcom
Hi, Andrew,

thanks very much for your suggestion! The problem that plagued me for months has been solved. 

Phillip

On Thursday, 23 August 2018 00:39:20 UTC+8, [hidden email] wrote:
Hi Phillip,

It depends on how you're running the application. If you're directly calling the java command, you can use the "-cp" argument to set the classpath. Something like

java -cp "conf/:/path/to/your/jar" testAll

Andrew

On Wednesday, August 22, 2018 at 2:06:39 AM UTC-7, wwwovbcom wrote:
Dear Andrew,

Thanks a lot for your valuable suggestions. I tried the second way, and it works well. 

I guess that means the client cannot find the configuration file: alluxio-site.propertperties. I tried to add the path to CLASSPATH in /etc/profile,and then source it. It seems that the client still cannot find the configuration file. Could you kindly tell me that how to add this file to the client's classpath? Thanks very much in advance.

Phillip





On Wednesday, 22 August 2018 11:34:41 UTC+8, Andrew Audibert wrote:
Hi,

For the alluxio-site.properties to be used by your client, it needs to be on the client's classpath. Adding the file to the classpath should fix the issue.

Another way to fix the issue is to add

Configuration.set(PropertyKey.ZOOKEEPER_ENABLED, "true");

to your java method.

Hope that helps,
Andrew



On Tue, Aug 21, 2018 at 8:25 PM wwwovbcom <[hidden email]> wrote:

I struggled with Alluxio 1.7 for months, but could not find a way to properly configure Java client following the instruction documents.

 

I tried to run the following client-side demo (on oss3):

public class testAll

{

        public static void main(String[] args)

        {

               // Configuration.set(PropertyKey.MASTER_HOSTNAME,"oss2");

Configuration.set(PropertyKey.ZOOKEEPER_ADDRESS,"oss2:2181,oss5:2181,oss3:2181");

FileSystem fs = FileSystem.Factory.get();

                String st = new String("/newfile2.txt");

AlluxioURI path = new AlluxioURI(st);

try{

FileOutStream out = fs.createFile(path);

out.write(80);

out.close();

                } catch(IOException|AlluxioException e){

System.out.println("Exceptions start from:\n");

e.printStackTrace();

                }

        }

}

 

Question: The Alluxio cluster is deployed as high-available mode, oss5 is the leader master elected by zookeeper, and oss2 is a candidate master. When I run the above demo on oss3, the following errors appear:

alluxio.exception.status.UnavailableException: Failed to connect to FileSystemMasterClient @ oss3/<a href="http://89.72.12.3:19998" rel="nofollow" target="_blank" onmousedown="this.href=&#39;http://www.google.com/url?q\x3dhttp%3A%2F%2F89.72.12.3%3A19998\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNHbuhm35TWqG_xdd7-DhtaOpNdqRg&#39;;return true;" onclick="this.href=&#39;http://www.google.com/url?q\x3dhttp%3A%2F%2F89.72.12.3%3A19998\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNHbuhm35TWqG_xdd7-DhtaOpNdqRg&#39;;return true;">89.72.12.3:19998 after 43 attempts

        at alluxio.AbstractClient.connect(AbstractClient.java:230)

        at alluxio.AbstractClient.retryRPC(AbstractClient.java:302)

        at alluxio.client.file.RetryHandlingFileSystemMasterClient.createFile(RetryHandlingFileSystemMasterClient.java:115)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:123)

        at alluxio.client.file.BaseFileSystem.createFile(BaseFileSystem.java:114)

        at testAll.main(testAll.java:22)

 

My question is: the client can only try to connect to local master, and as a result, it cannot find the master located in oss2.

 

Background: I set the worker’s ‘alluxio-site.properties’ as follows. Is there any other configuration that should be specified?

# Common properties

alluxio.home=/root/Alluxio/

alluxio.zookeeper.enabled=true

alluxio.zookeeper.address=oss2:2181,oss5:2181,oss3:2181

#Master properties

# Security properties

# Worker properties

alluxio.worker.memory.size=10GB

# User properties

alluxio.underfs.address=/home/nfs

\

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Andrew Audibert
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