You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-user@hadoop.apache.org by Satyam Singh <sa...@ericsson.com> on 2014/08/28 09:00:50 UTC

replication factor in hdfs-site.xml

Hi Users,



I want behaviour for hadoop cluster for writing/reading in following 
replication cases:

1. replication=2 and in cluster (3 datatnodes+namenode) one datanode 
gets down.
2. replication=2 and in cluster (3 datatnodes+namenode) 2 datanode gets 
down.


BR,
Satyam

RE: replication factor in hdfs-site.xml

Posted by "Liu, Yi A" <yi...@intel.com>.

For 1#, since you still have 2 datanodes alive, and the replication is 2, writing  will success.  (Read will success)
For 2#, now you only have 1 datanode, and the replication is 2, then initial writing will success, but later sometime pipeline recovery will fail. 

Regards,
Yi Liu


-----Original Message-----
From: Satyam Singh [mailto:satyam.singh@ericsson.com] 
Sent: Thursday, August 28, 2014 3:01 PM
To: user@hadoop.apache.org
Subject: replication factor in hdfs-site.xml

Hi Users,



I want behaviour for hadoop cluster for writing/reading in following replication cases:

1. replication=2 and in cluster (3 datatnodes+namenode) one datanode gets down.
2. replication=2 and in cluster (3 datatnodes+namenode) 2 datanode gets down.


BR,
Satyam

RE: replication factor in hdfs-site.xml

Posted by "Liu, Yi A" <yi...@intel.com>.

For 1#, since you still have 2 datanodes alive, and the replication is 2, writing  will success.  (Read will success)
For 2#, now you only have 1 datanode, and the replication is 2, then initial writing will success, but later sometime pipeline recovery will fail. 

Regards,
Yi Liu


-----Original Message-----
From: Satyam Singh [mailto:satyam.singh@ericsson.com] 
Sent: Thursday, August 28, 2014 3:01 PM
To: user@hadoop.apache.org
Subject: replication factor in hdfs-site.xml

Hi Users,



I want behaviour for hadoop cluster for writing/reading in following replication cases:

1. replication=2 and in cluster (3 datatnodes+namenode) one datanode gets down.
2. replication=2 and in cluster (3 datatnodes+namenode) 2 datanode gets down.


BR,
Satyam

RE: replication factor in hdfs-site.xml

Posted by "Liu, Yi A" <yi...@intel.com>.

For 1#, since you still have 2 datanodes alive, and the replication is 2, writing  will success.  (Read will success)
For 2#, now you only have 1 datanode, and the replication is 2, then initial writing will success, but later sometime pipeline recovery will fail. 

Regards,
Yi Liu


-----Original Message-----
From: Satyam Singh [mailto:satyam.singh@ericsson.com] 
Sent: Thursday, August 28, 2014 3:01 PM
To: user@hadoop.apache.org
Subject: replication factor in hdfs-site.xml

Hi Users,



I want behaviour for hadoop cluster for writing/reading in following replication cases:

1. replication=2 and in cluster (3 datatnodes+namenode) one datanode gets down.
2. replication=2 and in cluster (3 datatnodes+namenode) 2 datanode gets down.


BR,
Satyam

RE: replication factor in hdfs-site.xml

Posted by "Liu, Yi A" <yi...@intel.com>.

For 1#, since you still have 2 datanodes alive, and the replication is 2, writing  will success.  (Read will success)
For 2#, now you only have 1 datanode, and the replication is 2, then initial writing will success, but later sometime pipeline recovery will fail. 

Regards,
Yi Liu


-----Original Message-----
From: Satyam Singh [mailto:satyam.singh@ericsson.com] 
Sent: Thursday, August 28, 2014 3:01 PM
To: user@hadoop.apache.org
Subject: replication factor in hdfs-site.xml

Hi Users,



I want behaviour for hadoop cluster for writing/reading in following replication cases:

1. replication=2 and in cluster (3 datatnodes+namenode) one datanode gets down.
2. replication=2 and in cluster (3 datatnodes+namenode) 2 datanode gets down.


BR,
Satyam