Re: Blocks replication in downtime even
Hi What happens when the node rejoins then ? - The replication level of several blocks increases ? - The old replicas are removed in favor of new replicas ? (Or the new ones) regards Piotr 2009/4/27 Stas Oskin stas.os...@gmail.com Thanks. 2009/4/27 Koji Noguchi knogu...@yahoo-inc.com http://hadoop.apache.org/core/docs/current/hdfs_design.html#Data+Disk+Fa ilure%2C+Heartbeats+and+Re-Replication http://hadoop.apache.org/core/docs/current/hdfs_design.html#Data+Disk+Fa%0Ailure%2C+Heartbeats+and+Re-Replication hope this helps. Koji -Original Message- From: Stas Oskin [mailto:stas.os...@gmail.com] Sent: Monday, April 27, 2009 4:11 AM To: core-user@hadoop.apache.org Subject: Blocks replication in downtime even Hi. I have a question: If I have N of DataNodes, and one or several of the nodes have become unavailable, would HDFS re-synchronize the blocks automatically, according to replication level set? And if yes, when? As soon as the offline node was detected, or only on file access? Regards.
Re: Blocks replication in downtime even
Hi. I think one needs to run balancer in order to clean out the redundant blocks. Can anyone confirm this? Regards. 2009/4/28 Piotr piotr.prac...@gmail.com Hi What happens when the node rejoins then ? - The replication level of several blocks increases ? - The old replicas are removed in favor of new replicas ? (Or the new ones) regards Piotr 2009/4/27 Stas Oskin stas.os...@gmail.com Thanks. 2009/4/27 Koji Noguchi knogu...@yahoo-inc.com http://hadoop.apache.org/core/docs/current/hdfs_design.html#Data+Disk+Fa ilure%2C+Heartbeats+and+Re-Replication http://hadoop.apache.org/core/docs/current/hdfs_design.html#Data+Disk+Fa%0Ailure%2C+Heartbeats+and+Re-Replication hope this helps. Koji -Original Message- From: Stas Oskin [mailto:stas.os...@gmail.com] Sent: Monday, April 27, 2009 4:11 AM To: core-user@hadoop.apache.org Subject: Blocks replication in downtime even Hi. I have a question: If I have N of DataNodes, and one or several of the nodes have become unavailable, would HDFS re-synchronize the blocks automatically, according to replication level set? And if yes, when? As soon as the offline node was detected, or only on file access? Regards.
RE: Blocks replication in downtime even
http://hadoop.apache.org/core/docs/current/hdfs_design.html#Data+Disk+Fa ilure%2C+Heartbeats+and+Re-Replication hope this helps. Koji -Original Message- From: Stas Oskin [mailto:stas.os...@gmail.com] Sent: Monday, April 27, 2009 4:11 AM To: core-user@hadoop.apache.org Subject: Blocks replication in downtime even Hi. I have a question: If I have N of DataNodes, and one or several of the nodes have become unavailable, would HDFS re-synchronize the blocks automatically, according to replication level set? And if yes, when? As soon as the offline node was detected, or only on file access? Regards.
Re: Blocks replication in downtime even
Thanks. 2009/4/27 Koji Noguchi knogu...@yahoo-inc.com http://hadoop.apache.org/core/docs/current/hdfs_design.html#Data+Disk+Fa ilure%2C+Heartbeats+and+Re-Replicationhttp://hadoop.apache.org/core/docs/current/hdfs_design.html#Data+Disk+Fa%0Ailure%2C+Heartbeats+and+Re-Replication hope this helps. Koji -Original Message- From: Stas Oskin [mailto:stas.os...@gmail.com] Sent: Monday, April 27, 2009 4:11 AM To: core-user@hadoop.apache.org Subject: Blocks replication in downtime even Hi. I have a question: If I have N of DataNodes, and one or several of the nodes have become unavailable, would HDFS re-synchronize the blocks automatically, according to replication level set? And if yes, when? As soon as the offline node was detected, or only on file access? Regards.
