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Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2011/06/12 16:15:05 UTC

[Hadoop Wiki] Update of "FAQ" by QwertyManiac

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The "FAQ" page has been changed by QwertyManiac:
http://wiki.apache.org/hadoop/FAQ?action=diff&rev1=99&rev2=100

  == Does the name-node stay in safe mode till all under-replicated files are fully replicated? ==
  No. During safe mode replication of blocks is prohibited.  The name-node awaits when all or majority of data-nodes report their blocks.
  
- Depending on how safe mode parameters are configured the name-node will stay in safe mode  until a specific percentage of blocks of the system is ''minimally'' replicated  [[http://hadoop.apache.org/core/docs/current/hadoop-default.html#dfs.replication.min|dfs.replication.min]]. If the safe mode threshold  [[http://hadoop.apache.org/core/docs/current/hadoop-default.html#dfs.safemode.threshold.pct|dfs.safemode.threshold.pct]]  is set to 1 then all blocks of all  files should be minimally replicated.
+ Depending on how safe mode parameters are configured the name-node will stay in safe mode  until a specific percentage of blocks of the system is ''minimally'' replicated  [[http://hadoop.apache.org/core/docs/current/hdfs-default.html#dfs.replication.min|dfs.replication.min]]. If the safe mode threshold  [[http://hadoop.apache.org/core/docs/current/hdfs-default.html#dfs.safemode.threshold.pct|dfs.safemode.threshold.pct]]  is set to 1 then all blocks of all  files should be minimally replicated.
  
  Minimal replication does not mean full replication. Some replicas may be missing and in  order to replicate them the name-node needs to leave safe mode.