Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
Hadoop >> mail # user >> Namenode corruption: need help quickly please


Copy link to this message
-
Re: Namenode corruption: need help quickly please

On Oct 25, 2010, at 5:30 PM, phil young wrote:
> We and others have seen the following error. Apparently it occurs when
> there's some change resulting in a difference in the "build" versions. This
> is not DFS corruption but may apper to be so because the master and task
> tracker processes start fine, but the
> DataNodes<https://twiki.tripadvisor.com/bin/edit/Development/DataNodes?topicparent=Development.HadoopTroubleshooting;nowysiwyg=0>report
> the following error:

It actually *can* lead to a "sort of" DFS corruption if the NN and DN versions are too far apart and a block conversion was required.  i.e., 0.21 vs 0.20 .  In that scenario, you can only roll forward, not back.  If you really wanted the older version, then you are a bit SOL, as there is no roll back without a snapshot being taken beforehand.
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB