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The following page has been changed by TorstenCurdt: http://wiki.apache.org/lucene-hadoop/Hadoop_Upgrade ------------------------------------------------------------------------------ 1. Stop map-reduce cluster(s) [[BR]] {{{bin/stop-mapred.sh}}} [[BR]] and all client applications running on the DFS cluster. 2. Run {{{fsck}}} command: [[BR]] {{{bin/hadoop fsck / -files âblocks âlocations > dfs-v-old-fsck-1.log}}} [[BR]] Fix DFS to the point there are no errors. The resulting file will contain complete block map of the file system. [[BR]] Note. Redirecting the {{{fsck}}} output is recommend for large clusters in order to avoid time consuming output to stdout. 3. Run {{{lsr}}} command: [[BR]] {{{bin/hadoop dfs -lsr / > dfs-v-old-lsr-1.log}}} [[BR]] The resulting file will contain complete namespace of the file system. - 4. Run {{{report}}} command to create a list of data nodes participating in the cluster. [[BR]] {{{bin/hadoop dfs -report > dfs-v-old-report-1.log}}} + 4. Run {{{report}}} command to create a list of data nodes participating in the cluster. [[BR]] {{{bin/hadoop dfsadmin -report > dfs-v-old-report-1.log}}} 5. Optionally, copy all or unrecoverable only data stored in DFS to a local file system or a backup instance of DFS. 6. Optionally, stop and restart DFS cluster, in order to create an up-to-date namespace checkpoint of the old version. [[BR]] {{{bin/stop-dfs.sh}}} [[BR]] {{{bin/start-dfs.sh}}} 7. Optionally, repeat 3, 4, 5, and compare the results with the previous run to ensure the state of the file system remained unchanged.
