dfs block ids sometimes collide
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Key: HADOOP-158
URL: http://issues.apache.org/jira/browse/HADOOP-158
Project: Hadoop
Type: Bug
Components: dfs
Reporter: Doug Cutting
Fix For: 0.2
A random number generator is used to allocate block ids in dfs. Sometimes a
block id is allocated that is already used in the filesystem, which causes
filesystem corruption.
A short-term fix for this is to simply check when allocating block ids whether
any file is already using the newly allocated id, and, if it is, generate
another one. There can still be collisions in some rare conditions, but these
are harder to fix and will wait, since this simple fix will handle the vast
majority of collisions.
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