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Sanjay Radia commented on HADOOP-7967: -------------------------------------- Daryn, rather than do this in two or three steps, let us do a single patch to address this problem completely. I have summarized our discussion in MAPREDUCE-3825 in this [comment.|https://issues.apache.org/jira/browse/MAPREDUCE-3825?focusedCommentId=13398726&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13398726] > Need generalized multi-token filesystem support > ----------------------------------------------- > > Key: HADOOP-7967 > URL: https://issues.apache.org/jira/browse/HADOOP-7967 > Project: Hadoop Common > Issue Type: Bug > Components: fs, security > Affects Versions: 0.23.1, 0.24.0 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Attachments: HADOOP-7967-2.patch, HADOOP-7967-3.patch, > HADOOP-7967-4.patch, HADOOP-7967-compat.patch, HADOOP-7967.patch > > > Multi-token filesystem support and its interactions with the MR > {{TokenCache}} is problematic. The {{TokenCache}} tries to assume it has the > knowledge to know if the tokens for a filesystem are available, which it > can't possibly know for multi-token filesystems. Filtered filesystems are > also problematic, such as har on viewfs. When mergeFs is implemented, it too > will become a problem with the current implementation. Currently > {{FileSystem}} will leak tokens even when some tokens are already present. > The decision for token acquisition, and which tokens, should be pushed all > the way down into the {{FileSystem}} level. The {{TokenCache}} should be > ignorant and simply request tokens from each {{FileSystem}}. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira