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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1712) Remove special characters from path names of metadata tables
Date Wed, 11 Sep 2013 22:31:52 GMT
Christopher Tubbs created ACCUMULO-1712:
-------------------------------------------

             Summary: Remove special characters from path names of metadata tables
                 Key: ACCUMULO-1712
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1712
             Project: Accumulo
          Issue Type: Improvement
            Reporter: Christopher Tubbs
             Fix For: 1.6.0


This is particularly problematic because of the quoting required to examine hdfs paths with
a "!" character in them. The root table ID and the metadata table ID should not use special
characters.

Some considerations:
# should not collide with possible user table IDs
# might be useful, but may not be necessary, to retain lexicographical sort order, so root
table goes first, then metadata table, then other tables

Some options:
# Use negative numbers: -1 for the root table, -2 for the metadata table (my personal favorite)
# Use a different special character: %, &, +, or . (each of which may have special considerations)
# Reserve a block of IDs for internal use (say, 0-10 or 0-100), and move other tables on upgrade


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