Create purge locality utility
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Key: ACCUMULO-483
URL: https://issues.apache.org/jira/browse/ACCUMULO-483
Project: Accumulo
Issue Type: New Feature
Components: client
Reporter: John Vines
Assignee: Billie Rinaldi
Priority: Minor
Fix For: 1.4.1
For some high capacity ingest, the desired path is to do some pre-splits, bulk
import, and then let it naturally split down the rest of the way. If all of the
pre-split tablets made split evenly, then the system will have continuous
ranges bundled together on tservers. This poor distribution can impact
performance depending on the operations performed. This could be handled in the
load balancer, but it could be tricky. You don't want to randomly reassign
tablets with any sort of frequency. Rather, you want to do a one-time operation
in doing so. Given the initial assignment code is a bit random (needs to be
validated), this could easily be done by offlining a table, purging all
location records for it from the !METADATA table, and bringing it back online.
The balancer will assign the table randomly, at which point the user could
force a major compaction to restablish locality (as well some permanence in
tablet assignment).
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