Github user keith-turner commented on the pull request:
https://github.com/apache/accumulo/pull/96#issuecomment-215454359
An alternative solution to introducing `SyncingTabletLocator` could be to
change the implementation of clearLocators to the following. This clears all
of the caches while still maintaining the references to in uses locators.
```java
public static synchronized void clearLocators() {
for(TabletLocator tl : locators.values()){
tl.invalidateCache();
}
}
```
If worried about empty tablet location caches being left around in the
`locators` map, that could possible be changed to a weak hash map.
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