Set TabletGroupWatcher scan threads with tablet locs and config #3545
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Added a new property so that users can set a maximum number of scan threads to use in each TabletGroupWatcher thread in the Manager. The number of threads will be the minimum of the number of tablets in the table or the value of the new property. Fixes apache#3471
server/base/src/main/java/org/apache/accumulo/server/manager/state/TabletManagementScanner.java
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server/base/src/main/java/org/apache/accumulo/server/manager/state/TabletManagementScanner.java
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Added a new property so that users can set a maximum number of scan threads to use in each TabletGroupWatcher thread in the Manager. The number of threads will be the minimum of the number of tablets in the table or the value of the new property.
Fixes #3471