ivankelly opened a new pull request #1575: Make each ensemble in ensemble list immutable URL: https://github.com/apache/bookkeeper/pull/1575 Previously, the ensemble list was a Map<Long, ArrayList<BookieSocketAddress>>. ArrayList is by definition mutable, so ensemble passed to metadata users are always mutable. This patch changes in ensembles in the list to be immutable. We were also leaking the implementation of ledger metadata to the placement policy, so this has been modified to use List<BookieSocketAddress> also. Master issue: #281
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