Added replicated log reader catch-up section to the upgrades doc.

Review: https://reviews.apache.org/r/64923/


Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/34d92d8b
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/34d92d8b
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/34d92d8b

Branch: refs/heads/master
Commit: 34d92d8b3495c1ea871b4993eb174bb94f1c31ef
Parents: 925afdc
Author: Ilya Pronin <ipro...@twopensource.com>
Authored: Fri Apr 13 15:04:46 2018 -0700
Committer: Jie Yu <yujie....@gmail.com>
Committed: Fri Apr 13 15:04:53 2018 -0700

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 docs/upgrades.md | 4 ++++
 1 file changed, 4 insertions(+)
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http://git-wip-us.apache.org/repos/asf/mesos/blob/34d92d8b/docs/upgrades.md
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diff --git a/docs/upgrades.md b/docs/upgrades.md
index 6bef371..2de8900 100644
--- a/docs/upgrades.md
+++ b/docs/upgrades.md
@@ -408,6 +408,10 @@ We categorize the changes as follows:
 
 * Protobuf version 3+ is required to build Mesos. Please upgrade your Protobuf 
library if you are using an unbundled one.
 
+<a name="1-5-x-log-reader-catchup"></a>
+
+* A new `catchup()` method has been added to the replicated log reader API. 
The method allows to catch-up positions missing in the local non-leading 
replica to allow safe eventually consistent reads from it. Note about backwards 
compatibility: In order for the feature to work correctly in presence of log 
truncations all log replicas need to be updated.
+
 ## Upgrading from 1.3.x to 1.4.x ##
 
 <a name="1-4-x-ambient-capabilities"></a>

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