tree ac9ed66c2df4696c475f921667f05f81e60fc2f8
parent def0f5e222689824190552a8a2d630a4b97b2b83
author Antonio Barone <syntonyze@gmail.com> 1616530418 +0100
committer Luca Milanesio <luca.milanesio@gmail.com> 1617238576 +0000

Honour index retries when indexing groups

Similarly to the ForwardedIndexChangeHandler, the
ForwardedGroupChangeHandler will attempt multiple reindexes up to
`index.maxTries`, every `index.retryInterval` milliseconds.

To be able to understand whether replication is completed and the local
group ref is up-to-date, two main changes have been introduced:

- A GroupChecker class, with the responsibility to lookup in All-Users
  for the status of a specified group
- An extra field in the GroupIndexEvent class, to indicate which
  particular sha1 the ref group was updated to, so that GroupChecker
  could perform a specific lookup.

Note that to maintain backward-compatibility with previous
GroupIndexEvent's, the additional field was made optional, so that old
events can still be de-serialized and consumed by this version of the
multi-site code.

Bug: Issue 14161
Change-Id: Ifc171a49a0c360ceb39538a6d133154fcd0050e9