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raft: fix crash on election_timeout reconfig
Vladislav Shpilevoy authored 
It used to crash if done during election on a node voted for
anybody, it is a candidate, it doesn't know a leader yet, but has
a WAL write in progress.

Thus it could only happen if the term was bumped by a message from
a non-leader node and wasn't flushed to the disk yet.

The patch makes the reconfig check if there is a WAL write in
progress. Then don't do anything.

Could also check for volatile vote instead of persistent, but it
would create the same problem for the case when started writing
vote for self and didn't finish yet. Reconfig would crash.

(cherry picked from commit 82757e55)
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Tarantool

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Tarantool is an in-memory database and application server.

Key features of the application server:

  • 100% compatible drop-in replacement for Lua 5.1, based on LuaJIT 2.1. Simply use #!/usr/bin/tarantool instead of #!/usr/bin/lua in your script.
  • full support for Lua modules and a rich set of own modules, including cooperative multitasking, non-blocking I/O, access to external databases, etc

Key features of the database:

  • ANSI SQL, including views, joins, referential and check constraints
  • MsgPack data format and MsgPack based client-server protocol
  • two data engines: 100% in-memory with optional persistence and an own implementation of LSM-tree, to use with large data sets
  • multiple index types: HASH, TREE, RTREE, BITSET
  • asynchronous master-master replication
  • authentication and access control
  • the database is just a C extension to the application server and can be turned off

Supported platforms are Linux/x86, FreeBSD/x86 and OpenBSD/x86, Mac OS X.

Tarantool is ideal for data-enriched components of scalable Web architecture: queue servers, caches, stateful Web applications.

To download and install Tarantool as a binary package for your OS, please visit https://tarantool.io/en/download/.

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