Release 1.12.0

[neverchanje]

This is a feature release. The main target is to make backup-request available.

What we gonna have in 1.12.0:

Scripts:

• scripts: add clusters_show.sh; fix pack scripts; update rdsn #305
• *: Update installation.md & add an exit code in start_zk #324
• scripts: add clusters_stat.sh #301
• scripts: support minos 2.0 #298
• script: enforce rolling update to be run in tmux. #296

No code:

• Add issue & pull request templates #331
• docs: add ddd-diagnose.png for wiki #297
• doc: remove stale doc files and run.cmd XiaoMi/rdsn#260

Tiny fixes:

• log: reduce some rocksdb statistics log #326
• *:fix Semaphore bug & Compile warnings XiaoMi/rdsn#238
• replica: add unit tests for mutation log replay XiaoMi/rdsn#233
• utils: test format utilities XiaoMi/rdsn#231
• remote-cmd: make HANDLE_CLI_FLAGS a short line of macro XiaoMi/rdsn#229
• rpc: support sending rpc_holder through partition_resolver XiaoMi/rdsn#227

Shell & Tools(sample/bench/redisproxy) updates

• shell: JSON output supported for more commands #329
• shell: improve data scan commands to support MATCH_EXACT filter #303
• bugfix: fix memleak in sample and bench #312
• bugfix: fix redis proxy set ttl bug; fix unit test #302
• shell: command ls and nodes support output in json mode #290
• ddl_client: JSON output supported for list_app and cluster_info XiaoMi/rdsn#254
• utility: table_printer support output in json mode. XiaoMi/rdsn#223,

Backup Request:

• rpc: minor refactoring on thrift_messsage_parser XiaoMi/rdsn#251
• rpc: minor refactoring on message_reader XiaoMi/rdsn#252,

[Memory utilization optimization] support tcmalloc heap profiling:

• http: support tcmalloc heap profiler and growth profiler XiaoMi/rdsn#225

[qinzuoyan]

Backup Request会修改rpc request header的格式，存在兼容性问题，只升级小版本号恐怕不太合适，考虑升级到1.12.0？

[neverchanje]

@qinzuoyan OK

[neverchanje]

https://github.com/XiaoMi/pegasus/releases/tag/v1.12.0-RC1
https://github.com/XiaoMi/rdsn/releases/tag/v1.12.0-RC1