runzhiwang

RATIS-1273. Fix split brain by leader lease

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## What changes were proposed in this pull request? **What's the problem ?** For example, there are 3 servers: s1, s2, s3, and s1 is leader. When split-brain happens, s2...

RATIS-1291. Send heartbeat when there is no reply

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## What changes were proposed in this pull request? Currently, when there always exist log, leader only send log, and will not send heartbeat. The problem is if follower need...

[LIVY-721][SERVER] Distributed session id generation

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## What changes were proposed in this pull request? 1. When generate unique session id with multiple-active HA mode. First, get the distributed lock, Second, get the session id from...

[LIVY-336][SERVER] Livy should not spawn one thread per job to track the job on Yarn

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## What changes were proposed in this pull request? Instead of spawning a monitor thread for every session, create a centralized thread to monitor all apps. ## How was this...

[LIVY-628][LIVY-629][LIVY-630][THRIFT][WIP]: Support getDelegationToken, cancelDelegationToken, renewDelegationToken

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## What changes were proposed in this pull request? Support renewDelegationToken, getDelegationToken, cancelDelegationToken ## How was this patch tested? we will test it in the near future.

HDDS-4239. [Design] Ozone support truncate operation

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## What changes were proposed in this pull request? This is a design doc, which is moved from google doc to make it easier to track the progress. ## What...