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RATIS-1898. Netty should use EpollEventLoopGroup by default#931

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szetszwo merged 4 commits intoapache:masterfrom
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Oct 4, 2023
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RATIS-1898. Netty should use EpollEventLoopGroup by default#931
szetszwo merged 4 commits intoapache:masterfrom
ivandika3:RATIS-1898

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@ivandika3 ivandika3 commented Oct 4, 2023 •
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What changes were proposed in this pull request?

From Netty documentation (https://netty.io/wiki/native-transports.html), EpollEventLoopGroup generally should have better performance than NioEventLoopGroup and therefore should be used by default. The only reason to use NioEventLoopGroup is if the underlying OS does not support it (EpollEventLoopGroup is only supported in Linux).

From the one of the core developer of Netty (Norman Maurer): https://stackoverflow.com/questions/35568365/netty-epolleventloopgroup-vs-nioeventloopgroup-which-should-i-choose-on-centos

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/RATIS-1898

How was this patch tested?

Existing tests (NioEventLoopGroup to EpollEventLoopGroup should not introduce regressions).

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ivandika3 commented Oct 4, 2023 •
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@szetszwo @guohao-rosicky Could you help take a look if you have time?

@guohao-rosicky It seems that the epoll configuration is introduced on RATIS-1521. Do you use it in your cluster, and if so, are there any performance benefits compared to using the NioEventLoopGroup? Also in the NettyClientStreamRpc it seems that epoll is never used (in RATIS-1549), do you know why is this so?

@ivandika3 ivandika3 changed the title RATIS-1898. Netty to use EpollEventLoopGroup by default RATIS-1898. Netty should use EpollEventLoopGroup by default Oct 4, 2023
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szetszwo approved these changes Oct 4, 2023
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@ivandika3 , thanks a lot for working on this!

+1 the change looks good.

@szetszwo szetszwo merged commit 317bed0 into apache:master Oct 4, 2023
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ivandika3 commented Oct 5, 2023

Thank you for the review @szetszwo.

symious pushed a commit to symious/ratis that referenced this pull request Mar 25, 2024
@ivandika3 @symious
RATIS-1898. Netty should use EpollEventLoopGroup by default (apache#931)
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@SteNicholas SteNicholas mentioned this pull request Apr 24, 2024
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@ivandika3 ivandika3 deleted the RATIS-1898 branch May 29, 2024 01:55
RexXiong pushed a commit to apache/celeborn that referenced this pull request May 30, 2024
@SteNicholas @RexXiong
[CELEBORN-1400] Bump Ratis version from 2.5.1 to 3.0.1
2a57fab 
### What changes were proposed in this pull request?

Bump Ratis version from 2.5.1 to 3.0.1. Address incompatible changes:

- RATIS-589. Eliminate buffer copying in SegmentedRaftLogOutputStream.(apache/ratis#964)
- RATIS-1677. Do not auto format RaftStorage in RECOVER.(apache/ratis#718)
- RATIS-1710. Refactor metrics api and implementation to separated modules. (apache/ratis#749)

### Why are the changes needed?

Bump Ratis version from 2.5.1 to 3.0.1. Ratis has released v3.0.0, v3.0.1, which release note refers to [3.0.0](https://ratis.apache.org/post/3.0.0.html), [3.0.1](https://ratis.apache.org/post/3.0.1.html). The 3.0.x version include new features like pluggable metrics and lease read, etc, some improvements and bugfixes including:

- 3.0.0: Change list of ratis 3.0.0 In total, there are roughly 100 commits diffing from 2.5.1 including:
   - Incompatible Changes
      - RaftStorage Auto-Format
      - RATIS-1677. Do not auto format RaftStorage in RECOVER. (apache/ratis#718)
      - RATIS-1694. Fix the compatibility issue of RATIS-1677. (apache/ratis#731)
      - RATIS-1871. Auto format RaftStorage when there is only one directory configured. (apache/ratis#903)
      - Pluggable Ratis-Metrics (RATIS-1688)
      - RATIS-1689. Remove the use of the thirdparty Gauge. (apache/ratis#728)
      - RATIS-1692. Remove the use of the thirdparty Counter. (apache/ratis#732)
      - RATIS-1693. Remove the use of the thirdparty Timer. (apache/ratis#734)
      - RATIS-1703. Move MetricsReporting and JvmMetrics to impl. (apache/ratis#741)
      - RATIS-1704. Fix SuppressWarnings(“VisibilityModifier”) in RatisMetrics. (apache/ratis#742)
      - RATIS-1710. Refactor metrics api and implementation to separated modules. (apache/ratis#749)
      - RATIS-1712. Add a dropwizard 3 implementation of ratis-metrics-api. (apache/ratis#751)
      - RATIS-1391. Update library dropwizard.metrics version to 4.x (apache/ratis#632)
      - RATIS-1601. Use the shaded dropwizard metrics and remove the dependency (apache/ratis#671)
      - Streaming Protocol Change
      - RATIS-1569. Move the asyncRpcApi.sendForward(..) call to the client side. (apache/ratis#635)
   - New Features
      - Leader Lease (RATIS-1864)
      - RATIS-1865. Add leader lease bound ratio configuration (apache/ratis#897)
      - RATIS-1866. Maintain leader lease after AppendEntries (apache/ratis#898)
      - RATIS-1894. Implement ReadOnly based on leader lease (apache/ratis#925)
      - RATIS-1882. Support read-after-write consistency (apache/ratis#913)
      - StateMachine API
      - RATIS-1874. Add notifyLeaderReady function in IStateMachine (apache/ratis#906)
      - RATIS-1897. Make TransactionContext available in DataApi.write(..). (apache/ratis#930)
      - New Configuration Properties
      - RATIS-1862. Add the parameter whether to take Snapshot when stopping to adapt to different services (apache/ratis#896)
      - RATIS-1930. Add a conf for enable/disable majority-add. (apache/ratis#961)
      - RATIS-1918. Introduces parameters that separately control the shutdown of RaftServerProxy by JVMPauseMonitor. (apache/ratis#950)
      - RATIS-1636. Support re-config ratis properties (apache/ratis#800)
      - RATIS-1860. Add ratis-shell cmd to generate a new raft-meta.conf. (apache/ratis#901)
   - Improvements & Bug Fixes
      - Netty
         - RATIS-1898. Netty should use EpollEventLoopGroup by default (apache/ratis#931)
         - RATIS-1899. Use EpollEventLoopGroup for Netty Proxies (apache/ratis#932)
         - RATIS-1921. Shared worker group in WorkerGroupGetter should be closed. (apache/ratis#955)
         - RATIS-1923. Netty: atomic operations require side-effect-free functions. (apache/ratis#956)
      - RaftServer
         - RATIS-1924. Increase the default of raft.server.log.segment.size.max. (apache/ratis#957)
         - RATIS-1892. Unify the lifetime of the RaftServerProxy thread pool (apache/ratis#923)
         - RATIS-1889. NoSuchMethodError: RaftServerMetricsImpl.addNumPendingRequestsGauge apache/ratis#922 (apache/ratis#922)
         - RATIS-761. Handle writeStateMachineData failure in leader. (apache/ratis#927)
         - RATIS-1902. The snapshot index is set incorrectly in InstallSnapshotReplyProto. (apache/ratis#933)
         - RATIS-1912. Fix infinity election when perform membership change. (apache/ratis#954)
         - RATIS-1858. Follower keeps logging first election timeout. (apache/ratis#894)

- 3.0.1:This is a bugfix release. See the [changes between 3.0.0 and 3.0.1](apache/ratis@ratis-3.0.0...ratis-3.0.1) releases.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Cluster manual test.

Closes #2480 from SteNicholas/CELEBORN-1400.

Authored-by: SteNicholas <programgeek@163.com>
Signed-off-by: Shuang <lvshuang.xjs@alibaba-inc.com>
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