What's Changed

• Looking at the Chinese document, I found that the subtraction operation. by @zyh-future in https://github.com/apache/rocketmq/pull/3033
• [ISSUE #3006]Replace ScheduledExecutorService instead of Timer to avoid affecting other tasks during exception by @zhenhe in https://github.com/apache/rocketmq/pull/3001
• [ISSUE 3203] Replace the class 'StringBuffer' by 'StringBuilder' by @gorden5566 in https://github.com/apache/rocketmq/pull/3204
• [ISSUE #3215] polish litePullConsumer seek logic #3216 by @guyinyou in https://github.com/apache/rocketmq/pull/3283
• [ISSUE #3284]Optimizing benchmark code by @zhangjidi2016 in https://github.com/apache/rocketmq/pull/3285
• [ISSUE #3136] TraceDataEncoder add SubAfter trace bean timestamp by @StyleTang in https://github.com/apache/rocketmq/pull/3137
• [ISSUE #3284]Optimizing benchmark code by @keepal7 in https://github.com/apache/rocketmq/pull/3317
• [ISSUE #3194] [PART A] Use LongAdder instead of AtomicLong in BrokerStatsService to improve performance. by @areyouok in https://github.com/apache/rocketmq/pull/3195
• [ISSUE #3284]Optimize the buildMessage method by @zhangjidi2016 in https://github.com/apache/rocketmq/pull/3324
• [ISSUE #3333] Remove commons-codes dependency by @areyouok in https://github.com/apache/rocketmq/pull/3334
• [ISSUE #3339] (doc)fix typo in update operation.md by @WuHang1 in https://github.com/apache/rocketmq/pull/3339
• [ISSUS #3340] (doc)add hyperlink for client repos in the introduction. by @TrumanDu in https://github.com/apache/rocketmq/pull/3338
• [ISSUE #3326] fix send trace fail if broker set tls.server.mode=enforcing by @yuz10 in https://github.com/apache/rocketmq/pull/3325
• [ISSUE #2724] Resend message to DLQ directly when max reconsume times reach by @maixiaohai in https://github.com/apache/rocketmq/pull/3318
• [ISSUE #3296] Add get stats and single queue stats for schedule topic by @Git-Yang in https://github.com/apache/rocketmq/pull/3302
• [ISSUE #3314] Make mqClientApi request timeout settable by @lizhiboo in https://github.com/apache/rocketmq/pull/3313
• [ISSUE #3245] Use df algorithm to calculate the disk used ratio by @aaron-ai in https://github.com/apache/rocketmq/pull/3344
• [ISSUE #3346]Avoid double parse remoteAddr in rpcHook call by @WJL3333 in https://github.com/apache/rocketmq/pull/3345
• [ISSUE #3225]change Random to ThreadLocalRandom in broker by @lfz757077613 in https://github.com/apache/rocketmq/pull/3220
• [ISSUE #1848] Add write perm admin command by @coder-zzzz in https://github.com/apache/rocketmq/pull/1858
• [ISSUE #3281]fix fail to delete topic perm list and global white address(#3128) by @yuz10 in https://github.com/apache/rocketmq/pull/3280
• [ISSUE #3194] [PART C] Replace AtomicLong with LongAdder in StatsItem.java to improve performance by @areyouok in https://github.com/apache/rocketmq/pull/3351
• [ISSUE #2436] DLQ topic default perm change by @maixiaohai in https://github.com/apache/rocketmq/pull/2437
• [ISSUE #3361]DefaultMQProducer's constructor can call the overloaded constructor. by @zhangjidi2016 in https://github.com/apache/rocketmq/pull/3362
• [ISSUE #2726] retrying by customizing response code by @wz2cool in https://github.com/apache/rocketmq/pull/2729
• [ISSUE #2964] Add a query consumer config command in mqadmin. by @zhangjidi2016 in https://github.com/apache/rocketmq/pull/2965
• [ISSUE #XXXX] Update rocketmq client maven version by @zhouwentong1993 in https://github.com/apache/rocketmq/pull/3335
• [ISSUE #3347] Improve performance of expandIP, and readable by @844392610 in https://github.com/apache/rocketmq/pull/3322
• [ISSUE #3308] production level pull api demo by @lwclover in https://github.com/apache/rocketmq/pull/3295
• Update RocketMQ_Example.md by @Silverados in https://github.com/apache/rocketmq/pull/3303
• Update Example_Batch.md by @Silverados in https://github.com/apache/rocketmq/pull/3304
• [ISSUE #1869] Delay message can't be consumed when delay offset in delayOffset.json is wrong by @RongtongJin in https://github.com/apache/rocketmq/pull/3358
• RIP-7 Multiple Directories Storage Support by @Jason918 in https://github.com/apache/rocketmq/pull/3357
• [ISSUE #3379] Fix formatting errors by @Git-Yang in https://github.com/apache/rocketmq/pull/3380
• [ISSUE #3375] Lazy init GetMessageResult only when find message. by @WJL3333 in https://github.com/apache/rocketmq/pull/3374
• [ISSUE #2667] Repair 'file doesn't exist on this path' by @Git-Yang in https://github.com/apache/rocketmq/pull/3278
• [ISSUE #503] NOT_CONSUME_YET not right in RocketMQ Console by @sunbufu in https://github.com/apache/rocketmq/pull/3091
• [ISSUE #3384] Add SendBack message to SCHEDULE_TOPIC_XXXX stats by @Git-Yang in https://github.com/apache/rocketmq/pull/3385
• [ISSUE #3288] Fix producer always timeouts while sending first message by @Loyilee in https://github.com/apache/rocketmq/pull/3383
• [ISSUE #2962] Implement DefaultMQAdminExt::examineTopicConfig function by @Aaron-He in https://github.com/apache/rocketmq/pull/3039
• Fix wrong comment by @MingJunDuan in https://github.com/apache/rocketmq/pull/3400
• [ISSUE #3148]Support metadata export by @panzhi33 in https://github.com/apache/rocketmq/pull/3149
• [ISSUE #3415] Fix the problem of failure during checkstyle execution by @Git-Yang in https://github.com/apache/rocketmq/pull/3416

New Contributors

• @zyh-future made their first contribution in https://github.com/apache/rocketmq/pull/3033
• @zhenhe made their first contribution in https://github.com/apache/rocketmq/pull/3001
• @StyleTang made their first contribution in https://github.com/apache/rocketmq/pull/3137
• @keepal7 made their first contribution in https://github.com/apache/rocketmq/pull/3317
• @WuHang1 made their first contribution in https://github.com/apache/rocketmq/pull/3339
• @TrumanDu made their first contribution in https://github.com/apache/rocketmq/pull/3338
• @aaron-ai made their first contribution in https://github.com/apache/rocketmq/pull/3344
• @WJL3333 made their first contribution in https://github.com/apache/rocketmq/pull/3345
• @wz2cool made their first contribution in https://github.com/apache/rocketmq/pull/2729
• @zhouwentong1993 made their first contribution in https://github.com/apache/rocketmq/pull/3335
• @844392610 made their first contribution in https://github.com/apache/rocketmq/pull/3322
• @Silverados made their first contribution in https://github.com/apache/rocketmq/pull/3303
• @Loyilee made their first contribution in https://github.com/apache/rocketmq/pull/3383
• @MingJunDuan made their first contribution in https://github.com/apache/rocketmq/pull/3400

Full Changelog: https://github.com/apache/rocketmq/compare/rocketmq-all-4.9.1...rocketmq-all-4.9.2