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[Bug] PD task REST: balanceLeaders throws a bare HTTP 500 during the balance-shard window, and task responses cannot be told apart from a no-op or a follower answer

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难度
2/5
预计耗时
1-3 小时
新手友好度
70/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
java
领域
api, backend

调研方向

错误位于 TaskAPI.java 第 92-95 行,其中 balanceLeaders 抛出 PDException 时没有处理器。请与同级端点(如 patrolPartitions)进行比较,后者会捕获异常并返回 toJSON(e)。同时检查 TaskScheduleService.java:478 以获取错误信息。修复后,请测试 REST 端点 /v1/task/balanceLeaders 和 /v1/task/patrolPartitions,确保它们返回正确的 JSON 而不是裸的 500 错误。

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描述

Bug Type (问题类型)

rest-api (结果不合预期)

Before submit
  • I have confirmed and searched that there are no similar problems in the historical issue and documents
Environment (环境信息)
  • Server Version: master 83ef9f3 (pd image sha256:69dc1d4e8625)
  • Backend: HStore, 3 PD + 3 Store, 12 shard groups
  • OS: kind v0.33 (Kubernetes 1.37.0)
Expected & Actual behavior (期望与实际表现)

Measured 2026-09-22 while executing the documented recovery sequence (patrolPartitions, balanceLeaders, balancePartitions) on the PD leader with a follower as control:

  1. GET /v1/task/balanceLeaders within 180 s of a balancePartitions call (which sets the balance-shard key even when it moves nothing) answers {"timestamp":...,"status":500,"error":"Internal Server Error","path":"/v1/task/balanceLeaders"} with no reason. The reason (PDException: balance shard is processing, please try later!, TaskScheduleService.java:478) appears only in the PD log. Cause: TaskAPI.balanceLeaders (TaskAPI.java:92-95) declares throws PDException with no handler, while its siblings catch and return toJSON(e). One-line fix.
  2. GET /v1/task/patrolPartitions returns the byte-identical body {"status": 0,"partitions": [ ]} on the leader and on a follower, whether or not it repaired anything; a follower does no work and reports success. balancePartitions differs by two bytes ({} from the leader, empty body from a follower). Operators driving recovery over REST cannot tell "ran and repaired", "ran, nothing to do" and "hit a follower, did nothing" apart without reading PD logs.

Ask: catch the PDException in balanceLeaders like the sibling endpoints; and have the task endpoints either redirect to the leader (as the read APIs do via getMembers) or answer an explicit error naming the leader, plus include what was done (groups reallocated, leaders moved, partitions moved) in the body.

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