improve observability over exceptions#1730
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| if (leaf_exists) | ||
| ops.emplace_back(zkutil::makeSetRequest(last_exception_path, entry.toJsonString(), -1)); | ||
| else | ||
| { | ||
| LOG_INFO(log, "ExportPartition: Exceptions per replica path does not exist, will create it"); | ||
| ops.emplace_back(zkutil::makeCreateRequest(exceptions_per_replica_path, "", zkutil::CreateMode::Persistent)); | ||
| ops.emplace_back(zkutil::makeCreateRequest(count_path, "1", zkutil::CreateMode::Persistent)); | ||
| ops.emplace_back(zkutil::makeCreateRequest(last_exception_path, "", zkutil::CreateMode::Persistent)); | ||
| ops.emplace_back(zkutil::makeCreateRequest(last_exception_path / "part", part_name, zkutil::CreateMode::Persistent)); | ||
| ops.emplace_back(zkutil::makeCreateRequest(last_exception_path / "exception", exception_message, zkutil::CreateMode::Persistent)); | ||
| } | ||
| ops.emplace_back(zkutil::makeCreateRequest(last_exception_path, entry.toJsonString(), zkutil::CreateMode::Persistent)); |
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For exports that were created before this change, ZooKeeper contains .../exceptions_per_replica but not .../last_exception. In that upgrade scenario, this branch issues Create(.../last_exception/<replica>) without creating the parent path first, so Keeper returns ZNONODE and the surrounding tryMulti fails atomically. Because appendExceptionOps is used inside failure-handling multis (part failure bookkeeping, commit failure retries, and timeout-to-KILLED), those state transitions can be skipped repeatedly for in-flight legacy tasks, leaving them stuck in PENDING during failures.
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Observability over exceptions on export partition operations was broken and not reliable. This PR simplifies it by making it a single JSON array instead of multiple paths in zookeeper. Another change is that now
system.replicated_partition_exportsreturns only local information, it does not reach zookeeper.Documentation entry for user-facing changes
...
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