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Type: New Feature
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 4.1.7
Affects Version/s: None
Component/s: Replication, Testing Infrastructure
Labels:
None

Backwards Compatibility:
Fully Compatible
Sprint:
Repl 2018-12-03, Repl 2018-12-17
Confidence Status:
None
Work Order:
3

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name:
None
Goal Link:
None

Dumping lock manager will show idle transactions that are holding locks. It will be very helpful to also dump the sessions and their transaction participants to show the logical session id and transaction number that is holding the resources. ~~SERVER-37406~~ will keep that information in the locker. However, dumping the session catalog is able to print more information, like buffered transaction operations and has no performance impact on production system.

One solution is to implement a global function in C++ to dump session catalog. The concern is that it only works on live process and not on core dump. It runs on a live process so that other threads can also run to change the state as mentioned in ~~SERVER-28437~~. A better but harder solution is to examine the memory using GDB scripting, which avoids all those problems.

is related to

SERVER-38706 Hang analyzer complains about undefined _killRequested

Closed

SERVER-38757 Using abseil hash maps for stdx::unordered_map breaks GDB pretty printing

Closed

SERVER-42371 Use get_unique_ptr helper in GDB dump sessions command

Closed

SERVER-38823 Re-enable dumping of SessionCatalog in hang analyzer

Closed

SERVER-39969 Fix dumping of SessionCatalog in hang analyzer

Closed

related to

SERVER-28437 Hang analyzer GDB module mongo_lock.py should use a memory based mechanism to discover the locks

Closed

SERVER-38249 stdx::unordered_map should be implemented as absl::node_hash_map

Closed

SERVER-36727 Dump open transactions and currentOp info in hang analyzer

Closed

SERVER-37406 A stashed Locker should keep information about the owning transaction

Closed

SERVER-39245 Log "verbose" session information in hang analyzer for important transactions

Closed

(5 related to)

Assignee:: Will Schultz
Reporter:: Siyuan Zhou
Participants:: Githook User, Judah Schvimer, Siyuan Zhou, Will Schultz
Votes:: 0 Vote for this issue
Watchers:: 6 Start watching this issue

Created:: Nov 08 2018 11:50:17 PM UTC
Updated:: Oct 29 2023 10:26:41 PM UTC
Resolved:: Dec 11 2018 08:23:14 PM UTC
Confidence Status Last Update:: 16/Nov/18 3:38 PM

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