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mon: Add force-remove-snap mon command#53545

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Matan-B wants to merge 3 commits intoceph:mainfrom
Matan-B:wip-matanb-reremove-snap-only
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mon: Add force-remove-snap mon command#53545
Matan-B wants to merge 3 commits intoceph:mainfrom
Matan-B:wip-matanb-reremove-snap-only

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@Matan-B Matan-B commented Sep 20, 2023

    /*
     *  Forces removal of snapshots in the range of
     *  [lower_snapid_bound, upper_snapid_bound) on pool <pool>
     *  in order to cause OSDs to re-trim them.
     *  The command has two mutually exclusive variants:
     *  * Default: All the snapids in the given range which are not
     *    marked as purged in the Monitor will be removed. Mostly useful
     *    for cases in which the snapid is leaked in the client side.
     *    See: https://tracker.ceph.com/issues/64646
     *  * (Experimental) purged-snaps-only: Adding this flag will result
     *    in the reremoval of snapids in the given range.
     *    Only the snapids which are *already* marked as purged in the
     *    Monitor will be removed again. This may be useful for cases in
     *    which we would like to trigger OSD snap trimming again.
     */

Variant 1 (Default):

Remove all snapids in the range which are not marked as purged.

Useful for leaks such as: https://tracker.ceph.com/issues/64646

Example usage:

POOL_NAME         USED  OBJECTS  CLONES  COPIES
unique_pool_0    8 KiB        2       1       2

$ rados lssnap -p unique_pool_0
0 snaps

$ ceph osd pool force-remove-snap unique_pool_0 
force reremoving snap ids in the range of [1,2) from pool 2. reremoved snapids: 1

POOL_NAME         USED  OBJECTS  CLONES  COPIES
unique_pool_0    4 KiB        1       0       1 

Case 2 - purged-snaps-only:

Reremove snap ids in the range which are already marked as purged.


Notes:

  • `scrub_purged_snaps` can also be used to cause the OSD to re-trim
    purged snapshots. However, those will only get re-trimmed if they were
    marked as purged (PSN_ keys) in the OSD store.
    Using the command introduced here, the snapshots that were marked as
    purged (purged_snaps_ keys) in the mon's store will be also marked,
    correspondingly, in the OSD store.
    That way `scrub_purged_snaps` will be able to re-trim the snapshots that weren't
    marked as purged in the OSD side (for some reason).
    
  • The re-removed snapshots will be inserted to new_purged_snaps which
    will be used when handling the new MOSDMap. These new_purged_snaps
    are passed to SnapMapper::record_purged_snaps to be added to the OSD store.
    

Initial testing looks to be stable:

2023-09-19T14:33:10.222 INFO:teuthology.orchestra.run.smithi084.stderr:force reremoving snap ids in the range of [1,16) from pool 3. reremoved snapids: 2,3,6,8,14
2023-09-19T14:36:28.131 INFO:teuthology.orchestra.run.smithi084.stderr:force reremoving snap ids in the range of [1,206) from pool 3. reremoved snapids: 2,3,4,6,7,8,9,11,46,47,49,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,94,95,96,97,98,99,100,101,102,103,104,105,106,107,109,110,111,112,128,129,130,131,132,133,146,147,148,149,150,151,152,153,154,155,156,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,189,192,193,195,196,197,199,200,201,205
2023-09-19T14:36:42.319 INFO:teuthology.orchestra.run.smithi084.stderr:force reremoving snap ids in the range of [1,220) from pool 3. reremoved snapids: 2,3,4,6,7,8,9,11,46,47,49,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,94,95,96,97,98,99,100,101,102,103,104,105,106,107,109,110,111,112,128,129,130,131,132,133,146,147,148,149,150,151,152,153,154,155,156,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,189,192,193,195,196,197,199,200,201,205,206,207,208,212,213,215,218,219
2023-09-19T14:37:07.185 INFO:teuthology.orchestra.run.smithi084.stderr:force reremoving snap ids in the range of [1,234) from pool 3. reremoved snapids: 2,3,4,6,7,8,9,11,46,47,49,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,94,95,96,97,98,99,100,101,102,103,104,105,106,107,109,110,111,112,128,129,130,131,132,133,146,147,148,149,150,151,152,153,154,155,156,157,189,190,218,219,220,221,222,225,226,229,232,233
2023-09-19T14:42:13.540 INFO:teuthology.orchestra.run.smithi084.stderr:force reremoving snap ids in the range of [1,443) from pool 3. reremoved snapids: 2,3,4,6,7,8,9,11,46,47,49,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,94,95,96,97,98,99,100,101,102,103,104,105,106,107,109,110,111,112,128,129,130,131,132,133,146,147,148,149,150,151,152,153,154,155,156,157,189,190,218,219,220,221,222,223,224,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,283,284,285,286,287,347,348,349,350,383,384,385,386,387,388,389,394,395,396,426,427,428,429,432,433,434,438,441,442
2023-09-19T14:44:49.541 INFO:teuthology.orchestra.run.smithi084.stderr:force reremoving snap ids in the range of [1,563) from pool 3. reremoved snapids: 2,3,4,6,7,8,9,11,46,47,49,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,94,95,96,97,98,99,100,101,102,103,104,105,106,107,109,110,111,112,128,129,130,131,132,133,146,147,148,149,150,151,152,153,154,155,156,157,189,190,218,219,220,221,222,223,224,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,283,284,285,286,287,347,348,349,350,383,384,385,386,387,388,389,394,395,396,426,427,428,429,492,493,494,495,496,497,498,499,526,527,528,529,530,536,537,538,539,543,552,554,561

https://pulpito.ceph.com/matan-2023-09-19_13:58:13-rados:thrash-wip-matanb-reremove-snap-only-distro-default-smithi/7398191/

Original PR : #53235

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This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from ae85111 to 70c85ab Compare October 31, 2023 10:07
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Matan-B commented Oct 31, 2023

@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from 70c85ab to 99d7d63 Compare November 6, 2023 13:50
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This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

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This pull request has been automatically marked as stale because it has not had any activity for 60 days. It will be closed if no further activity occurs for another 30 days.
If you are a maintainer or core committer, please follow-up on this pull request to identify what steps should be taken by the author to move this proposed change forward.
If you are the author of this pull request, thank you for your proposed contribution. If you believe this change is still appropriate, please ensure that any feedback has been addressed and ask for a code review.

@github-actions github-actions bot added the stale label Feb 16, 2024
@Matan-B Matan-B changed the title osd: Add force-reremove-snap mon command osd: Add force-remove-snap mon command Mar 3, 2024
@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from 99d7d63 to b76825b Compare March 3, 2024 14:44
@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from b76825b to cd6fd40 Compare March 3, 2024 14:59
@github-actions github-actions bot removed the stale label Mar 3, 2024
@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from cd6fd40 to c979234 Compare March 3, 2024 15:08
@Matan-B Matan-B requested review from athanatos and rzarzynski March 3, 2024 15:09
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@Matan-B Matan-B marked this pull request as ready for review March 4, 2024 09:09
@Matan-B Matan-B requested a review from a team as a code owner March 4, 2024 09:09
@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from c979234 to 96cc714 Compare March 5, 2024 11:09
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@Matan-B Matan-B changed the title osd: Add force-remove-snap mon command mon: Add force-remove-snap mon command Mar 5, 2024
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Would be great to have the teuthology coverage for the new command.

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Matan-B commented Mar 5, 2024

Would be great to have the teuthology coverage for the new command.

I added teuthology coverage in the second commit: 57da5c5

@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from 96cc714 to 57da5c5 Compare March 5, 2024 15:00
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One substantive question about the --purged-snaps-only flag implementation along with some clarification requests.

if (res == 0) {
ss << "snapids: " << i << "was already marked as purged";
// Reremove the already purged_snaps
if (purged_snaps_only) {
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I don't understand this condition. In this branch, the snap in question has already been purged. Seems like that means we should re-remove whether or not --purged-snaps-only was passed?

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When using the purged_snaps_only variant, only the snaps which were already marked as purged are removed again. I have added an explanatory comment to emphasize this.

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The purged-snaps-only is considered "Experimental" (and not default) because of the Kludge mentioned with this variant later on. Adding the snap id both to new_purged_snaps and to new_removed_snaps is not conventional and may cause issues which are less obvious to identify easily.
Where the "Default" variant is imitating the normal behavior of removing snap ids and is less prone to unexpected results.

force_removed_snapids.insert(i);
}
} else {
if (!purged_snaps_only) {
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By contrast, this condition looks right. The snap wasn't purged so we only want to remove it if --purged-snaps-only wasn't passed.

In other words -- the set of snaps re-removed with --purged-snaps-only should be a subset of the set purged without it, right?

This is the kind of clarification the comment I requested at the top should address.

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By contrast, this condition looks right. The snap wasn't purged so we only want to remove it if --purged-snaps-only wasn't passed.

Right. However, the default/non-default variant are mutually exclusive. (Mentioned in comment)

@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from 57da5c5 to b370cd5 Compare March 7, 2024 15:19
@Matan-B Matan-B requested a review from athanatos March 7, 2024 15:20
```
    /*
     *  Forces removal of snapshots in the range of
     *  [lower_snapid_bound, upper_snapid_bound) on pool <pool>
     *  in order to cause OSDs to re-trim them.
     *  The command has two mutually exclusive variants:
     *  * Default: All the snapids in the given range which are not
     *    marked as purged in the Monitor will be removed. Mostly useful
     *    for cases in which the snapid is leaked in the client side.
     *    See: https://tracker.ceph.com/issues/64646
     *  * (Experimental) purged-snaps-only: Adding this flag will result
     *    in the reremoval of snapids in the given range.
     *    Only the snapids which are *already* marked as purged in the
     *    Monitor will be removed again. This may be useful for cases in
     *    which we would like to trigger OSD snap trimming again.
     */
```

Signed-off-by: Matan Breizman <mbreizma@redhat.com>
@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from b370cd5 to 0ee333c Compare March 7, 2024 16:05
Signed-off-by: Matan Breizman <mbreizma@redhat.com>
@Matan-B Matan-B force-pushed the wip-matanb-reremove-snap-only branch from 0ee333c to cafad77 Compare March 10, 2024 09:27
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Matan-B commented Mar 26, 2024

jenkins test make check

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Hey @Matan-B this failure in teuthology looks related to the snaps-few-objects-redelete change:
description: rados/thrash/{0-size-min-size-overrides/2-size-2-min-size 1-pg-log-overrides/normal_pg_log
2-recovery-overrides/{more-async-partial-recovery} 3-scrub-overrides/{max-simultaneous-scrubs-5}
backoff/normal ceph clusters/{fixed-4 openstack} crc-failures/bad_map_crc_failure
d-balancer/upmap-read mon_election/classic msgr-failures/fastclose msgr/async-v1only
objectstore/bluestore-comp-zstd rados supported-random-distro$/{ubuntu_latest} thrashers/pggrow
thrashosds-health workloads/snaps-few-objects-redelete}
/a/yuriw-2024-04-11_17:03:54-rados-wip-yuri6-testing-2024-04-02-1310-distro-default-smithi/7652478

2024-04-12T01:06:16.699 DEBUG:teuthology.orchestra.run.smithi042:> sudo adjust-ulimits ceph-coverage /home/ubuntu/cephtest/archive/coverage timeout 120 ceph --cluster ceph osd pool force-remove-snap unique_pool_0 --purged-snaps-only
...
2024-04-12T01:09:09.030 INFO:tasks.rados.rados.0.smithi176.stdout:1798:  finishing write tid 1 to smithi17628761-15
2024-04-12T01:09:09.030 INFO:tasks.rados.rados.0.smithi176.stdout:1798:  finishing write tid 2 to smithi17628761-15
2024-04-12T01:09:09.030 INFO:tasks.rados.rados.0.smithi176.stdout:1798:  finishing write tid 3 to smithi17628761-15
2024-04-12T01:09:09.030 INFO:tasks.rados.rados.0.smithi176.stdout:1798:  finishing write tid 4 to smithi17628761-15
2024-04-12T01:09:09.030 INFO:tasks.rados.rados.0.smithi176.stdout:1798:  oid 15 updating version 0 to 391
2024-04-12T01:09:09.030 INFO:tasks.rados.rados.0.smithi176.stdout:1798:  oid 15 updating version 391 to 392
2024-04-12T01:09:09.031 INFO:tasks.rados.rados.0.smithi176.stdout:1798:  oid 15 version 392 is already newer than 390
2024-04-12T01:09:09.031 INFO:tasks.rados.rados.0.smithi176.stdout:update_object_version oid 15 v 392 (ObjNum 642 snap 171 seq_num 642) dirty exists
2024-04-12T01:09:09.031 INFO:tasks.rados.rados.0.smithi176.stdout:1798:  left oid 15 (ObjNum 642 snap 171 seq_num 642)
2024-04-12T01:09:09.034 ERROR:teuthology.orchestra.daemon.state:Failed to send signal 1: None
Traceback (most recent call last):
  File "/home/teuthworker/src/git.ceph.com_teuthology_6c637841c215537a4502385240412f1966e0faab/teuthology/orchestra/daemon/state.py", line 108, in signal
    self.proc.stdin.write(struct.pack('!b', sig))
  File "/home/teuthworker/src/git.ceph.com_teuthology_6c637841c215537a4502385240412f1966e0faab/virtualenv/lib/python3.8/site-packages/paramiko/file.py", line 385, in write
    raise IOError("File is closed")
OSError: File is closed

@@ -0,0 +1,23 @@
overrides:
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Also with this test:

description: rados/thrash/{0-size-min-size-overrides/3-size-2-min-size 1-pg-log-overrides/short_pg_log
2-recovery-overrides/{more-async-partial-recovery} 3-scrub-overrides/{max-simultaneous-scrubs-5}
backoff/peering ceph clusters/{fixed-4 openstack} crc-failures/default d-balancer/crush-compat
mon_election/connectivity msgr-failures/few msgr/async-v2only objectstore/bluestore-comp-lz4
rados supported-random-distro$/{ubuntu_latest} thrashers/careful thrashosds-health
workloads/pool-snaps-few-objects-redelete}

/a/yuriw-2024-04-11_17:03:54-rados-wip-yuri6-testing-2024-04-02-1310-distro-default-smithi/7652491

2024-04-12T01:38:22.133 INFO:tasks.ceph.osd.7.smithi169.stderr:./src/osd/PG.cc: 1901: FAILED ceph_assert(!bad || !cct->_conf->osd_debug_verify_cached_snaps)
2024-04-12T01:38:22.133 INFO:tasks.ceph.osd.7.smithi169.stderr:
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: ceph version 19.0.0-2838-ga5074d45 (a5074d4516d566e9d8b6aec912f26afd099de101) squid (dev)
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x118) [0x55691a976362]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 2: ceph-osd(+0x3f6519) [0x55691a976519]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 3: ceph-osd(+0x38f81c) [0x55691a90f81c]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 4: (PeeringState::Active::react(PeeringState::AdvMap const&)+0x19e) [0x55691ad92e5e]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 5: ceph-osd(+0x840811) [0x55691adc0811]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 6: (PeeringState::advance_map(std::shared_ptr<OSDMap const>, std::shared_ptr<OSDMap const>, std::vector<int, std::allocator<int> >&, int, std::vector<int, std::allocator<int> >&, int, PeeringCtx&)+0x266) [0x55691ad596e6]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 7: (PG::handle_advance_map(std::shared_ptr<OSDMap const>, std::shared_ptr<OSDMap const>, std::vector<int, std::allocator<int> >&, int, std::vector<int, std::allocator<int> >&, int, PeeringCtx&)+0xfb) [0x55691ab7a76b]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 8: (OSD::advance_pg(unsigned int, PG*, ThreadPool::TPHandle&, PeeringCtx&)+0x39c) [0x55691aaf318c]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 9: (OSD::dequeue_peering_evt(OSDShard*, PG*, std::shared_ptr<PGPeeringEvent>, ThreadPool::TPHandle&)+0x237) [0x55691ab04957]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 10: (ceph::osd::scheduler::PGPeeringItem::run(OSD*, OSDShard*, boost::intrusive_ptr<PG>&, ThreadPool::TPHandle&)+0x51) [0x55691ad374f1]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 11: (OSD::ShardedOpWQ::_process(unsigned int, ceph::heartbeat_handle_d*)+0xab3) [0x55691ab0e6e3]
2024-04-12T01:38:22.134 INFO:tasks.ceph.osd.7.smithi169.stderr: 12: (ShardedThreadPool::shardedthreadpool_worker(unsigned int)+0x293) [0x55691b0024e3]
2024-04-12T01:38:22.135 INFO:tasks.ceph.osd.7.smithi169.stderr: 13: ceph-osd(+0xa82a44) [0x55691b002a44]
2024-04-12T01:38:22.135 INFO:tasks.ceph.osd.7.smithi169.stderr: 14: /lib/x86_64-linux-gnu/libc.so.6(+0x94b43) [0x7f9933f96b43]
2024-04-12T01:38:22.135 INFO:tasks.ceph.osd.7.smithi169.stderr: 15: /lib/x86_64-linux-gnu/libc.so.6(+0x126a00) [0x7f9934028a00]

The fix for https://tracker.ceph.com/issues/64347 is already included in the test branch, so this seems like a new crash related to this particular test.

@@ -0,0 +1,19 @@
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This failure also looks related to this test:

/a/yuriw-2024-04-11_17:03:54-rados-wip-yuri6-testing-2024-04-02-1310-distro-default-smithi/7652505

2024-04-12T01:51:20.020 INFO:tasks.thrashosds.thrasher:Traceback (most recent call last):
  File "/home/teuthworker/src/github.com_ceph_ceph-c_a5074d4516d566e9d8b6aec912f26afd099de101/qa/tasks/ceph_manager.py", line 190, in wrapper
    return func(self)
  File "/home/teuthworker/src/github.com_ceph_ceph-c_a5074d4516d566e9d8b6aec912f26afd099de101/qa/tasks/ceph_manager.py", line 1483, in _do_thrash
    self.choose_action()()
  File "/home/teuthworker/src/github.com_ceph_ceph-c_a5074d4516d566e9d8b6aec912f26afd099de101/qa/tasks/ceph_manager.py", line 1321, in <lambda>
    self.inject_pause(key,
  File "/home/teuthworker/src/github.com_ceph_ceph-c_a5074d4516d566e9d8b6aec912f26afd099de101/qa/tasks/ceph_manager.py", line 1065, in inject_pause
    self.ceph_manager.set_config(the_one, **{conf_key: duration})
  File "/home/teuthworker/src/github.com_ceph_ceph-c_a5074d4516d566e9d8b6aec912f26afd099de101/qa/tasks/ceph_manager.py", line 2093, in set_config
    self.wait_run_admin_socket(
  File "/home/teuthworker/src/github.com_ceph_ceph-c_a5074d4516d566e9d8b6aec912f26afd099de101/qa/tasks/ceph_manager.py", line 2050, in wait_run_admin_socket
    raise Exception('timed out waiting for admin_socket '
Exception: timed out waiting for admin_socket to appear after osd.4 restart

Signed-off-by: Matan Breizman <mbreizma@redhat.com>
@Matan-B
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Matan-B commented May 19, 2024

This PR introduces a new command with 2 variations.
The non default one is quite more complex and less urgent to be merged.
I will separate the default behavior into #57548 and the non default (purged-snaps-only) variant to #57549

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4 participants