James Brown created CASSANDRA-17172:
---------------------------------------
Summary: incremental repairs get stuck often
Key: CASSANDRA-17172
URL: https://issues.apache.org/jira/browse/CASSANDRA-17172
Project: Cassandra
Issue Type: Bug
Components: Consistency/Repair
Reporter: James Brown
We're on 4.0.1 and switched to incremental repairs shortly after upgrading to
4.0.x. They work fine about 95% of the time, but once in a while a session will
get stuck and will have to be cancelled (with `nodetool repair_admin cancel -s
<uuid>`). Typically the session will be in REPAIRING but nothing will actually
be happening.
Output of nodetool repair_admin:
{{$ nodetool repair_admin
id | state | last activity | coordinator
| participants
| participants_wp
3a059b10-4ef6-11ec-925f-8f7bcf0ba035 | REPAIRING | 6771 (s) |
/[fd00:ea51:d057:200:1:0:0:8e]:25472 |
fd00:ea51:d057:200:1:0:0:8e,fd00:ea51:d057:200:1:0:0:8f,fd00:ea51:d057:200:1:0:0:92,fd00:ea51:d057:100:1:0:0:571,fd00:ea51:d057:100:1:0:0:570,fd00:ea51:d057:200:1:0:0:93,fd00:ea51:d057:100:1:0:0:573,fd00:ea51:d057:200:1:0:0:90,fd00:ea51:d057:200:1:0:0:91,fd00:ea51:d057:100:1:0:0:572,fd00:ea51:d057:100:1:0:0:575,fd00:ea51:d057:100:1:0:0:574,fd00:ea51:d057:200:1:0:0:94,fd00:ea51:d057:100:1:0:0:577,fd00:ea51:d057:200:1:0:0:95,fd00:ea51:d057:100:1:0:0:576
|
[fd00:ea51:d057:200:1:0:0:8e]:25472,[fd00:ea51:d057:200:1:0:0:8f]:25472,[fd00:ea51:d057:200:1:0:0:92]:25472,[fd00:ea51:d057:100:1:0:0:571]:25472,[fd00:ea51:d057:100:1:0:0:570]:25472,[fd00:ea51:d057:200:1:0:0:93]:25472,[fd00:ea51:d057:100:1:0:0:573]:25472,[fd00:ea51:d057:200:1:0:0:90]:25472,[fd00:ea51:d057:200:1:0:0:91]:25472,[fd00:ea51:d057:100:1:0:0:572]:25472,[fd00:ea51:d057:100:1:0:0:575]:25472,[fd00:ea51:d057:100:1:0:0:574]:25472,[fd00:ea51:d057:200:1:0:0:94]:25472,[fd00:ea51:d057:100:1:0:0:577]:25472,[fd00:ea51:d057:200:1:0:0:95]:25472,[fd00:ea51:d057:100:1:0:0:576]:25472}}
Running `jstack` on the coordinator shows two repair threads, both idle:
{{"Repair#167:1" #602177 daemon prio=5 os_prio=0 cpu=9.60ms elapsed=57359.81s
tid=0x00007fa6d1741800 nid=0x18e6c waiting on condition [0x00007fc529f9a000]
java.lang.Thread.State: TIMED_WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@11.0.11/Native Method)
- parking to wait for <0x000000045ba93a18> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.parkNanos(java.base@11.0.11/LockSupport.java:234)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@11.0.11/AbstractQueuedSynchronizer.java:2123)
at
java.util.concurrent.LinkedBlockingQueue.poll(java.base@11.0.11/LinkedBlockingQueue.java:458)
at
java.util.concurrent.ThreadPoolExecutor.getTask(java.base@11.0.11/ThreadPoolExecutor.java:1053)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.11/ThreadPoolExecutor.java:1114)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.11/ThreadPoolExecutor.java:628)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(java.base@11.0.11/Thread.java:829)
"Repair#170:1" #654814 daemon prio=5 os_prio=0 cpu=9.62ms elapsed=7369.98s
tid=0x00007fa6aec09000 nid=0x1a96f waiting on condition [0x00007fc535aae000]
java.lang.Thread.State: TIMED_WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@11.0.11/Native Method)
- parking to wait for <0x00000004c45bf7d8> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.parkNanos(java.base@11.0.11/LockSupport.java:234)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@11.0.11/AbstractQueuedSynchronizer.java:2123)
at
java.util.concurrent.LinkedBlockingQueue.poll(java.base@11.0.11/LinkedBlockingQueue.java:458)
at
java.util.concurrent.ThreadPoolExecutor.getTask(java.base@11.0.11/ThreadPoolExecutor.java:1053)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.11/ThreadPoolExecutor.java:1114)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.11/ThreadPoolExecutor.java:628)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(java.base@11.0.11/Thread.java:829)}}
nodetool netstats says there is nothing happening:
{{$ nodetool netstats | head -n 2
Mode: NORMAL
Not sending any streams.}}
There's nothing interesting in the logs for this repair; the last relevant
thing was a bunch of "Created 0 sync tasks based on 6 merkle tree responses for
3a059b10-4ef6-11ec-
925f-8f7bcf0ba035 (took: 0ms)" and then back and forth for the last couple of
hours with things like
{{2021-11-26T21:33:20Z cassandra10nuq 129529 | INFO [OptionalTasks:1]
LocalSessions.java:938 - Attempting to learn the outcome of unfinished local
incremental repair session 3a059b10-4ef6-11ec-925f-8f7bcf0ba035
2021-11-26T21:33:20Z cassandra10nuq 129529 | INFO [AntiEntropyStage:1]
LocalSessions.java:987 - Received StatusResponse for repair session
3a059b10-4ef6-11ec-925f-8f7bcf0ba035 with state REPAIRING, which is not
actionable. Doing nothing.}}
Typically, cancelling the session and rerunning with the exact same command
line will succeed.
I haven't witnessed this behavior in our testing cluster; it seems to only
happen on biggish keyspaces.
I know there have historically been issues which this, which is why tools like
Reaper kill any repair that takes more than a short period of time, but I also
thought they were expected to have been fixed with 4.0.
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