ctubbsii commented on issue #1909:
URL: https://github.com/apache/accumulo/issues/1909#issuecomment-774047768
@dlmarion In answer to your previous question about how frequent the failure
is: it has failed in 4 out of 4 Jenkins builds since #1896. The ConnectionLoss
was the first I saw, but the other 3 were:
```java
java.lang.AssertionError
at org.junit.Assert.fail(Assert.java:87)
at org.junit.Assert.assertTrue(Assert.java:42)
at org.junit.Assert.assertTrue(Assert.java:53)
at
org.apache.accumulo.test.fate.zookeeper.ZooLockIT.testLockSerial(ZooLockIT.java:436)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
```
One had an repeated message in STDOUT that looked like:
```
2021-02-05T04:34:20,692 [zookeeper.ZooLock] DEBUG:
[zlock#f1fde7ea-8561-4744-a1e0-85fad77cb5f7#] Renewing watch on prior node
/zltestDeleteWaiting-1685185170-l1/zlock#64cdee91-3fc3-4957-b57c-d6bf315bb550#0000000000
```
Two others had:
```
2021-02-04T23:37:51,181 [zookeeper.ZooLock] DEBUG:
[zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#] Ephemeral node
/zlretryLockSerial/zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#0000000000 created
2021-02-04T23:37:51,182 [zookeeper.ZooLock] DEBUG: validating and sorting
children at path /zlretryLockSerial
2021-02-04T23:37:51,182 [zookeeper.ZooLock] DEBUG: Children nodes: 1
2021-02-04T23:37:51,183 [zookeeper.ZooLock] DEBUG: -
zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#0000000000
2021-02-04T23:37:51,183 [zookeeper.ZooLock] DEBUG:
[zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#] Setting watcher on
/zlretryLockSerial/zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#0000000000
2021-02-04T23:37:51,184 [zookeeper.ZooLock] DEBUG: validating and sorting
children at path /zlretryLockSerial
2021-02-04T23:37:51,184 [zookeeper.ZooLock] DEBUG: Children nodes: 1
2021-02-04T23:37:51,184 [zookeeper.ZooLock] DEBUG: -
zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#0000000000
2021-02-04T23:37:51,184 [zookeeper.ZooLock] DEBUG:
[zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#] First candidate is my lock,
acquiring...
2021-02-04T23:37:51,186 [zookeeper.ZooLock] DEBUG:
[zlock#00000000-0000-0000-0000-bbbbbbbbbbbb#] Ephemeral node
/zlretryLockSerial/zlock#00000000-0000-0000-0000-bbbbbbbbbbbb#0000000001 created
2021-02-04T23:37:51,187 [zookeeper.ZooLock] DEBUG: validating and sorting
children at path /zlretryLockSerial
2021-02-04T23:37:51,187 [zookeeper.ZooLock] DEBUG: Children nodes: 2
2021-02-04T23:37:51,187 [zookeeper.ZooLock] DEBUG: -
zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#0000000000
2021-02-04T23:37:51,187 [zookeeper.ZooLock] DEBUG: -
zlock#00000000-0000-0000-0000-bbbbbbbbbbbb#0000000001
2021-02-04T23:37:51,187 [zookeeper.ZooLock] DEBUG:
[zlock#00000000-0000-0000-0000-bbbbbbbbbbbb#] Setting watcher on
/zlretryLockSerial/zlock#00000000-0000-0000-0000-bbbbbbbbbbbb#0000000001
2021-02-04T23:37:51,188 [zookeeper.ZooLock] DEBUG: validating and sorting
children at path /zlretryLockSerial
2021-02-04T23:37:51,188 [zookeeper.ZooLock] DEBUG: Children nodes: 2
2021-02-04T23:37:51,189 [zookeeper.ZooLock] DEBUG: -
zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#0000000000
2021-02-04T23:37:51,189 [zookeeper.ZooLock] DEBUG: -
zlock#00000000-0000-0000-0000-bbbbbbbbbbbb#0000000001
2021-02-04T23:37:51,189 [zookeeper.ZooLock] DEBUG:
[zlock#00000000-0000-0000-0000-bbbbbbbbbbbb#] Lock held by another process with
ephemeral node: zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#0000000000
2021-02-04T23:37:51,189 [zookeeper.ZooLock] DEBUG:
[zlock#00000000-0000-0000-0000-bbbbbbbbbbbb#] Establishing watch on prior node
/zlretryLockSerial/zlock#00000000-0000-0000-0000-aaaaaaaaaaaa#0000000000
```
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