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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4060) Transient ZooKeeper connection issues kills FATE Runner threads
Date Thu, 19 Nov 2015 03:38:11 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15012720#comment-15012720
] 

Josh Elser commented on ACCUMULO-4060:
--------------------------------------

I can see some options here to fix this:

1. Tank the JVM if a repo-runner thread dies. This is quick and dirty (often how we tend to
react to zookeeper issues) and could result in operator headache, having to restart the Master.
2. Re-launch repo-runner threads to always reach the desired number of threads. This will
help keep the master running in the transient-connection-issue cases, but it could potentially
mask a bigger issue that does require human interaction (of course, is not reading the logs
and expecting the process to die really a good excuse?)
3. Something else entirely?

[~kturner], [~ecn], [~ctubbsii], your opinions would be appreciated.

> Transient ZooKeeper connection issues kills FATE Runner threads
> ---------------------------------------------------------------
>
>                 Key: ACCUMULO-4060
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4060
>             Project: Accumulo
>          Issue Type: Bug
>          Components: fate, master
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 1.7.1, 1.8.0
>
>
> Noticed this the following on a 6 node Accumulo cluster with Kerberos and quality of
protection set to auth-conf (wire encryption). The cluster appeared to be up and running --
healthy. Attempts to create a table via the shell was hung in the CreateTableCommand, polling
on the FATE operation. After a few minutes, it made no progress.
> Inspecting the FATE transactions showed that there were (multiple) FATE ops running,
but none where locked or locking any tables, nor making any progress.
> This lead me to inspect the Master's log to figure out why it wasn't making any progress,
and, to my joy, I found the following:
> {noformat}
> 2015-11-18 23:18:30,784 [fate.Fate] ERROR: Thread "Repo runner 0" died org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
> java.lang.RuntimeException: org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
>         at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:189)
>         at org.apache.accumulo.fate.AgeOffStore.reserve(AgeOffStore.java:158)
>         at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:60)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode
= ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>         at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1472)
>         at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1500)
>         at org.apache.accumulo.fate.zookeeper.ZooReader.getChildren(ZooReader.java:151)
>         at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:128)
>         ... 6 more
> 2015-11-18 23:18:30,783 [fate.Fate] ERROR: Thread "Repo runner 2" died org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
> java.lang.RuntimeException: org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
>         at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:189)
>         at org.apache.accumulo.fate.AgeOffStore.reserve(AgeOffStore.java:158)
>         at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:60)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode
= ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>         at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1472)
>         at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1500)
>         at org.apache.accumulo.fate.zookeeper.ZooReader.getChildren(ZooReader.java:151)
>         at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:128)
>         ... 6 more
> 2015-11-18 23:18:30,787 [fate.Fate] ERROR: Thread "Repo runner 1" died org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
> java.lang.RuntimeException: org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
>         at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:189)
>         at org.apache.accumulo.fate.AgeOffStore.reserve(AgeOffStore.java:158)
>         at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:60)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode
= ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>         at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1472)
>         at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1500)
>         at org.apache.accumulo.fate.zookeeper.ZooReader.getChildren(ZooReader.java:151)
>         at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:128)
>         ... 6 more
> 2015-11-18 23:18:30,787 [fate.Fate] ERROR: Thread "Repo runner 3" died org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
> java.lang.RuntimeException: org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
>         at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:189)
>         at org.apache.accumulo.fate.AgeOffStore.reserve(AgeOffStore.java:158)
>         at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:60)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode
= ConnectionLoss for /accumulo/a1af6ffa-720b-4ec3-8198-5891010294a5/fate
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>         at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1472)
>         at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1500)
>         at org.apache.accumulo.fate.zookeeper.ZooReader.getChildren(ZooReader.java:151)
>         at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:128)
>         ... 6 more
> {noformat}
> This happened at the end of a ~30s period of difficulties in the Master communicating
with ZooKeeper. I've yet to investigate why this pause happened, but the fact that the FATE
runner threads died and the Master kept running is no good.



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