[
https://issues.apache.org/jira/browse/ZOOKEEPER-2789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020942#comment-16020942
]
ASF GitHub Bot commented on ZOOKEEPER-2789:
-------------------------------------------
Github user asdf2014 commented on the issue:
https://github.com/apache/zookeeper/pull/262
Seems like all test cases
[passed](https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/738/testReport/),
but some problems happened in `Zookeeper_operations` ::
`testOperationsAndDisconnectConcurrently1`:
```bash
[exec] BUILD FAILED
[exec]
/home/jenkins/jenkins-slave/workspace/PreCommit-ZOOKEEPER-github-pr-build/build.xml:1298:
The following error occurred while executing this line:
[exec]
/home/jenkins/jenkins-slave/workspace/PreCommit-ZOOKEEPER-github-pr-build/build.xml:1308:
exec returned: 2
[exec]
[exec] Total time: 15 minutes 45 seconds
[exec] /bin/kill -9 16911
[exec] [exec] Zookeeper_operations::testAsyncWatcher1 : assertion
: elapsed 1044
[exec] [exec] Zookeeper_operations::testAsyncGetOperation :
elapsed 4 : OK
[exec] [exec]
Zookeeper_operations::testOperationsAndDisconnectConcurrently1FAIL: zktest-mt
[exec] [exec] ==========================================
[exec] [exec] 1 of 2 tests failed
[exec] [exec] Please report to u...@zookeeper.apache.org
[exec] [exec] ==========================================
[exec] [exec] make[1]: Leaving directory
`/home/jenkins/jenkins-slave/workspace/PreCommit-ZOOKEEPER-github-pr-build/build/test/test-cppunit'
[exec] [exec] /bin/bash: line 5: 15116 Segmentation fault
ZKROOT=/home/jenkins/jenkins-slave/workspace/PreCommit-ZOOKEEPER-github-pr-build/src/c/../..
CLASSPATH=$CLASSPATH:$CLOVER_HOME/lib/clover.jar ${dir}$tst
[exec] [exec] make[1]: *** [check-TESTS] Error 1
[exec] [exec] make: *** [check-am] Error 2
[exec]
[exec] Running contrib tests.
[exec]
======================================================================
[exec]
[exec] /home/jenkins/tools/ant/apache-ant-1.9.9/bin/ant
-DZookeeperPatchProcess= -Dtest.junit.output.format=xml -Dtest.output=yes
test-contrib
[exec] Buildfile:
/home/jenkins/jenkins-slave/workspace/PreCommit-ZOOKEEPER-github-pr-build/build.xml
[exec]
[exec] test-contrib:
[exec]
[exec] BUILD SUCCESSFUL
[exec] Total time: 0 seconds
```
> Reassign `ZXID` for solving 32bit overflow problem
> --------------------------------------------------
>
> Key: ZOOKEEPER-2789
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2789
> Project: ZooKeeper
> Issue Type: Bug
> Components: quorum
> Affects Versions: 3.5.3
> Reporter: Benedict Jin
> Fix For: 3.6.0
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> If it is `1k/s` ops, then as long as $2^32 / (86400 * 1000) \approx 49.7$
> days ZXID will exhausted. But, if we reassign the `ZXID` into 16bit for
> `epoch` and 48bit for `counter`, then the problem will not occur until after
> $Math.min(2^16 / 365, 2^48 / (86400 * 1000 * 365)) \approx Math.min(179.6,
> 8925.5) = 179.6$ years.
> However, i thought the ZXID is `long` type, reading and writing the long type
> (and `double` type the same) in JVM, is divided into high 32bit and low 32bit
> part of the operation, and because the `ZXID` variable is not modified with
> `volatile` and is not boxed for the corresponding reference type (`Long` /
> `Double`), so it belongs to [non-atomic operation]
> (https://docs.oracle.com/javase/specs/jls/se8 /html/jls-17.html#jls-17.7).
> Thus, if the lower 32 bits of the upper 32 bits are divided into the entire
> 32 bits of the `long`, there may be a concurrent problem.
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