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https://issues.apache.org/jira/browse/HBASE-18628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16133801#comment-16133801
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Hadoop QA commented on HBASE-18628:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
25s{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green} 0m
0s{color} | {color:green} Patch does not have any anti-patterns. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 2 new or modified test
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 4m
28s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
47s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
50s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
16s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m
27s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
30s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
41s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
41s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
48s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
15s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m
0s{color} | {color:red} The patch has 1 line(s) that end in whitespace. Use git
apply --whitespace=fix <<patch_file>>. Refer https://git-scm.com/docs/git-apply
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| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green}
34m 47s{color} | {color:green} Patch does not cause any errors with Hadoop
2.6.1 2.6.2 2.6.3 2.6.4 2.6.5 2.7.1 2.7.2 2.7.3 or 3.0.0-alpha4. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 4m
4s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
38s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}156m
14s{color} | {color:green} hbase-server in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
18s{color} | {color:green} The patch does not generate ASF License warnings.
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| {color:black}{color} | {color:black} {color} | {color:black}209m 39s{color} |
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hbase:bdc94b1 |
| JIRA Issue | HBASE-18628 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12882658/HBASE-18628.v2.patch |
| Optional Tests | asflicense javac javadoc unit findbugs hadoopcheck
hbaseanti checkstyle compile |
| uname | Linux ab708dbe8621 3.13.0-116-generic #163-Ubuntu SMP Fri Mar 31
14:13:22 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build@2/component/dev-support/hbase-personality.sh
|
| git revision | master / 56f9e1a |
| Default Java | 1.8.0_144 |
| findbugs | v3.1.0-RC3 |
| whitespace |
https://builds.apache.org/job/PreCommit-HBASE-Build/8162/artifact/patchprocess/whitespace-eol.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HBASE-Build/8162/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output |
https://builds.apache.org/job/PreCommit-HBASE-Build/8162/console |
| Powered by | Apache Yetus 0.4.0 http://yetus.apache.org |
This message was automatically generated.
> ZKPermissionWatcher blocks all ZK notifications
> -----------------------------------------------
>
> Key: HBASE-18628
> URL: https://issues.apache.org/jira/browse/HBASE-18628
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Mike Drob
> Assignee: Mike Drob
> Priority: Critical
> Attachments: HBASE-18628.patch, HBASE-18628.v2.patch, jstack
>
>
> Buckle up folks, we're going for a ride here. I've seeing this on a branch-2
> based build, but I think the problem will affect branch-1 as well. I'm not
> able to easily reproduce the issue, but it will usually come up within an
> hour on a given cluster that I have, at which point the problem persists
> until an RS restart. I've been seeing the problem and paying attention for
> maybe two months, but I suspect it's been happening much longer than that.
> h3. Problem
> When running in a secure cluster, sometimes the ZK EventThread will get stuck
> on a permissions update and not be able to process new notifications. This
> happens to also block flush and snapshot, which is how we found it.
> h3. Analysis
> The main smoking gun is seeing this in repeated jstacks:
> {noformat}
> "main-EventThread" #43 daemon prio=5 os_prio=0 tid=0x00007f0b92644000
> nid=0x6e69 waiting on condition [0x00007f0b6730f000]
> java.lang.Thread.State: TIMED_WAITING (sleeping)
> at java.lang.Thread.sleep(Native Method)
> at
> org.apache.hadoop.hbase.security.access.ZKPermissionWatcher.nodeChildrenChanged(ZKPermissionWatcher.java:191)
> at
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:503)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:522)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
> {noformat}
> That sleep is a 20ms sleep in an {{AtomicReference.compareAndSet}} loop - but
> it never gets past the condition.
> {code}
> while (!nodes.compareAndSet(null, nodeList)) {
> try {
> Thread.sleep(20);
> } catch (InterruptedException e) {
> LOG.warn("Interrupted while setting node list", e);
> Thread.currentThread().interrupt();
> }
> }
> {code}
> The warning never shows up in the logs, it just keeps looping and looping.
> The last relevant line from the watcher in logs is:
> {noformat}
> 2017-08-17 21:25:12,379 DEBUG
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher:
> regionserver:22101-0x15df38884c80024, quorum=zk1:2181,zk2:2181,zk3:2181,
> baseZNode=/hbase Received ZooKeeper Event, type=NodeChildrenChanged,
> state=SyncConnected, path=/hbase/acl
> {noformat}
> Which makes sense, because the code snippet is from permission watcher's
> {{nodeChildrenChanged}} handler.
> The separate thread introduced in HBASE-14370 is present, but not doing
> anything. And this event hasn't gotten to the part where it splits off into a
> thread:
> {noformat}
> "zk-permission-watcher4-thread-1" #160 daemon prio=5 os_prio=0
> tid=0x0000000001750800 nid=0x6fd9 waiting on condition [0x00007f0b5dce5000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000007436ecea0> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
> at
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
> at
> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
> h3. Solutions
> There's a few approaches we can take to fix this, I think they are all
> complimentary. It might be useful to file subtasks or new issues for some of
> the solutions if they are longer term.
> # Move flush and snapshot to ProcedureV2. This makes my proximate problem go
> away, but it's only relevant to branch-2 and master, and doesn't fix anything
> on branch-1. Also, Permissions updates would still get stuck, preventing
> future permissions updates. I think this is important long term for the
> robustness of the system, but not a viable short term fix.
> # Add an Executor to ZookeeperWatcher and launch threads from there. Maybe
> we'd want to pull the Executor out of ZKPW, but that's not strictly necessary
> and can be optimized later -- if we're already threading, then adding another
> layer isn't a huge cost.
> # Figure out the race condition or logic problem that causes {{nodes}} to be
> non-null above. I've tried looking at this and visual inspection isn't
> getting me anywhere.
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