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https://issues.apache.org/jira/browse/HIVE-20682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16663616#comment-16663616
]
Hive QA commented on HIVE-20682:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {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:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
19s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m
33s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m
9s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
10s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
38s{color} | {color:blue} itests/hive-unit in master has 2 extant Findbugs
warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 3m
51s{color} | {color:blue} ql in master has 2317 extant Findbugs warnings.
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
36s{color} | {color:blue} service in master has 48 extant Findbugs warnings.
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
36s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
9s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m
4s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 2m
4s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
21s{color} | {color:green} The patch hive-unit passed checkstyle {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
38s{color} | {color:green} ql: The patch generated 0 new + 218 unchanged - 1
fixed = 218 total (was 219) {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
13s{color} | {color:green} The patch service passed checkstyle {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m
30s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
34s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 0m
13s{color} | {color:red} The patch generated 2 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 32m 43s{color} |
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Optional Tests | asflicense javac javadoc findbugs checkstyle compile |
| uname | Linux hiveptest-server-upstream 3.16.0-4-amd64 #1 SMP Debian
3.16.36-1+deb8u1 (2016-09-03) x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-14638/dev-support/hive-personality.sh
|
| git revision | master / a99be34 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| asflicense |
http://104.198.109.242/logs//PreCommit-HIVE-Build-14638/yetus/patch-asflicense-problems.txt
|
| modules | C: itests/hive-unit ql service U: . |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-14638/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Async query execution can potentially fail if shared sessionHive is closed by
> master thread.
> --------------------------------------------------------------------------------------------
>
> Key: HIVE-20682
> URL: https://issues.apache.org/jira/browse/HIVE-20682
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 3.1.0, 4.0.0
> Reporter: Sankar Hariappan
> Assignee: Sankar Hariappan
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-20682.01.patch, HIVE-20682.02.patch
>
>
> *Problem description:*
> The master thread initializes the *sessionHive* object in *HiveSessionImpl*
> class when we open a new session for a client connection and by default all
> queries from this connection shares the same sessionHive object.
> If the master thread executes a *synchronous* query, it closes the
> sessionHive object (referred via thread local hiveDb) if
> {{Hive.isCompatible}} returns false and sets new Hive object in thread local
> HiveDb but doesn't change the sessionHive object in the session. Whereas,
> *asynchronous* query execution via async threads never closes the sessionHive
> object and it just creates a new one if needed and sets it as their thread
> local hiveDb.
> So, the problem can happen in the case where an *asynchronous* query is being
> executed by async threads refers to sessionHive object and the master thread
> receives a *synchronous* query that closes the same sessionHive object.
> Also, each query execution overwrites the thread local hiveDb object to
> sessionHive object which potentially leaks a metastore connection if the
> previous synchronous query execution re-created the Hive object.
> *Possible Fix:*
> We shall maintain an Atomic reference counter in the Hive object. We
> increment the counter when somebody sets it in thread local hiveDb and
> decrement it when somebody releases it. Only when the counter is down to 0,
> we should close the connection.
> Couple of cases to release the thread local hiveDb:
> * When synchronous query execution in master thread re-creates Hive object
> due to config change. We also, need to update the sessionHive object in the
> current session as we releases it from thread local hiveDb of master thread.
> * When async thread exits after completing execution or due to exception.
> If the session is getting closed, it is guaranteed that the reference counter
> is down to 0 as we forcefully close all the async operations and so we can
> close the connection there.
> cc [~pvary]
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