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https://issues.apache.org/jira/browse/HIVE-20740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16684487#comment-16684487
 ] 

Hive QA commented on HIVE-20740:
--------------------------------

| (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 
27s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
17s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m  
0s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 1s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
37s{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 
42s{color} | {color:blue} ql in master has 2316 extant Findbugs warnings. 
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  1m  
4s{color} | {color:blue} standalone-metastore/metastore-server in master has 
185 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:red}-1{color} | {color:red} mvninstall {color} | {color:red}  0m 
33s{color} | {color:red} hive-unit in the patch failed. {color} |
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red}  0m 
31s{color} | {color:red} ql in the patch failed. {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m  
1s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  2m  
1s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
20s{color} | {color:red} itests/hive-unit: The patch generated 1 new + 608 
unchanged - 0 fixed = 609 total (was 608) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  1m 
10s{color} | {color:red} standalone-metastore/metastore-server generated 1 new 
+ 183 unchanged - 2 fixed = 184 total (was 185) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
37s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
13s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 30m 54s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:standalone-metastore/metastore-server |
|  |  
org.apache.hadoop.hive.metastore.PersistenceManagerProvider.updatePmfProperties(Configuration)
 does not release lock on all paths  At PersistenceManagerProvider.java:on all 
paths  At PersistenceManagerProvider.java:[line 152] |
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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-14896/dev-support/hive-personality.sh
 |
| git revision | master / bc39c49 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| mvninstall | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-14896/yetus/patch-mvninstall-itests_hive-unit.txt
 |
| mvninstall | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-14896/yetus/patch-mvninstall-ql.txt
 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-14896/yetus/diff-checkstyle-itests_hive-unit.txt
 |
| findbugs | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-14896/yetus/new-findbugs-standalone-metastore_metastore-server.html
 |
| modules | C: itests/hive-unit ql standalone-metastore/metastore-server U: . |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-14896/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Remove global lock in ObjectStore.setConf method
> ------------------------------------------------
>
>                 Key: HIVE-20740
>                 URL: https://issues.apache.org/jira/browse/HIVE-20740
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Vihang Karajgaonkar
>            Assignee: Vihang Karajgaonkar
>            Priority: Major
>         Attachments: HIVE-20740.01.patch, HIVE-20740.02.patch, 
> HIVE-20740.04.patch, HIVE-20740.05.patch, HIVE-20740.06.patch, 
> HIVE-20740.08.patch, HIVE-20740.09.patch, HIVE-20740.10.patch, 
> HIVE-20740.11.patch, HIVE-20740.12.patch
>
>
> The ObjectStore#setConf method has a global lock which can block other 
> clients in concurrent workloads.
> {code}
> @Override
>   @SuppressWarnings("nls")
>   public void setConf(Configuration conf) {
>     // Although an instance of ObjectStore is accessed by one thread, there 
> may
>     // be many threads with ObjectStore instances. So the static variables
>     // pmf and prop need to be protected with locks.
>     pmfPropLock.lock();
>     try {
>       isInitialized = false;
>       this.conf = conf;
>       this.areTxnStatsSupported = MetastoreConf.getBoolVar(conf, 
> ConfVars.HIVE_TXN_STATS_ENABLED);
>       configureSSL(conf);
>       Properties propsFromConf = getDataSourceProps(conf);
>       boolean propsChanged = !propsFromConf.equals(prop);
>       if (propsChanged) {
>         if (pmf != null){
>           clearOutPmfClassLoaderCache(pmf);
>           if (!forTwoMetastoreTesting) {
>             // close the underlying connection pool to avoid leaks
>             pmf.close();
>           }
>         }
>         pmf = null;
>         prop = null;
>       }
>       assert(!isActiveTransaction());
>       shutdown();
>       // Always want to re-create pm as we don't know if it were created by 
> the
>       // most recent instance of the pmf
>       pm = null;
>       directSql = null;
>       expressionProxy = null;
>       openTrasactionCalls = 0;
>       currentTransaction = null;
>       transactionStatus = TXN_STATUS.NO_STATE;
>       initialize(propsFromConf);
>       String partitionValidationRegex =
>           MetastoreConf.getVar(this.conf, 
> ConfVars.PARTITION_NAME_WHITELIST_PATTERN);
>       if (partitionValidationRegex != null && 
> !partitionValidationRegex.isEmpty()) {
>         partitionValidationPattern = 
> Pattern.compile(partitionValidationRegex);
>       } else {
>         partitionValidationPattern = null;
>       }
>       // Note, if metrics have not been initialized this will return null, 
> which means we aren't
>       // using metrics.  Thus we should always check whether this is non-null 
> before using.
>       MetricRegistry registry = Metrics.getRegistry();
>       if (registry != null) {
>         directSqlErrors = 
> Metrics.getOrCreateCounter(MetricsConstants.DIRECTSQL_ERRORS);
>       }
>       this.batchSize = MetastoreConf.getIntVar(conf, 
> ConfVars.RAWSTORE_PARTITION_BATCH_SIZE);
>       if (!isInitialized) {
>         throw new RuntimeException(
>         "Unable to create persistence manager. Check dss.log for details");
>       } else {
>         LOG.debug("Initialized ObjectStore");
>       }
>     } finally {
>       pmfPropLock.unlock();
>     }
>   }
> {code}
> The {{pmfPropLock}} is a static object and it disallows any other new 
> connection to HMS which is trying to instantiate ObjectStore. We should 
> either remove the lock or reduce the scope of the lock so that it is held for 
> a very small amount of time.



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