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https://issues.apache.org/jira/browse/HIVE-20794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16689923#comment-16689923
 ] 

Hive QA commented on HIVE-20794:
--------------------------------

| (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 
36s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
15s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  4m 
30s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
47s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
33s{color} | {color:blue} common in master has 65 extant Findbugs warnings. 
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  2m 
15s{color} | {color:blue} standalone-metastore/metastore-common in master has 
29 extant Findbugs warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
36s{color} | {color:blue} itests/hive-unit in master has 2 extant Findbugs 
warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
40s{color} | {color:blue} itests/util in master has 48 extant Findbugs 
warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  3m 
45s{color} | {color:blue} ql in master has 2316 extant Findbugs warnings. 
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
37s{color} | {color:blue} service in master has 48 extant Findbugs warnings. 
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  1m  
3s{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}  4m 
12s{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}  5m 
 3s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  4m 
35s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  4m 
35s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
15s{color} | {color:green} The patch common passed checkstyle {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
 7s{color} | {color:green} The patch standalone-metastore passed checkstyle 
{color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
 7s{color} | {color:green} The patch metastore-common passed checkstyle {color} 
|
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
15s{color} | {color:green} The patch hive-unit passed checkstyle {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
11s{color} | {color:green} The patch util passed checkstyle {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
38s{color} | {color:green} ql: The patch generated 0 new + 17 unchanged - 4 
fixed = 17 total (was 21) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
11s{color} | {color:red} service: The patch generated 3 new + 35 unchanged - 0 
fixed = 38 total (was 35) {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
 7s{color} | {color:green} The patch metastore-server 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} xml {color} | {color:green}  0m  
3s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  0m 
45s{color} | {color:red} service generated 1 new + 48 unchanged - 0 fixed = 49 
total (was 48) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  4m 
13s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
12s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 55m 54s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:service |
|  |  Inconsistent synchronization of 
org.apache.hive.service.server.HiveServer2.zooKeeperHelper; locked 55% of time  
Unsynchronized access at HiveServer2.java:55% of time  Unsynchronized access at 
HiveServer2.java:[line 573] |
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|| Subsystem || Report/Notes ||
| Optional Tests |  asflicense  javac  javadoc  findbugs  checkstyle  compile  
xml  |
| 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-14965/dev-support/hive-personality.sh
 |
| git revision | master / c737dbd |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-14965/yetus/diff-checkstyle-service.txt
 |
| findbugs | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-14965/yetus/new-findbugs-service.html
 |
| modules | C: common standalone-metastore 
standalone-metastore/metastore-common itests/hive-unit itests/util ql service 
standalone-metastore/metastore-server U: . |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-14965/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Use Zookeeper for metastore service discovery
> ---------------------------------------------
>
>                 Key: HIVE-20794
>                 URL: https://issues.apache.org/jira/browse/HIVE-20794
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ashutosh Bapat
>            Assignee: Ashutosh Bapat
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-20794.01, HIVE-20794.02
>
>
> Right now, multiple metastore services can be specified in 
> hive.metastore.uris configuration, but that list is static and can not be 
> modified dynamically. Use Zookeeper for dynamic service discovery of 
> metastore.
> h3. Improve ZooKeeperHiveHelper class (suggestions for name welcome)
> The Zookeeper related code (for service discovery) accesses Zookeeper 
> parameters directly from HiveConf. The class is changed so that it could be 
> used for both HiveServer2 and Metastore server and works with both the 
> configurations. Following methods from HiveServer2 are now moved into 
> ZooKeeperHiveHelper. # startZookeeperClient # addServerInstanceToZooKeeper # 
> removeServerInstanceFromZooKeeper
> h3. HiveMetaStore conf changes
>  # THRIFT_URIS (hive.metastore.uris) can also be used to specify ZooKeeper 
> quorum. When THRIFT_SERVICE_DISCOVERY_MODE 
> (hive.metastore.service.discovery.mode) is set to "zookeeper" the URIs are 
> used as ZooKeeper quorum. When it's set to be empty, the URIs are used to 
> locate the metastore directly.
>  # Here's list of Hiveserver2's parameters and their proposed metastore conf 
> counterparts. It looks odd that the Metastore related configurations do not 
> have their macros start with METASTORE, but start with THRIFT. I have just 
> followed naming convention used for other parameters.
> #* HIVE_SERVER2_ZOOKEEPER_NAMESPACE - THRIFT_ZOOKEEPER_NAMESPACE 
> (hive.metastore.zookeeper.namespace)
> #* HIVE_ZOOKEEPER_CLIENT_PORT - THRIFT_ZOOKEEPER_CLIENT_PORT 
> (hive.metastore.zookeeper.client.port)
> #* HIVE_ZOOKEEPER_CONNECTION_TIMEOUT - THRIFT_ZOOKEEPER_CONNECTION_TIMEOUT - 
> (hive.metastore.zookeeper.connection.timeout)
> #* HIVE_ZOOKEEPER_CONNECTION_MAX_RETRIES - 
> THRIFT_ZOOKEEPER_CONNECTION_MAX_RETRIES 
> (hive.metastore.zookeeper.connection.max.retries)
> #* HIVE_ZOOKEEPER_CONNECTION_BASESLEEPTIME - 
> THRIFT_ZOOKEEPER_CONNECTION_BASESLEEPTIME 
> (hive.metastore.zookeeper.connection.basesleeptime)
> Following Hive ZK configurations seem to be related to managing locks and 
> seem irrelevant for MS ZK.
> # HIVE_ZOOKEEPER_SESSION_TIMEOUT
> # HIVE_ZOOKEEPER_CLEAN_EXTRA_NODES
> Since there is no configuration to be published, 
> HIVE_ZOOKEEPER_PUBLISH_CONFIGS does not have a THRIFT counterpart.
> h3. HiveMetaStore class changes
> # startMetaStore should also register the instance with Zookeeper, when 
> configured.
> # When shutting a metastore server down it should deregister itself from 
> Zookeeper, when configured.
> # These changes use the refactored code described above.
> h3. HiveMetaStoreClient class changes
> When service discovery mode is zookeeper, we fetch the metatstore URIs from 
> the specified ZooKeeper and treat those as if they were specified in 
> THRIFT_URIS i.e. use the existing mechanisms to choose a metastore server to 
> connect to and establish a connection.



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