[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[ https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16379511#comment-16379511 ] Jesus Camacho Rodriguez commented on HIVE-18776: I have pushed this fix to master, as it will fix the race condition that [~alangates] identified. TestNegativeCliDriver does not seem to be related as it has been timing out consistently for other patches too. > MaterializationsInvalidationCache loading causes race condition in the > metastore > > > Key: HIVE-18776 > URL: https://issues.apache.org/jira/browse/HIVE-18776 > Project: Hive > Issue Type: Bug > Components: Materialized views, Metastore >Affects Versions: 3.0.0 >Reporter: Alan Gates >Assignee: Jesus Camacho Rodriguez >Priority: Major > Fix For: 3.0.0 > > Attachments: HIVE-18776.01.patch, HIVE-18776.02.patch, > HIVE-18776.patch > > > I am seeing occasional failures running metastore tests where operations are > failing saying that there is no open transaction. I have traced this to a > race condition in loading the materialized view invalidation cache. When it > is initialized (either in HiveMetaStoreClient in embedded mode or in > HiveMetaStore in remote mode) it grabs a copy of the current RawStore > instance and then loads the cache in a separate thread. But ObjectStore > keeps state regarding JDO transactions with the underlying RDBMS. So with > the loader thread and the initial thread both doing operations against the > RawStore they sometimes mess up each others transaction stack. In a quick > test I used HMSHandler.newRawStoreForConf() to fix this, which seemed to work. > A reference to the TxnHandler is also called. I suspect this will run into a > similar issue. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[ https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16379491#comment-16379491 ] Jesus Camacho Rodriguez commented on HIVE-18776: I take it back, not sure if it is related, as it is failing for other patches too. > MaterializationsInvalidationCache loading causes race condition in the > metastore > > > Key: HIVE-18776 > URL: https://issues.apache.org/jira/browse/HIVE-18776 > Project: Hive > Issue Type: Bug > Components: Materialized views, Metastore >Affects Versions: 3.0.0 >Reporter: Alan Gates >Assignee: Jesus Camacho Rodriguez >Priority: Major > Attachments: HIVE-18776.01.patch, HIVE-18776.02.patch, > HIVE-18776.patch > > > I am seeing occasional failures running metastore tests where operations are > failing saying that there is no open transaction. I have traced this to a > race condition in loading the materialized view invalidation cache. When it > is initialized (either in HiveMetaStoreClient in embedded mode or in > HiveMetaStore in remote mode) it grabs a copy of the current RawStore > instance and then loads the cache in a separate thread. But ObjectStore > keeps state regarding JDO transactions with the underlying RDBMS. So with > the loader thread and the initial thread both doing operations against the > RawStore they sometimes mess up each others transaction stack. In a quick > test I used HMSHandler.newRawStoreForConf() to fix this, which seemed to work. > A reference to the TxnHandler is also called. I suspect this will run into a > similar issue. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[ https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16379486#comment-16379486 ] Jesus Camacho Rodriguez commented on HIVE-18776: [~alangates], though I cannot repro locally, there seems to be some race condition with TestNegativeCliDriver still, as it timed out in all runs with the patch. I need to explore further before pushing it. > MaterializationsInvalidationCache loading causes race condition in the > metastore > > > Key: HIVE-18776 > URL: https://issues.apache.org/jira/browse/HIVE-18776 > Project: Hive > Issue Type: Bug > Components: Materialized views, Metastore >Affects Versions: 3.0.0 >Reporter: Alan Gates >Assignee: Jesus Camacho Rodriguez >Priority: Major > Attachments: HIVE-18776.01.patch, HIVE-18776.02.patch, > HIVE-18776.patch > > > I am seeing occasional failures running metastore tests where operations are > failing saying that there is no open transaction. I have traced this to a > race condition in loading the materialized view invalidation cache. When it > is initialized (either in HiveMetaStoreClient in embedded mode or in > HiveMetaStore in remote mode) it grabs a copy of the current RawStore > instance and then loads the cache in a separate thread. But ObjectStore > keeps state regarding JDO transactions with the underlying RDBMS. So with > the loader thread and the initial thread both doing operations against the > RawStore they sometimes mess up each others transaction stack. In a quick > test I used HMSHandler.newRawStoreForConf() to fix this, which seemed to work. > A reference to the TxnHandler is also called. I suspect this will run into a > similar issue. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[
https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16379471#comment-16379471
]
Hive QA commented on HIVE-18776:
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12912314/HIVE-18776.02.patch
{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.
{color:red}ERROR:{color} -1 due to 29 failed/errored test(s), 13016 tests
executed
*Failed tests:*
{noformat}
TestNegativeCliDriver - did not produce a TEST-*.xml file (likely timed out)
(batchId=93)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[
https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16379391#comment-16379391
]
Hive QA commented on HIVE-18776:
| (x) *{color:red}-1 overall{color}* |
\\
\\
|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
1s{color} | {color:blue} Findbugs executables are not available. {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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m
4s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
37s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
20s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
49s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
44s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
36s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
36s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
20s{color} | {color:green} standalone-metastore: The patch generated 0 new +
546 unchanged - 1 fixed = 546 total (was 547) {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} javadoc {color} | {color:green} 0m
49s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 0m
12s{color} | {color:red} The patch generated 49 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 11m 51s{color} |
{color:black} {color} |
\\
\\
|| 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-9392/dev-support/hive-personality.sh
|
| git revision | master / 388945f |
| Default Java | 1.8.0_111 |
| asflicense |
http://104.198.109.242/logs//PreCommit-HIVE-Build-9392/yetus/patch-asflicense-problems.txt
|
| modules | C: standalone-metastore U: standalone-metastore |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-9392/yetus.txt |
| Powered by | Apache Yetushttp://yetus.apache.org |
This message was automatically generated.
> MaterializationsInvalidationCache loading causes race condition in the
> metastore
>
>
> Key: HIVE-18776
> URL: https://issues.apache.org/jira/browse/HIVE-18776
> Project: Hive
> Issue Type: Bug
> Components: Materialized views, Metastore
>Affects Versions: 3.0.0
>Reporter: Alan Gates
>Assignee: Jesus Camacho Rodriguez
>Priority: Major
> Attachments: HIVE-18776.01.patch, HIVE-18776.02.patch,
> HIVE-18776.patch
>
>
> I am seeing occasional failures running metastore tests where operations are
> failing saying that there is no open transaction. I have traced this to a
> race condition in loading the materialized view invalidation cache. When it
> is initialized (either in HiveMetaStoreClient in embedded mode or in
> HiveMetaStore in remote mode) it grabs a copy of the current RawStore
> instance and then loads the cache in a separate thread. But ObjectStore
> keeps state regarding JDO transactions with the underlying RDBMS. So with
> the loader thread and the initial thread both doing operations against the
> RawStore they sometimes mess up each others transaction stack. In a quick
> test I used HMSHandler.newRawStoreForConf() to fix this, which seemed to work.
> A reference to the TxnHandler is also called. I suspect this will run into a
> similar issue.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[ https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16379147#comment-16379147 ] Jesus Camacho Rodriguez commented on HIVE-18776: Thanks [~alangates], I am running ptests again. > MaterializationsInvalidationCache loading causes race condition in the > metastore > > > Key: HIVE-18776 > URL: https://issues.apache.org/jira/browse/HIVE-18776 > Project: Hive > Issue Type: Bug > Components: Materialized views, Metastore >Affects Versions: 3.0.0 >Reporter: Alan Gates >Assignee: Jesus Camacho Rodriguez >Priority: Major > Attachments: HIVE-18776.01.patch, HIVE-18776.02.patch, > HIVE-18776.patch > > > I am seeing occasional failures running metastore tests where operations are > failing saying that there is no open transaction. I have traced this to a > race condition in loading the materialized view invalidation cache. When it > is initialized (either in HiveMetaStoreClient in embedded mode or in > HiveMetaStore in remote mode) it grabs a copy of the current RawStore > instance and then loads the cache in a separate thread. But ObjectStore > keeps state regarding JDO transactions with the underlying RDBMS. So with > the loader thread and the initial thread both doing operations against the > RawStore they sometimes mess up each others transaction stack. In a quick > test I used HMSHandler.newRawStoreForConf() to fix this, which seemed to work. > A reference to the TxnHandler is also called. I suspect this will run into a > similar issue. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[ https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16377821#comment-16377821 ] Alan Gates commented on HIVE-18776: --- +1. I ran the test that I used to find this successfully 15 times with the new patch. Previously it failed at least once every 5 runs. > MaterializationsInvalidationCache loading causes race condition in the > metastore > > > Key: HIVE-18776 > URL: https://issues.apache.org/jira/browse/HIVE-18776 > Project: Hive > Issue Type: Bug > Components: Materialized views, Metastore >Affects Versions: 3.0.0 >Reporter: Alan Gates >Assignee: Jesus Camacho Rodriguez >Priority: Major > Attachments: HIVE-18776.01.patch, HIVE-18776.patch > > > I am seeing occasional failures running metastore tests where operations are > failing saying that there is no open transaction. I have traced this to a > race condition in loading the materialized view invalidation cache. When it > is initialized (either in HiveMetaStoreClient in embedded mode or in > HiveMetaStore in remote mode) it grabs a copy of the current RawStore > instance and then loads the cache in a separate thread. But ObjectStore > keeps state regarding JDO transactions with the underlying RDBMS. So with > the loader thread and the initial thread both doing operations against the > RawStore they sometimes mess up each others transaction stack. In a quick > test I used HMSHandler.newRawStoreForConf() to fix this, which seemed to work. > A reference to the TxnHandler is also called. I suspect this will run into a > similar issue. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[
https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16375509#comment-16375509
]
Hive QA commented on HIVE-18776:
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12911844/HIVE-18776.01.patch
{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.
{color:red}ERROR:{color} -1 due to 35 failed/errored test(s), 13009 tests
executed
*Failed tests:*
{noformat}
TestJdbcWithMiniKdc - did not produce a TEST-*.xml file (likely timed out)
(batchId=249)
TestNegativeCliDriver - did not produce a TEST-*.xml file (likely timed out)
(batchId=93)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[
https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16375474#comment-16375474
]
Hive QA commented on HIVE-18776:
| (x) *{color:red}-1 overall{color}* |
\\
\\
|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
0s{color} | {color:blue} Findbugs executables are not available. {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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m
57s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
36s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
20s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
44s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
43s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
36s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
36s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
18s{color} | {color:green} standalone-metastore: The patch generated 0 new +
546 unchanged - 1 fixed = 546 total (was 547) {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} javadoc {color} | {color:green} 0m
45s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 0m
12s{color} | {color:red} The patch generated 49 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 11m 28s{color} |
{color:black} {color} |
\\
\\
|| 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-9348/dev-support/hive-personality.sh
|
| git revision | master / 53a590b |
| Default Java | 1.8.0_111 |
| asflicense |
http://104.198.109.242/logs//PreCommit-HIVE-Build-9348/yetus/patch-asflicense-problems.txt
|
| modules | C: standalone-metastore U: standalone-metastore |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-9348/yetus.txt |
| Powered by | Apache Yetushttp://yetus.apache.org |
This message was automatically generated.
> MaterializationsInvalidationCache loading causes race condition in the
> metastore
>
>
> Key: HIVE-18776
> URL: https://issues.apache.org/jira/browse/HIVE-18776
> Project: Hive
> Issue Type: Bug
> Components: Materialized views, Metastore
>Affects Versions: 3.0.0
>Reporter: Alan Gates
>Assignee: Jesus Camacho Rodriguez
>Priority: Major
> Attachments: HIVE-18776.01.patch, HIVE-18776.patch
>
>
> I am seeing occasional failures running metastore tests where operations are
> failing saying that there is no open transaction. I have traced this to a
> race condition in loading the materialized view invalidation cache. When it
> is initialized (either in HiveMetaStoreClient in embedded mode or in
> HiveMetaStore in remote mode) it grabs a copy of the current RawStore
> instance and then loads the cache in a separate thread. But ObjectStore
> keeps state regarding JDO transactions with the underlying RDBMS. So with
> the loader thread and the initial thread both doing operations against the
> RawStore they sometimes mess up each others transaction stack. In a quick
> test I used HMSHandler.newRawStoreForConf() to fix this, which seemed to work.
> A reference to the TxnHandler is also called. I suspect this will run into a
> similar issue.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[
https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16375034#comment-16375034
]
Hive QA commented on HIVE-18776:
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12911774/HIVE-18776.patch
{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.
{color:red}ERROR:{color} -1 due to 88 failed/errored test(s), 13414 tests
executed
*Failed tests:*
{noformat}
TestNegativeCliDriver - did not produce a TEST-*.xml file (likely timed out)
(batchId=94)
[jira] [Commented] (HIVE-18776) MaterializationsInvalidationCache loading causes race condition in the metastore
[
https://issues.apache.org/jira/browse/HIVE-18776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16374978#comment-16374978
]
Hive QA commented on HIVE-18776:
| (x) *{color:red}-1 overall{color}* |
\\
\\
|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
0s{color} | {color:blue} Findbugs executables are not available. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
1s{color} | {color:green} The patch does not contain any @author tags. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m
28s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
39s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
22s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
48s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
44s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
37s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
37s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m
19s{color} | {color:red} standalone-metastore: The patch generated 2 new + 546
unchanged - 1 fixed = 548 total (was 547) {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} javadoc {color} | {color:green} 0m
45s{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 49 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 12m 14s{color} |
{color:black} {color} |
\\
\\
|| 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-9338/dev-support/hive-personality.sh
|
| git revision | master / ed487ac |
| Default Java | 1.8.0_111 |
| checkstyle |
http://104.198.109.242/logs//PreCommit-HIVE-Build-9338/yetus/diff-checkstyle-standalone-metastore.txt
|
| asflicense |
http://104.198.109.242/logs//PreCommit-HIVE-Build-9338/yetus/patch-asflicense-problems.txt
|
| modules | C: standalone-metastore U: standalone-metastore |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-9338/yetus.txt |
| Powered by | Apache Yetushttp://yetus.apache.org |
This message was automatically generated.
> MaterializationsInvalidationCache loading causes race condition in the
> metastore
>
>
> Key: HIVE-18776
> URL: https://issues.apache.org/jira/browse/HIVE-18776
> Project: Hive
> Issue Type: Bug
> Components: Materialized views, Metastore
>Affects Versions: 3.0.0
>Reporter: Alan Gates
>Assignee: Jesus Camacho Rodriguez
>Priority: Major
> Attachments: HIVE-18776.patch
>
>
> I am seeing occasional failures running metastore tests where operations are
> failing saying that there is no open transaction. I have traced this to a
> race condition in loading the materialized view invalidation cache. When it
> is initialized (either in HiveMetaStoreClient in embedded mode or in
> HiveMetaStore in remote mode) it grabs a copy of the current RawStore
> instance and then loads the cache in a separate thread. But ObjectStore
> keeps state regarding JDO transactions with the underlying RDBMS. So with
> the loader thread and the initial thread both doing operations against the
> RawStore they sometimes mess up each others transaction stack. In a quick
> test I used HMSHandler.newRawStoreForConf() to fix this, which seemed to work.
> A reference to the TxnHandler is also called. I suspect this will run into a
> similar issue.
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