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Posted to issues@hive.apache.org by "Hive QA (Jira)" <ji...@apache.org> on 2019/11/15 05:19:00 UTC
[jira] [Commented] (HIVE-21917) COMPLETED_TXN_COMPONENTS table is
never cleaned up unless Compactor runs
[ https://issues.apache.org/jira/browse/HIVE-21917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974805#comment-16974805 ]
Hive QA commented on HIVE-21917:
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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 1s{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} 1m 53s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m 24s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 38s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m 11s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 1m 12s{color} | {color:blue} standalone-metastore/metastore-server in master has 178 extant Findbugs warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 4m 18s{color} | {color:blue} ql in master has 1544 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 27s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 26s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m 4s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m 39s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m 25s{color} | {color:red} standalone-metastore/metastore-server: The patch generated 20 new + 627 unchanged - 1 fixed = 647 total (was 628) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m 40s{color} | {color:red} ql: The patch generated 1 new + 33 unchanged - 0 fixed = 34 total (was 33) {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 45s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 29s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 16s{color} | {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 33m 38s{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 3.16.43-2+deb8u5 (2017-09-19) x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /data/hiveptest/working/yetus_PreCommit-HIVE-Build-19432/dev-support/hive-personality.sh |
| git revision | master / 078182a |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-19432/yetus/diff-checkstyle-standalone-metastore_metastore-server.txt |
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-19432/yetus/diff-checkstyle-ql.txt |
| modules | C: standalone-metastore/metastore-server ql U: . |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-19432/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> COMPLETED_TXN_COMPONENTS table is never cleaned up unless Compactor runs
> ------------------------------------------------------------------------
>
> Key: HIVE-21917
> URL: https://issues.apache.org/jira/browse/HIVE-21917
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Affects Versions: 3.1.0, 3.1.1
> Reporter: Craig Condit
> Assignee: Denys Kuzmenko
> Priority: Major
> Attachments: HIVE-21917.1.patch
>
>
> The Initiator thread in the metastore repeatedly loops over entries in the COMPLETED_TXN_COMPONENTS table to determine which partitions / tables might need to be compacted. However, entries are never removed from this table except by a completed Compactor run.
> In a cluster where most tables / partitions are write-once read-many, this results in stale entries in this table never being cleaned up. In a small test cluster, we have observed approximately 45k entries in this table (virtually equal to the number of partitions in the cluster) while < 100 of these tables have delta files at all. Since most of the tables will never get enough writes to trigger a compaction (and in fact have only ever been written to once), the initiator thread keeps trying to evaluate them on every loop.
> On this test cluster, it takes approximately 10 minutes to loop through all the entries and results in severe performance degradation on metastore operations. With the default run timing of 5 minutes, the initiator basically never stops running.
> On a production cluster with 2M partitions, this would be a non-starter.
> The initiator thread should proactively remove entries from COMPLETED_TXN_COMPONENTS when it determines that a compaction is not needed, so that they are not evaluated again on the next loop.
>
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