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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17684) HoS memory issues with MapJoinMemoryExhaustionHandler
Date Fri, 21 Sep 2018 21:55:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16624234#comment-16624234
] 

Hive QA commented on HIVE-17684:
--------------------------------

| (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 43s{color} | {color:blue}
Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  8m 11s{color}
| {color:green} master passed {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red}  3m 38s{color} | {color:red}
root in master failed. {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 24s{color}
| {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 32s{color} | {color:blue}
common in master has 65 extant Findbugs warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  4m  9s{color} | {color:blue}
ql in master has 2326 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  8m 22s{color} |
{color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m  8s{color} | {color:blue}
Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  8m 38s{color}
| {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red}  3m 39s{color} | {color:red}
root in the patch failed. {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  3m 39s{color} | {color:red}
root in the patch failed. {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 16s{color} | {color:red}
common: The patch generated 3 new + 424 unchanged - 0 fixed = 427 total (was 424) {color}
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| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 28s{color} | {color:red}
root: The patch generated 3 new + 424 unchanged - 0 fixed = 427 total (was 424) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 38s{color} | {color:red}
ql: The patch generated 5 new + 6 unchanged - 0 fixed = 11 total (was 6) {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}  4m 21s{color} | {color:red}
ql generated 1 new + 2325 unchanged - 1 fixed = 2326 total (was 2326) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  8m 15s{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} 57m 48s{color} | {color:black}
{color} |
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|| Reason || Tests ||
| FindBugs | module:ql |
|  |  Class org.apache.hadoop.hive.ql.exec.HashTableSinkOperator defines non-transient non-serializable
instance field memoryExhaustionChecker  In HashTableSinkOperator.java:instance field memoryExhaustionChecker
 In HashTableSinkOperator.java |
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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-13958/dev-support/hive-personality.sh
|
| git revision | master / f404b0d |
| Default Java | 1.8.0_111 |
| compile | http://104.198.109.242/logs//PreCommit-HIVE-Build-13958/yetus/branch-compile-root.txt
|
| findbugs | v3.0.0 |
| compile | http://104.198.109.242/logs//PreCommit-HIVE-Build-13958/yetus/patch-compile-root.txt
|
| javac | http://104.198.109.242/logs//PreCommit-HIVE-Build-13958/yetus/patch-compile-root.txt
|
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-13958/yetus/diff-checkstyle-common.txt
|
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-13958/yetus/diff-checkstyle-root.txt
|
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-13958/yetus/diff-checkstyle-ql.txt
|
| findbugs | http://104.198.109.242/logs//PreCommit-HIVE-Build-13958/yetus/new-findbugs-ql.html
|
| modules | C: common . ql U: . |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-13958/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> HoS memory issues with MapJoinMemoryExhaustionHandler
> -----------------------------------------------------
>
>                 Key: HIVE-17684
>                 URL: https://issues.apache.org/jira/browse/HIVE-17684
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>            Reporter: Sahil Takiar
>            Assignee: Misha Dmitriev
>            Priority: Major
>         Attachments: HIVE-17684.01.patch, HIVE-17684.02.patch, HIVE-17684.03.patch, HIVE-17684.04.patch,
HIVE-17684.05.patch, HIVE-17684.06.patch, HIVE-17684.07.patch, HIVE-17684.08.patch, HIVE-17684.09.patch,
HIVE-17684.10.patch, HIVE-17684.11.patch
>
>
> We have seen a number of memory issues due the {{HashSinkOperator}} use of the {{MapJoinMemoryExhaustionHandler}}.
This handler is meant to detect scenarios where the small table is taking too much space in
memory, in which case a {{MapJoinMemoryExhaustionError}} is thrown.
> The configs to control this logic are:
> {{hive.mapjoin.localtask.max.memory.usage}} (default 0.90)
> {{hive.mapjoin.followby.gby.localtask.max.memory.usage}} (default 0.55)
> The handler works by using the {{MemoryMXBean}} and uses the following logic to estimate
how much memory the {{HashMap}} is consuming: {{MemoryMXBean#getHeapMemoryUsage().getUsed()
/ MemoryMXBean#getHeapMemoryUsage().getMax()}}
> The issue is that {{MemoryMXBean#getHeapMemoryUsage().getUsed()}} can be inaccurate.
The value returned by this method returns all reachable and unreachable memory on the heap,
so there may be a bunch of garbage data, and the JVM just hasn't taken the time to reclaim
it all. This can lead to intermittent failures of this check even though a simple GC would
have reclaimed enough space for the process to continue working.
> We should re-think the usage of {{MapJoinMemoryExhaustionHandler}} for HoS. In Hive-on-MR
this probably made sense to use because every Hive task was run in a dedicated container,
so a Hive Task could assume it created most of the data on the heap. However, in Hive-on-Spark
there can be multiple Hive Tasks running in a single executor, each doing different things.



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