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Hive QA commented on HIVE-20951: -------------------------------- | (/) *{color:green}+1 overall{color}* | \\ \\ || 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:brown} Patch Compile Tests {color} || | {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 0s{color} | {color:green} The patch has no whitespace issues. {color} | || || || || {color:brown} Other Tests {color} || | {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 31s{color} | {color:green} The patch does not generate ASF License warnings. {color} | | {color:black}{color} | {color:black} {color} | {color:black} 1m 5s{color} | {color:black} {color} | \\ \\ || Subsystem || Report/Notes || | Optional Tests | asflicense | | 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-15104/dev-support/hive-personality.sh | | git revision | master / a070a9d | | modules | C: llap-server U: llap-server | | Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-15104/yetus.txt | | Powered by | Apache Yetus http://yetus.apache.org | This message was automatically generated. > LLAP: Set Xms to 50% always > ---------------------------- > > Key: HIVE-20951 > URL: https://issues.apache.org/jira/browse/HIVE-20951 > Project: Hive > Issue Type: Bug > Components: llap > Affects Versions: 4.0.0, 3.1.1 > Reporter: Gopal V > Assignee: Gopal V > Priority: Major > Attachments: HIVE-20951.1.patch > > > The lack of GC pauses is killing LLAP containers whenever the significant > amount of memory is consumed by the off-heap structures which aren't cleaned > up automatically until the GC runs. > There's a java.nio.DirectByteBuffer.Deallocator which runs when the Direct > buffers are garbage collected, which actually does the cleanup of the > underlying off-heap buffers. > The lack of Garbage collection activity for several hours while responding to > queries triggers a build-up of these off-heap structures which end up forcing > YARN to kill the process instead. > It is better to hit a GC pause occasionally rather than to lose a node every > few hours. -- This message was sent by Atlassian JIRA (v7.6.3#76005)