[jira] [Commented] (HIVE-21466) Increase Default Size of SPLIT_MAXSIZE
[ https://issues.apache.org/jira/browse/HIVE-21466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16797136#comment-16797136 ] David Mollitor commented on HIVE-21466: --- For additional context, this is proposed value is still less that what is recommended for HoS. https://cwiki.apache.org/confluence/display/Hive/Hive+on+Spark%3A+Getting+Started {code} mapreduce.input.fileinputformat.split.maxsize=75000 {code} > Increase Default Size of SPLIT_MAXSIZE > -- > > Key: HIVE-21466 > URL: https://issues.apache.org/jira/browse/HIVE-21466 > Project: Hive > Issue Type: Improvement > Components: Configuration >Affects Versions: 4.0.0, 3.2.0 >Reporter: David Mollitor >Assignee: David Mollitor >Priority: Minor > Attachments: HIVE-21466.1.patch, HIVE-21466.2.patch > > > {code:java} > MAPREDMAXSPLITSIZE(FileInputFormat.SPLIT_MAXSIZE, 25600L, "", true), > {code} > [https://github.com/apache/hive/blob/8d4300a02691777fc96f33861ed27e64fed72f2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L682] > This field specifies a maximum size for each MR (maybe other?) splits. > This number should be a multiple of the HDFS Block size. The way that this > maximum is implemented, is that each block is added to the split, and if the > split grows to be larger than the maximum allowed, the split is submitted to > the cluster and a new split is opened. > So, imagine the following scenario: > * HDFS block size of 16 bytes > * Maximum size of 40 bytes > This will produce a split with 3 blocks. (2x16) = 32; another block will be > inserted, (3x16) = 48 bytes in the split. So, while many operators would > assume a split of 2 blocks, the actual is 3 blocks. Setting the maximum split > size to a multiple of the HDFS block size will make this behavior less > confusing. > The current setting is ~256MB and when this was introduced, the default HDFS > block size was 64MB. That is a factor of 4x. However, now HDFS block sizes > are 128MB by default, so I propose setting this to 4x128MB. The larger > splits (fewer tasks) should give a nice performance boost for modern hardware. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-21466) Increase Default Size of SPLIT_MAXSIZE
[ https://issues.apache.org/jira/browse/HIVE-21466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16796843#comment-16796843 ] Hive QA commented on HIVE-21466: Here are the results of testing the latest attachment: https://issues.apache.org/jira/secure/attachment/12963008/HIVE-21466.2.patch {color:red}ERROR:{color} -1 due to no test(s) being added or modified. {color:green}SUCCESS:{color} +1 due to 15832 tests passed Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/16583/testReport Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/16583/console Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-16583/ Messages: {noformat} Executing org.apache.hive.ptest.execution.TestCheckPhase Executing org.apache.hive.ptest.execution.PrepPhase Executing org.apache.hive.ptest.execution.YetusPhase Executing org.apache.hive.ptest.execution.ExecutionPhase Executing org.apache.hive.ptest.execution.ReportingPhase {noformat} This message is automatically generated. ATTACHMENT ID: 12963008 - PreCommit-HIVE-Build > Increase Default Size of SPLIT_MAXSIZE > -- > > Key: HIVE-21466 > URL: https://issues.apache.org/jira/browse/HIVE-21466 > Project: Hive > Issue Type: Improvement > Components: Configuration >Affects Versions: 4.0.0, 3.2.0 >Reporter: David Mollitor >Assignee: David Mollitor >Priority: Minor > Attachments: HIVE-21466.1.patch, HIVE-21466.2.patch > > > {code:java} > MAPREDMAXSPLITSIZE(FileInputFormat.SPLIT_MAXSIZE, 25600L, "", true), > {code} > [https://github.com/apache/hive/blob/8d4300a02691777fc96f33861ed27e64fed72f2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L682] > This field specifies a maximum size for each MR (maybe other?) splits. > This number should be a multiple of the HDFS Block size. The way that this > maximum is implemented, is that each block is added to the split, and if the > split grows to be larger than the maximum allowed, the split is submitted to > the cluster and a new split is opened. > So, imagine the following scenario: > * HDFS block size of 16 bytes > * Maximum size of 40 bytes > This will produce a split with 3 blocks. (2x16) = 32; another block will be > inserted, (3x16) = 48 bytes in the split. So, while many operators would > assume a split of 2 blocks, the actual is 3 blocks. Setting the maximum split > size to a multiple of the HDFS block size will make this behavior less > confusing. > The current setting is ~256MB and when this was introduced, the default HDFS > block size was 64MB. That is a factor of 4x. However, now HDFS block sizes > are 128MB by default, so I propose setting this to 4x128MB. The larger > splits (fewer tasks) should give a nice performance boost for modern hardware. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-21466) Increase Default Size of SPLIT_MAXSIZE
[ https://issues.apache.org/jira/browse/HIVE-21466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16796822#comment-16796822 ] Hive QA commented on HIVE-21466: | (/) *{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:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 1m 43s{color} | {color:blue} Maven dependency ordering for branch {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m 19s{color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 31s{color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 59s{color} | {color:green} master passed {color} | | {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m 37s{color} | {color:blue} common in master has 63 extant Findbugs warnings. {color} | | {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 4m 9s{color} | {color:blue} ql in master has 2255 extant Findbugs warnings. {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 18s{color} | {color:green} master passed {color} | || || || || {color:brown} Patch Compile Tests {color} || | {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 24s{color} | {color:blue} Maven dependency ordering for patch {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 51s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 30s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m 30s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 59s{color} | {color:green} the patch passed {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 10s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 17s{color} | {color:green} the patch passed {color} | || || || || {color:brown} Other Tests {color} || | {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 15s{color} | {color:green} The patch does not generate ASF License warnings. {color} | | {color:black}{color} | {color:black} {color} | {color:black} 29m 46s{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-16583/dev-support/hive-personality.sh | | git revision | master / 230db04 | | Default Java | 1.8.0_111 | | findbugs | v3.0.0 | | modules | C: common ql U: . | | Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-16583/yetus.txt | | Powered by | Apache Yetushttp://yetus.apache.org | This message was automatically generated. > Increase Default Size of SPLIT_MAXSIZE > -- > > Key: HIVE-21466 > URL: https://issues.apache.org/jira/browse/HIVE-21466 > Project: Hive > Issue Type: Improvement > Components: Configuration >Affects Versions: 4.0.0, 3.2.0 >Reporter: David Mollitor >Assignee: David Mollitor >Priority: Minor > Attachments: HIVE-21466.1.patch, HIVE-21466.2.patch > > > {code:java} > MAPREDMAXSPLITSIZE(FileInputFormat.SPLIT_MAXSIZE, 25600L, "", true), > {code} > [https://github.com/apache/hive/blob/8d4300a02691777fc96f33861ed27e64fed72f2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L682] > This field specifies a maximum size for each MR (maybe other?) splits. > This number should be a multiple of the HDFS Block size. The way that this > maximum is implemented, is that each block is added to the split, and if the > split grows to be larger than the maximum allowed, the split is submitted to > the cluster and a new split is opened. > So, imagine the following scenario: > * HDFS block size of 16 bytes > * Maximum size of 40 bytes > This will produce a split with 3 blocks. (2x16) = 32; another block
[jira] [Commented] (HIVE-21466) Increase Default Size of SPLIT_MAXSIZE
[ https://issues.apache.org/jira/browse/HIVE-21466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16795707#comment-16795707 ] Hive QA commented on HIVE-21466: Here are the results of testing the latest attachment: https://issues.apache.org/jira/secure/attachment/12962897/HIVE-21466.1.patch {color:red}ERROR:{color} -1 due to no test(s) being added or modified. {color:red}ERROR:{color} -1 due to 8 failed/errored test(s), 15833 tests executed *Failed tests:* {noformat} org.apache.hadoop.hive.cli.TestNegativeCliDriver.testCliDriver[udaf_invalid_place] (batchId=99) org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query28] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query44] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query8] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[mv_query44] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query28] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query44] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query8] (batchId=275) {noformat} Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/16566/testReport Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/16566/console Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-16566/ Messages: {noformat} Executing org.apache.hive.ptest.execution.TestCheckPhase Executing org.apache.hive.ptest.execution.PrepPhase Executing org.apache.hive.ptest.execution.YetusPhase Executing org.apache.hive.ptest.execution.ExecutionPhase Executing org.apache.hive.ptest.execution.ReportingPhase Tests exited with: TestsFailedException: 8 tests failed {noformat} This message is automatically generated. ATTACHMENT ID: 12962897 - PreCommit-HIVE-Build > Increase Default Size of SPLIT_MAXSIZE > -- > > Key: HIVE-21466 > URL: https://issues.apache.org/jira/browse/HIVE-21466 > Project: Hive > Issue Type: Improvement > Components: Configuration >Affects Versions: 4.0.0, 3.2.0 >Reporter: David Mollitor >Assignee: David Mollitor >Priority: Minor > Attachments: HIVE-21466.1.patch, HIVE-21466.1.patch > > > {code:java} > MAPREDMAXSPLITSIZE(FileInputFormat.SPLIT_MAXSIZE, 25600L, "", true), > {code} > [https://github.com/apache/hive/blob/8d4300a02691777fc96f33861ed27e64fed72f2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L682] > This field specifies a maximum size for each MR (maybe other?) splits. > This number should be a multiple of the HDFS Block size. The way that this > maximum is implemented, is that each block is added to the split, and if the > split grows to be larger than the maximum allowed, the split is submitted to > the cluster and a new split is opened. > So, imagine the following scenario: > * HDFS block size of 16 bytes > * Maximum size of 40 bytes > This will produce a split with 3 blocks. (2x16) = 32; another block will be > inserted, (3x16) = 48 bytes in the split. So, while many operators would > assume a split of 2 blocks, the actual is 3 blocks. Setting the maximum split > size to a multiple of the HDFS block size will make this behavior less > confusing. > The current setting is ~256MB and when this was introduced, the default HDFS > block size was 64MB. That is a factor of 4x. However, now HDFS block sizes > are 128MB by default, so I propose setting this to 4x128MB. The larger > splits (fewer tasks) should give a nice performance boost for modern hardware. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-21466) Increase Default Size of SPLIT_MAXSIZE
[ https://issues.apache.org/jira/browse/HIVE-21466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16795672#comment-16795672 ] Hive QA commented on HIVE-21466: | (/) *{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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m 59s{color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 20s{color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 16s{color} | {color:green} master passed {color} | | {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m 34s{color} | {color:blue} common in master has 63 extant Findbugs warnings. {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 14s{color} | {color:green} master passed {color} | || || || || {color:brown} Patch Compile Tests {color} || | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 19s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 18s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 18s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 16s{color} | {color:green} the patch passed {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} 0m 44s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 14s{color} | {color:green} the patch passed {color} | || || || || {color:brown} Other Tests {color} || | {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 14s{color} | {color:green} The patch does not generate ASF License warnings. {color} | | {color:black}{color} | {color:black} {color} | {color:black} 12m 50s{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-16566/dev-support/hive-personality.sh | | git revision | master / 36bd89d | | Default Java | 1.8.0_111 | | findbugs | v3.0.0 | | modules | C: common U: common | | Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-16566/yetus.txt | | Powered by | Apache Yetushttp://yetus.apache.org | This message was automatically generated. > Increase Default Size of SPLIT_MAXSIZE > -- > > Key: HIVE-21466 > URL: https://issues.apache.org/jira/browse/HIVE-21466 > Project: Hive > Issue Type: Improvement > Components: Configuration >Affects Versions: 4.0.0, 3.2.0 >Reporter: David Mollitor >Assignee: David Mollitor >Priority: Minor > Attachments: HIVE-21466.1.patch, HIVE-21466.1.patch > > > {code:java} > MAPREDMAXSPLITSIZE(FileInputFormat.SPLIT_MAXSIZE, 25600L, "", true), > {code} > [https://github.com/apache/hive/blob/8d4300a02691777fc96f33861ed27e64fed72f2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L682] > This field specifies a maximum size for each MR (maybe other?) splits. > This number should be a multiple of the HDFS Block size. The way that this > maximum is implemented, is that each block is added to the split, and if the > split grows to be larger than the maximum allowed, the split is submitted to > the cluster and a new split is opened. > So, imagine the following scenario: > * HDFS block size of 16 bytes > * Maximum size of 40 bytes > This will produce a split with 3 blocks. (2x16) = 32; another block will be > inserted, (3x16) = 48 bytes in the split. So, while many operators would > assume a split of 2 blocks, the actual is 3 blocks. Setting the maximum split > size to a multiple of the HDFS block size will make this behavior less > confusing. > The current setting is ~256MB and when this was introduced, the default HDFS > block size was 64MB. That is a factor of 4x. However, now HDFS block sizes > are 128MB by default, so I propose
[jira] [Commented] (HIVE-21466) Increase Default Size of SPLIT_MAXSIZE
[ https://issues.apache.org/jira/browse/HIVE-21466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16795423#comment-16795423 ] Hive QA commented on HIVE-21466: Here are the results of testing the latest attachment: https://issues.apache.org/jira/secure/attachment/12962854/HIVE-21466.1.patch {color:red}ERROR:{color} -1 due to no test(s) being added or modified. {color:red}ERROR:{color} -1 due to 8 failed/errored test(s), 15833 tests executed *Failed tests:* {noformat} org.apache.hadoop.hive.cli.TestNegativeCliDriver.testCliDriver[udaf_invalid_place] (batchId=99) org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query28] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query44] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query8] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[mv_query44] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query28] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query44] (batchId=275) org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query8] (batchId=275) {noformat} Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/16561/testReport Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/16561/console Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-16561/ Messages: {noformat} Executing org.apache.hive.ptest.execution.TestCheckPhase Executing org.apache.hive.ptest.execution.PrepPhase Executing org.apache.hive.ptest.execution.YetusPhase Executing org.apache.hive.ptest.execution.ExecutionPhase Executing org.apache.hive.ptest.execution.ReportingPhase Tests exited with: TestsFailedException: 8 tests failed {noformat} This message is automatically generated. ATTACHMENT ID: 12962854 - PreCommit-HIVE-Build > Increase Default Size of SPLIT_MAXSIZE > -- > > Key: HIVE-21466 > URL: https://issues.apache.org/jira/browse/HIVE-21466 > Project: Hive > Issue Type: Improvement > Components: Configuration >Affects Versions: 4.0.0, 3.2.0 >Reporter: David Mollitor >Assignee: David Mollitor >Priority: Minor > Attachments: HIVE-21466.1.patch > > > {code:java} > MAPREDMAXSPLITSIZE(FileInputFormat.SPLIT_MAXSIZE, 25600L, "", true), > {code} > [https://github.com/apache/hive/blob/8d4300a02691777fc96f33861ed27e64fed72f2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L682] > This field specifies a maximum size for each MR (maybe other?) splits. > This number should be a multiple of the HDFS Block size. The way that this > maximum is implemented, is that each block is added to the split, and if the > split grows to be larger than the maximum allowed, the split is submitted to > the cluster and a new split is opened. > So, imagine the following scenario: > * HDFS block size of 16 bytes > * Maximum size of 40 bytes > This will produce a split with 3 blocks. (2x16) = 32; another block will be > inserted, (3x16) = 48 bytes in the split. So, while many operators would > assume a split of 2 blocks, the actual is 3 blocks. Setting the maximum split > size to a multiple of the HDFS block size will make this behavior less > confusing. > The current setting is ~256MB and when this was introduced, the default HDFS > block size was 64MB. That is a factor of 4x. However, now HDFS block sizes > are 128MB by default, so I propose setting this to 4x128MB. The larger > splits (fewer tasks) should give a nice performance boost for modern hardware. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Commented] (HIVE-21466) Increase Default Size of SPLIT_MAXSIZE
[ https://issues.apache.org/jira/browse/HIVE-21466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16795389#comment-16795389 ] Hive QA commented on HIVE-21466: | (/) *{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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m 45s{color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 18s{color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 17s{color} | {color:green} master passed {color} | | {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m 36s{color} | {color:blue} common in master has 63 extant Findbugs warnings. {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 14s{color} | {color:green} master passed {color} | || || || || {color:brown} Patch Compile Tests {color} || | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 19s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 19s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 19s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 15s{color} | {color:green} the patch passed {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} 0m 46s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 15s{color} | {color:green} the patch passed {color} | || || || || {color:brown} Other Tests {color} || | {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 14s{color} | {color:green} The patch does not generate ASF License warnings. {color} | | {color:black}{color} | {color:black} {color} | {color:black} 12m 48s{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-16561/dev-support/hive-personality.sh | | git revision | master / 36bd89d | | Default Java | 1.8.0_111 | | findbugs | v3.0.0 | | modules | C: common U: common | | Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-16561/yetus.txt | | Powered by | Apache Yetushttp://yetus.apache.org | This message was automatically generated. > Increase Default Size of SPLIT_MAXSIZE > -- > > Key: HIVE-21466 > URL: https://issues.apache.org/jira/browse/HIVE-21466 > Project: Hive > Issue Type: Improvement > Components: Configuration >Affects Versions: 4.0.0, 3.2.0 >Reporter: David Mollitor >Assignee: David Mollitor >Priority: Minor > Attachments: HIVE-21466.1.patch > > > {code:java} > MAPREDMAXSPLITSIZE(FileInputFormat.SPLIT_MAXSIZE, 25600L, "", true), > {code} > [https://github.com/apache/hive/blob/8d4300a02691777fc96f33861ed27e64fed72f2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L682] > This field specifies a maximum size for each MR (maybe other?) splits. > This number should be a multiple of the HDFS Block size. The way that this > maximum is implemented, is that each block is added to the split, and if the > split grows to be larger than the maximum allowed, the split is submitted to > the cluster and a new split is opened. > So, imagine the following scenario: > * HDFS block size of 16 bytes > * Maximum size of 40 bytes > This will produce a split with 3 blocks. (2x16) = 32; another block will be > inserted, (3x16) = 48 bytes in the split. So, while many operators would > assume a split of 2 blocks, the actual is 3 blocks. Setting the maximum split > size to a multiple of the HDFS block size will make this behavior less > confusing. > The current setting is ~256MB and when this was introduced, the default HDFS > block size was 64MB. That is a factor of 4x. However, now HDFS block sizes > are 128MB by default, so I propose setting this to