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https://issues.apache.org/jira/browse/HIVE-29137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhaolong updated HIVE-29137:
----------------------------
Attachment: image-2025-08-11-19-58-36-722.png
> Write orc map type very slow
> ----------------------------
>
> Key: HIVE-29137
> URL: https://issues.apache.org/jira/browse/HIVE-29137
> Project: Hive
> Issue Type: Bug
> Affects Versions: 3.1.0, 4.1.0, 4.0.1
> Reporter: zhaolong
> Priority: Major
> Attachments: image-2025-08-11-19-58-36-722.png
>
>
> I find that when the map field data is complex, writing the map field data of
> the orc type is very slow, but parquet's is very fast.
>
> jstack:
> "main" #1 prio=5 os_prio=0 tid=0x00007f8e3c065000 nid=0x1197 runnable
> [0x00007f8e44285000]
> java.lang.Thread.State: RUNNABLE
> at
> org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector.ensureSize(BytesColumnVector.java:544)
> at
> org.apache.hadoop.hive.ql.io.orc.WriterImpl.setColumn(WriterImpl.java:279)
> at
> org.apache.hadoop.hive.ql.io.orc.WriterImpl.setColumn(WriterImpl.java:285)
> at
> org.apache.hadoop.hive.ql.io.orc.WriterImpl.addRow(WriterImpl.java:311)
> at
> org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat$OrcRecordWriter.write(OrcOutputFormat.java:96)
> at
> org.apache.hadoop.hive.ql.exec.FileSinkOperator.process(FileSinkOperator.java:1184)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:888)
> at
> org.apache.hadoop.hive.ql.exec.SelectOperator.process(SelectOperator.java:94)
> at
> org.apache.hadoop.hive.ql.exec.mr.ExecReducer.reduce(ExecReducer.java:214)
> at
> org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:445)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:393)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:178)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1899)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:172)
>
>
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