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Posted to common-issues@hadoop.apache.org by "Vineet Singh (JIRA)" <ji...@apache.org> on 2018/02/23 14:16:00 UTC
[jira] [Created] (HADOOP-15260) Hive queries on tez are overwriting
records on azure wasb storage.
Vineet Singh created HADOOP-15260:
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Summary: Hive queries on tez are overwriting records on azure wasb storage.
Key: HADOOP-15260
URL: https://issues.apache.org/jira/browse/HADOOP-15260
Project: Hadoop Common
Issue Type: Bug
Components: fs/azure
Affects Versions: 2.7.3
Environment: This scenario occurs on hdp 2.5(hadoop 2.7.3) hdfs on WASB microsoft Azure platform.
The same query yields proper result on regular hdfs on hdp 2.5(hadoop 2.7.3) on premise cluster.
Reporter: Vineet Singh
Attachments: On Premise Cluster.JPG, azure cloud.JPG, sample_query.txt
When running multiple hive queries on Tez (see example ) the same mapper task number gets overwritten by the next union query. As seen in the azure snapshot the directories /1 ,2 ...,100 get overwritten again and again since the mapper numbers launch write again and again in the same directories.
But in the on premise hadoop cluster version 2.7.3 . The directories are created as 1_copy_0,1_copy_2 and so on. Creating copies does not overwrite the data.
The queries would be usually 600-1000 queries union together.
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