The loading of parquet files from HDFS is slower that the loading from S3. What can be the reasons for that?
I have hundreds of parquet files in HDFS. I also have the same files in AWS S3. On a EMR cluster, I run a machine learning model, which can take its learning data from HDFS or from S3.
When it loads the data from HDFS, it takes a longer time than when the data is loaded from S3. Should not it be the opposite ? What can be the reason(s) for that?
Obviously, the hardware (the machines) used in the EMR cluster is the same for both cases.
hadoop amazon-s3
asked Nov 14 '18 at 16:52
Benjamin DupuisBenjamin Dupuis
12
add a comment |
I have hundreds of parquet files in HDFS. I also have the same files in AWS S3. On a EMR cluster, I run a machine learning model, which can take its learning data from HDFS or from S3.
When it loads the data from HDFS, it takes a longer time than when the data is loaded from S3. Should not it be the opposite ? What can be the reason(s) for that?
Obviously, the hardware (the machines) used in the EMR cluster is the same for both cases.
hadoop amazon-s3
asked Nov 14 '18 at 16:52
Benjamin DupuisBenjamin Dupuis
12
add a comment |
I have hundreds of parquet files in HDFS. I also have the same files in AWS S3. On a EMR cluster, I run a machine learning model, which can take its learning data from HDFS or from S3.
When it loads the data from HDFS, it takes a longer time than when the data is loaded from S3. Should not it be the opposite ? What can be the reason(s) for that?
Obviously, the hardware (the machines) used in the EMR cluster is the same for both cases.
hadoop amazon-s3
asked Nov 14 '18 at 16:52
Benjamin DupuisBenjamin Dupuis
12
I have hundreds of parquet files in HDFS. I also have the same files in AWS S3. On a EMR cluster, I run a machine learning model, which can take its learning data from HDFS or from S3.
When it loads the data from HDFS, it takes a longer time than when the data is loaded from S3. Should not it be the opposite ? What can be the reason(s) for that?
Obviously, the hardware (the machines) used in the EMR cluster is the same for both cases.
hadoop amazon-s3
hadoop amazon-s3
asked Nov 14 '18 at 16:52
Benjamin DupuisBenjamin Dupuis
12
asked Nov 14 '18 at 16:52
Benjamin DupuisBenjamin Dupuis
12
asked Nov 14 '18 at 16:52
Benjamin DupuisBenjamin Dupuis
12
asked Nov 14 '18 at 16:52
Benjamin DupuisBenjamin Dupuis
12
asked Nov 14 '18 at 16:52
Benjamin DupuisBenjamin Dupuis
12
12
add a comment |
add a comment |
1 Answer
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S3 has problems when you load lots of files
Hadoop has problems when you use lots of small files (less than the 128 MB block size)
Assuming YARN settings are all the same, I would look at the IOPs rate to the HDFS volumes, and ensure your NodeManagers are running on the same machines as Datanodes
answered Nov 15 '18 at 2:49
cricket_007cricket_007
82.4k1143111
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
S3 has problems when you load lots of files
Hadoop has problems when you use lots of small files (less than the 128 MB block size)
Assuming YARN settings are all the same, I would look at the IOPs rate to the HDFS volumes, and ensure your NodeManagers are running on the same machines as Datanodes
answered Nov 15 '18 at 2:49
cricket_007cricket_007
82.4k1143111
add a comment |
S3 has problems when you load lots of files
Hadoop has problems when you use lots of small files (less than the 128 MB block size)
Assuming YARN settings are all the same, I would look at the IOPs rate to the HDFS volumes, and ensure your NodeManagers are running on the same machines as Datanodes
answered Nov 15 '18 at 2:49
cricket_007cricket_007
82.4k1143111
add a comment |
S3 has problems when you load lots of files
Hadoop has problems when you use lots of small files (less than the 128 MB block size)
Assuming YARN settings are all the same, I would look at the IOPs rate to the HDFS volumes, and ensure your NodeManagers are running on the same machines as Datanodes
answered Nov 15 '18 at 2:49
cricket_007cricket_007
82.4k1143111
S3 has problems when you load lots of files
Hadoop has problems when you use lots of small files (less than the 128 MB block size)
Assuming YARN settings are all the same, I would look at the IOPs rate to the HDFS volumes, and ensure your NodeManagers are running on the same machines as Datanodes
answered Nov 15 '18 at 2:49
cricket_007cricket_007
82.4k1143111
answered Nov 15 '18 at 2:49
cricket_007cricket_007
82.4k1143111
answered Nov 15 '18 at 2:49
cricket_007cricket_007
82.4k1143111
answered Nov 15 '18 at 2:49
cricket_007cricket_007
82.4k1143111
82.4k1143111
add a comment |
add a comment |
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