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Posted to common-issues@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2020/03/26 20:57:00 UTC
[jira] [Resolved] (HADOOP-16942) S3A creating folder level delete
markers
[ https://issues.apache.org/jira/browse/HADOOP-16942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran resolved HADOOP-16942.
-------------------------------------
Fix Version/s: HADOOP-13230
Resolution: Duplicate
Duplicate of HADOOP-13230
Have a look @ the doc there, the big issue is "how do we do this in a way which doesn't break everything else"?
I don' t know what EMR does. Presto makes mkdir() a no-op and for all directory listings, of any path, returns an empty list rather than raising FNFE
> S3A creating folder level delete markers
> ----------------------------------------
>
> Key: HADOOP-16942
> URL: https://issues.apache.org/jira/browse/HADOOP-16942
> Project: Hadoop Common
> Issue Type: Task
> Components: fs/s3
> Affects Versions: 3.2.1
> Reporter: vijayant soni
> Priority: Minor
> Fix For: HADOOP-13230
>
>
> Using S3A URL scheme while writing out data from Spark to S3 is creating many folder level delete markers.
> Writing the same with S3 URL scheme, does not create any delete markers at all.
>
> Spark - 2.4.4
> Hadoop - 3.2.1
> EMR version - 6.0.0
> {code:scala}
> spark-shell
> Welcome to
> ____ __
> / __/__ ___ _____/ /__
> _\ \/ _ \/ _ `/ __/ '_/
> /___/ .__/\_,_/_/ /_/\_\ version 2.4.4
> /_/
>
> Using Scala version 2.12.10 (OpenJDK 64-Bit Server VM, Java 1.8.0_242)
> Type in expressions to have them evaluated.
> Type :help for more information.
> scala> val df = spark.sql("select 1 as a")
> df: org.apache.spark.sql.DataFrame = [a: int]
> scala> df.show(false)
> +---+
> |a |
> +---+
> |1 |
> +---+
> scala> // Writing to S3 using s3
> scala> df.write.mode(org.apache.spark.sql.SaveMode.Overwrite).save("s3://my_bucket/tmp/vijayant/s3/")
>
> scala> // Writing to S3 using s3a
> scala> df.write.mode(org.apache.spark.sql.SaveMode.Overwrite).save("s3a://my_bucket/tmp/vijayant/s3a/")
>
> scala>
> {code}
> Getting delete markers from `s3` write
> {code:bash}
> aws s3api list-object-versions --bucket my_bucket --prefix tmp/vijayant/s3
> {
> "Versions": [
> {
> "LastModified": "2020-03-26T12:57:54.000Z",
> "VersionId": "h7_SIsHYoC.1il2s4qporAFnVbLgiLN5",
> "ETag": "\"d41d8cd98f00b204e9800998ecf8427e\"",
> "StorageClass": "STANDARD",
> "Key": "tmp/vijayant/s3/_SUCCESS",
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "Size": 0
> },
> {
> "LastModified": "2020-03-26T12:57:54.000Z",
> "VersionId": "pOALzyzpBR7glCEk3cqPOR.u8QCIcLnC",
> "ETag": "\"26e70a1e26c709e3e8498acd49cfaaa3-1\"",
> "StorageClass": "STANDARD",
> "Key": "tmp/vijayant/s3/part-00000-9af16781-7944-497d-9b19-f31ab1e5f850-c000.snappy.parquet",
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "Size": 384
> }
> ]
> }
> {code}
> Getting delete markers from `s3a` write
> {code:bash}
> aws s3api list-object-versions --bucket my_bucket --prefix tmp/vijayant/s3a
> {
> "DeleteMarkers": [
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "VersionId": "Jd8PHlUK3TbVJY2RWQxi74a6.2Gp2mUL",
> "Key": "tmp/vijayant/s3a/",
> "LastModified": "2020-03-26T13:00:14.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "j2llpkiXzEaomJr5xLhQ9xTmfoq_8dOy",
> "Key": "tmp/vijayant/s3a/",
> "LastModified": "2020-03-26T13:00:13.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "ry6BqTUGvyY3U.eqFfgg2hJ2BBMxVcwH",
> "Key": "tmp/vijayant/s3a/",
> "LastModified": "2020-03-26T13:00:13.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "xG2oNiCpovqWCSZxaWiqtL.E7znE7AmR",
> "Key": "tmp/vijayant/s3a/",
> "LastModified": "2020-03-26T13:00:12.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "OedjkEU1VeWl0ZZouur.13dufhYa7JXm",
> "Key": "tmp/vijayant/s3a/",
> "LastModified": "2020-03-26T13:00:01.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "VersionId": "Nn8O947GGwqCePelc9VL9O2sWsmSsy2i",
> "Key": "tmp/vijayant/s3a/_temporary/",
> "LastModified": "2020-03-26T13:00:13.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "7DcZ4b3pmoIi_TuzoRsykdtzyUGDLUo9",
> "Key": "tmp/vijayant/s3a/_temporary/",
> "LastModified": "2020-03-26T13:00:12.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "eFahQrYnglWeRHZHTod6IszSoNE3jPCH",
> "Key": "tmp/vijayant/s3a/_temporary/",
> "LastModified": "2020-03-26T13:00:01.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "VersionId": "m4mGr.QA3sO0pQb_tuZEZX6OVIeprgwl",
> "Key": "tmp/vijayant/s3a/_temporary/0/",
> "LastModified": "2020-03-26T13:00:13.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "2TBn8RzdMKzEqn6cP8O_CI9OdZkhvv53",
> "Key": "tmp/vijayant/s3a/_temporary/0/",
> "LastModified": "2020-03-26T13:00:12.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "VersionId": "NXVubIX_eu9RYLDWpD4JH91VK08OmHwu",
> "Key": "tmp/vijayant/s3a/_temporary/0/_temporary/",
> "LastModified": "2020-03-26T13:00:13.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "FtubGslxkfMiT5uxuuEorWsg0OIvXmzY",
> "Key": "tmp/vijayant/s3a/_temporary/0/_temporary/",
> "LastModified": "2020-03-26T13:00:12.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "VersionId": "0tv9I0s1mvurxP4KX_Zgqr7P8OQ5bIs7",
> "Key": "tmp/vijayant/s3a/_temporary/0/_temporary/attempt_20200326130000_0002_m_000000_2/",
> "LastModified": "2020-03-26T13:00:14.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "VersionId": "y058RX4xXC.a_ltup_OxdI7S5o288h38",
> "Key": "tmp/vijayant/s3a/_temporary/0/_temporary/attempt_20200326130000_0002_m_000000_2/",
> "LastModified": "2020-03-26T13:00:12.000Z"
> },
> {
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "VersionId": "T54GB8P1SVmWUu_9lXXogf970cYZOszE",
> "Key": "tmp/vijayant/s3a/_temporary/0/_temporary/attempt_20200326130000_0002_m_000000_2/part-00000-8ecb77ed-8279-4256-9ef1-5ea352318c1a-c000.snappy.parquet",
> "LastModified": "2020-03-26T13:00:13.000Z"
> }
> ],
> "Versions": [
> {
> "LastModified": "2020-03-26T13:00:14.000Z",
> "VersionId": "3HSpCqBQyrVoh9X1tTfskNEiQIet7f_0",
> "ETag": "\"d41d8cd98f00b204e9800998ecf8427e\"",
> "StorageClass": "STANDARD",
> "Key": "tmp/vijayant/s3a/_SUCCESS",
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "Size": 0
> },
> {
> "LastModified": "2020-03-26T13:00:00.000Z",
> "VersionId": "zB.ELKr2RcK9RgdSgx5wwj55YPlZTWD0",
> "ETag": "\"d41d8cd98f00b204e9800998ecf8427e\"",
> "StorageClass": "STANDARD",
> "Key": "tmp/vijayant/s3a/_temporary/0/",
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "Size": 0
> },
> {
> "LastModified": "2020-03-26T13:00:13.000Z",
> "VersionId": "XoIDfWRP0Y6DySn_FVkh3z.LCSCv1H4x",
> "ETag": "\"d41d8cd98f00b204e9800998ecf8427e\"",
> "StorageClass": "STANDARD",
> "Key": "tmp/vijayant/s3a/_temporary/0/_temporary/attempt_20200326130000_0002_m_000000_2/",
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "Size": 0
> },
> {
> "LastModified": "2020-03-26T13:00:12.000Z",
> "VersionId": "OL24nTI4C0DJFur6ZfXeWFH1N_eo.SIl",
> "ETag": "\"1c1179f44b770f1d661f06b9324c27da\"",
> "StorageClass": "STANDARD",
> "Key": "tmp/vijayant/s3a/_temporary/0/_temporary/attempt_20200326130000_0002_m_000000_2/part-00000-8ecb77ed-8279-4256-9ef1-5ea352318c1a-c000.snappy.parquet",
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": false,
> "Size": 384
> },
> {
> "LastModified": "2020-03-26T13:00:13.000Z",
> "VersionId": "EscpHQeMrYBhDGdmnH5TPEDLpLUwZzBS",
> "ETag": "\"1c1179f44b770f1d661f06b9324c27da\"",
> "StorageClass": "STANDARD",
> "Key": "tmp/vijayant/s3a/part-00000-8ecb77ed-8279-4256-9ef1-5ea352318c1a-c000.snappy.parquet",
> "Owner": {
> "DisplayName": "<display-name>",
> "ID": "<owner-id>"
> },
> "IsLatest": true,
> "Size": 384
> }
> ]
> }
> {code}
> This in turn makes listing objects slow and we have even noticed timeouts due to too many delete markers.
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