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HADOOP-19015. Increase fs.s3a.connection.maximum to 500 to minimize risk of Timeout waiting for connection from pool. #6372 #6487

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merged 1 commit into from
Jan 25, 2024
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HADOOP-19015. Increase fs.s3a.connection.maximum to 500 to minimize risk of Timeout waiting for connection from pool. #6372 #6487

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2 changes: 1 addition & 1 deletion hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
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Expand Up @@ -1362,7 +1362,7 @@

<property>
<name>fs.s3a.connection.maximum</name>
<value>96</value>
<value>500</value>
<description>Controls the maximum number of simultaneous connections to S3.
This must be bigger than the value of fs.s3a.threads.max so as to stop
threads being blocked waiting for new HTTPS connections.
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8 changes: 7 additions & 1 deletion hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Constants.java
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Expand Up @@ -152,7 +152,13 @@ private Constants() {

// number of simultaneous connections to s3
public static final String MAXIMUM_CONNECTIONS = "fs.s3a.connection.maximum";
public static final int DEFAULT_MAXIMUM_CONNECTIONS = 96;

/**
* Default value for {@link #MAXIMUM_CONNECTIONS}: {@value}.
* Future releases are likely to increase this value.
* Keep in sync with the value in {@code core-default.xml}
*/
public static final int DEFAULT_MAXIMUM_CONNECTIONS = 500;

/**
* Configuration option to configure expiration time of
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6 changes: 3 additions & 3 deletions hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/performance.md
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Expand Up @@ -211,19 +211,19 @@ for parallel IO (especially uploads) by setting the properties
| property | meaning | default |
|----------|---------|---------|
| `fs.s3a.threads.max`| Threads in the AWS transfer manager| 10 |
| `fs.s3a.connection.maximum`| Maximum number of HTTP connections | 10|
| `fs.s3a.connection.maximum`| Maximum number of HTTP connections | 500 |

We recommend using larger values for processes which perform
a lot of IO: `DistCp`, Spark Workers and similar.

```xml
<property>
<name>fs.s3a.threads.max</name>
<value>20</value>
<value>10</value>
</property>
<property>
<name>fs.s3a.connection.maximum</name>
<value>20</value>
<value>500</value>
</property>
```

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