InternalConstants (Apache Hadoop Amazon Web Services support 3.3.4 API)

java.lang.Object
- org.apache.hadoop.fs.s3a.impl.InternalConstants

```
public final class InternalConstants
extends Object
```
Internal constants private only to the S3A codebase. Please don't refer to these outside of this module & its tests. If you find you need to then either the code is doing something it should not, or these constants need to be uprated to being public and stable entries.

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`AP_INACCESSIBLE` Error message to indicate Access Points are not accessible or don't exist.
`static String`	`AP_REQUIRED_EXCEPTION` Error message to indicate Access Points are required to be used for S3 access.
`static String`	`AP_S3GUARD_INCOMPATIBLE` Error message to indicate Access Points are incompatible with S3Guard.
`static String`	`ARN_BUCKET_OPTION` AccessPoint ARN for the bucket.
`static String`	`AWS_REGION_SYSPROP` The system property used by the AWS SDK to identify the region.
`static int`	`CSE_PADDING_LENGTH` S3 client side encryption adds padding to the content length of constant length of 16 bytes (at the moment, since we have only 1 content encryption algorithm).
`static String`	`CSE_S3GUARD_INCOMPATIBLE` Error message to indicate S3-CSE is incompatible with S3Guard.
`static int`	`DEFAULT_BLOCKSIZE` Default blocksize as used in blocksize and FS status queries: 33554432.
`static int`	`DEFAULT_UPLOAD_PART_COUNT_LIMIT` Maximum entries you can upload in a single file write/copy/upload.
`static boolean`	`DELETE_CONSIDERED_IDEMPOTENT` This declared delete as idempotent.
`static int`	`MAX_ENTRIES_TO_DELETE` The maximum number of entries that can be deleted in any bulk delete call to S3: 1000.
`static int`	`RENAME_PARALLEL_LIMIT` This is an arbitrary value: 10.
`static int`	`SC_403` 403 error code.
`static int`	`SC_404` 404 error code.
`static Set<String>`	`STANDARD_OPENFILE_KEYS` The known keys used in a standard openFile call.
`static String`	`THROTTLE_LOG_NAME` Name of the log for throttling events.
`static String`	`UPLOAD_PART_COUNT_LIMIT` A configuration option for test use only: maximum part count on block writes/uploads.
`static String`	`X_DIRECTORY` Directory marker attribute: see HADOOP-16613.

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DELETE_CONSIDERED_IDEMPOTENT
```
public static final boolean DELETE_CONSIDERED_IDEMPOTENT
```
    This declared delete as idempotent. This is an "interesting" topic in past Hadoop FS work. Essentially: with a single caller, DELETE is idempotent but in a shared filesystem, it is is very much not so. Here, on the basis that isn't a filesystem with consistency guarantees, retryable results in files being deleted.
    
    See Also:
    
    Constant Field Values
  - RENAME_PARALLEL_LIMIT
```
public static final int RENAME_PARALLEL_LIMIT
```
    This is an arbitrary value: 10. It declares how many parallel copy operations in a single rename can be queued before the operation pauses and awaits completion. A very large value wouldn't just starve other threads from performing work, there's a risk that the S3 store itself would throttle operations (which all go to the same shard). It is not currently configurable just to avoid people choosing values which work on a microbenchmark (single rename, no other work, ...) but don't scale well to execution in a large process against a common store, all while separate processes are working with the same shard of storage. It should be a factor of MAX_ENTRIES_TO_DELETE so that all copies will have finished before deletion is contemplated. (There's always a block for that, it just makes more sense to perform the bulk delete after another block of copies have completed).
    
    See Also:
    
    Constant Field Values
  - MAX_ENTRIES_TO_DELETE
```
public static final int MAX_ENTRIES_TO_DELETE
```
    The maximum number of entries that can be deleted in any bulk delete call to S3: 1000.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_BLOCKSIZE
```
public static final int DEFAULT_BLOCKSIZE
```
    Default blocksize as used in blocksize and FS status queries: 33554432.
    
    See Also:
    
    Constant Field Values
  - STANDARD_OPENFILE_KEYS
```
@InterfaceStability.Unstable
public static final Set<String> STANDARD_OPENFILE_KEYS
```
    The known keys used in a standard openFile call. if there's a select marker in there then the keyset used becomes that of the select operation.
  - SC_403
```
public static final int SC_403
```
    403 error code.
    
    See Also:
    
    Constant Field Values
  - SC_404
```
public static final int SC_404
```
    404 error code.
    
    See Also:
    
    Constant Field Values
  - THROTTLE_LOG_NAME
```
public static final String THROTTLE_LOG_NAME
```
    Name of the log for throttling events. Value: "org.apache.hadoop.fs.s3a.throttled".
    
    See Also:
    
    Constant Field Values
  - X_DIRECTORY
```
public static final String X_DIRECTORY
```
    Directory marker attribute: see HADOOP-16613. Value: "application/x-directory".
    
    See Also:
    
    Constant Field Values
  - UPLOAD_PART_COUNT_LIMIT
```
public static final String UPLOAD_PART_COUNT_LIMIT
```
    A configuration option for test use only: maximum part count on block writes/uploads. Value: "fs.s3a.internal.upload.part.count.limit".
    
    See Also:
    
    Constant Field Values
  - DEFAULT_UPLOAD_PART_COUNT_LIMIT
```
public static final int DEFAULT_UPLOAD_PART_COUNT_LIMIT
```
    Maximum entries you can upload in a single file write/copy/upload. Value: 10000.
    
    See Also:
    
    Constant Field Values
  - AWS_REGION_SYSPROP
```
public static final String AWS_REGION_SYSPROP
```
    The system property used by the AWS SDK to identify the region.
    
    See Also:
    
    Constant Field Values
  - CSE_PADDING_LENGTH
```
public static final int CSE_PADDING_LENGTH
```
    S3 client side encryption adds padding to the content length of constant length of 16 bytes (at the moment, since we have only 1 content encryption algorithm). Use this to subtract while listing the content length when certain conditions are met.
    
    See Also:
    
    Constant Field Values
  - CSE_S3GUARD_INCOMPATIBLE
```
public static final String CSE_S3GUARD_INCOMPATIBLE
```
    Error message to indicate S3-CSE is incompatible with S3Guard.
    
    See Also:
    
    Constant Field Values
  - AP_S3GUARD_INCOMPATIBLE
```
public static final String AP_S3GUARD_INCOMPATIBLE
```
    Error message to indicate Access Points are incompatible with S3Guard.
    
    See Also:
    
    Constant Field Values
  - AP_REQUIRED_EXCEPTION
```
public static final String AP_REQUIRED_EXCEPTION
```
    Error message to indicate Access Points are required to be used for S3 access.
    
    See Also:
    
    Constant Field Values
  - AP_INACCESSIBLE
```
public static final String AP_INACCESSIBLE
```
    Error message to indicate Access Points are not accessible or don't exist.
    
    See Also:
    
    Constant Field Values
  - ARN_BUCKET_OPTION
```
public static final String ARN_BUCKET_OPTION
```
    AccessPoint ARN for the bucket. When set as a bucket override the requests for that bucket will go through the AccessPoint.
    
    See Also:
    
    Constant Field Values

Class InternalConstants

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DELETE_CONSIDERED_IDEMPOTENT

RENAME_PARALLEL_LIMIT

MAX_ENTRIES_TO_DELETE

DEFAULT_BLOCKSIZE

STANDARD_OPENFILE_KEYS

SC_403

SC_404

THROTTLE_LOG_NAME

X_DIRECTORY

UPLOAD_PART_COUNT_LIMIT

DEFAULT_UPLOAD_PART_COUNT_LIMIT

AWS_REGION_SYSPROP

CSE_PADDING_LENGTH

CSE_S3GUARD_INCOMPATIBLE

AP_S3GUARD_INCOMPATIBLE

AP_REQUIRED_EXCEPTION

AP_INACCESSIBLE

ARN_BUCKET_OPTION