Constants (Apache Hadoop Amazon Web Services support 3.2.0 API)

java.lang.Object
- org.apache.hadoop.fs.s3a.Constants

```
@InterfaceAudience.Public
 @InterfaceStability.Evolving
public final class Constants
extends Object
```
All the constants used with the S3AFileSystem. Some of the strings are marked as Unstable. This means that they may be unsupported in future; at which point they will be marked as deprecated and simply ignored.

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`ACCESS_KEY`
`static String`	`ASSUMED_ROLE_ARN` AWS Role to request.
`static String`	`ASSUMED_ROLE_CREDENTIALS_DEFAULT`
`static String`	`ASSUMED_ROLE_CREDENTIALS_PROVIDER` list of providers to authenticate for the assumed role.
`static String`	`ASSUMED_ROLE_POLICY` JSON policy containing the policy to apply to the role.
`static String`	`ASSUMED_ROLE_SESSION_DURATION` Duration of assumed roles before a refresh is attempted.
`static String`	`ASSUMED_ROLE_SESSION_DURATION_DEFAULT` Default duration of an assumed role.
`static String`	`ASSUMED_ROLE_SESSION_NAME` Session name for the assumed role, must be valid characters according to the AWS APIs.
`static String`	`ASSUMED_ROLE_STS_ENDPOINT` Security Token Service Endpoint.
`static String`	`ASSUMED_ROLE_STS_ENDPOINT_REGION` Region for the STS endpoint; only relevant if the endpoint is set.
`static String`	`ASSUMED_ROLE_STS_ENDPOINT_REGION_DEFAULT` Default value for the STS endpoint region; needed for v4 signing.
`static String`	`AWS_CREDENTIALS_PROVIDER`
`static String`	`BUFFER_DIR`
`static String`	`CANNED_ACL`
`static String`	`DEFAULT_CANNED_ACL`
`static int`	`DEFAULT_ESTABLISH_TIMEOUT`
`static int`	`DEFAULT_FAST_BUFFER_SIZE`
`static boolean`	`DEFAULT_FAST_UPLOAD` Deprecated.
`static int`	`DEFAULT_FAST_UPLOAD_ACTIVE_BLOCKS` Limit of queued block upload operations before writes block.
`static String`	`DEFAULT_FAST_UPLOAD_BUFFER` Default buffer option: "disk".
`static int`	`DEFAULT_KEEPALIVE_TIME`
`static int`	`DEFAULT_LIST_VERSION`
`static int`	`DEFAULT_MAX_ERROR_RETRIES`
`static int`	`DEFAULT_MAX_PAGING_KEYS`
`static int`	`DEFAULT_MAX_THREADS`
`static int`	`DEFAULT_MAX_TOTAL_TASKS`
`static int`	`DEFAULT_MAXIMUM_CONNECTIONS`
`static boolean`	`DEFAULT_METADATASTORE_AUTHORITATIVE`
`static long`	`DEFAULT_MIN_MULTIPART_THRESHOLD`
`static long`	`DEFAULT_MULTIPART_SIZE`
`static boolean`	`DEFAULT_PURGE_EXISTING_MULTIPART`
`static long`	`DEFAULT_PURGE_EXISTING_MULTIPART_AGE`
`static long`	`DEFAULT_READAHEAD_RANGE`
`static Class<? extends S3ClientFactory>`	`DEFAULT_S3_CLIENT_FACTORY_IMPL`
`static int`	`DEFAULT_S3GUARD_METASTORE_LOCAL_ENTRY_TTL`
`static int`	`DEFAULT_S3GUARD_METASTORE_LOCAL_MAX_RECORDS`
`static boolean`	`DEFAULT_SECURE_CONNECTIONS`
`static int`	`DEFAULT_SOCKET_RECV_BUFFER`
`static int`	`DEFAULT_SOCKET_SEND_BUFFER`
`static int`	`DEFAULT_SOCKET_TIMEOUT`
`static String`	`ENABLE_MULTI_DELETE`
`static String`	`ENDPOINT`
`static String`	`ESTABLISH_TIMEOUT`
`static String`	`ETAG_CHECKSUM_ENABLED` Should etags be exposed as checksums?
`static boolean`	`ETAG_CHECKSUM_ENABLED_DEFAULT` Default value: false.
`static String`	`FAIL_INJECT_CLIENT_FACTORY`
`static String`	`FAIL_INJECT_INCONSISTENCY_KEY` Inconsistency (visibility delay) injection settings.
`static String`	`FAIL_INJECT_INCONSISTENCY_MSEC`
`static String`	`FAIL_INJECT_INCONSISTENCY_PROBABILITY`
`static String`	`FAIL_INJECT_THROTTLE_PROBABILITY`
`static String`	`FAST_BUFFER_SIZE` Deprecated.
`static String`	`FAST_UPLOAD` Deprecated.
`static String`	`FAST_UPLOAD_ACTIVE_BLOCKS` Maximum Number of blocks a single output stream can have active (uploading, or queued to the central FileSystem instance's pool of queued operations.
`static String`	`FAST_UPLOAD_BUFFER` What buffer to use.
`static String`	`FAST_UPLOAD_BUFFER_ARRAY` Use an in-memory array.
`static String`	`FAST_UPLOAD_BUFFER_DISK` Buffer blocks to disk: "disk".
`static String`	`FAST_UPLOAD_BYTEBUFFER` Use a byte buffer.
`static String`	`FS_S3A`
`static String`	`FS_S3A_BLOCK_SIZE`
`static String`	`FS_S3A_BUCKET_PREFIX` Prefix for S3A bucket-specific properties: "fs.s3a.bucket.".
`static String`	`FS_S3A_PREFIX` Prefix for all S3A properties: "fs.s3a.".
`static String`	`HADOOP_TMP_DIR` default hadoop temp dir on local system: "hadoop.tmp.dir".
`static String`	`INPUT_FADV_NORMAL` General input.
`static String`	`INPUT_FADV_RANDOM` Optimized purely for random seek+read/positionedRead operations; The performance of sequential IO may be reduced in exchange for more efficient `seek()` operations.
`static String`	`INPUT_FADV_SEQUENTIAL` Optimized for sequential access.
`static String`	`INPUT_FADVISE` Which input strategy to use for buffering, seeking and similar when reading data.
`static String`	`KEEPALIVE_TIME`
`static String`	`LIST_VERSION` S3 API level parameters.
`static String`	`MAX_ERROR_RETRIES`
`static int`	`MAX_MULTIPART_COUNT` Maximum number of partitions in a multipart upload: 10000.
`static String`	`MAX_PAGING_KEYS`
`static String`	`MAX_THREADS`
`static String`	`MAX_TOTAL_TASKS`
`static String`	`MAXIMUM_CONNECTIONS`
`static String`	`METADATASTORE_AUTHORITATIVE` Whether or not to allow MetadataStore to be source of truth.
`static String`	`MIN_MULTIPART_THRESHOLD`
`static int`	`MULTIPART_MIN_SIZE` The minimum multipart size which S3 supports.
`static String`	`MULTIPART_SIZE`
`static String`	`PATH_STYLE_ACCESS`
`static String`	`PROXY_DOMAIN`
`static String`	`PROXY_HOST`
`static String`	`PROXY_PASSWORD`
`static String`	`PROXY_PORT`
`static String`	`PROXY_USERNAME`
`static String`	`PROXY_WORKSTATION`
`static String`	`PURGE_EXISTING_MULTIPART`
`static String`	`PURGE_EXISTING_MULTIPART_AGE`
`static String`	`READAHEAD_RANGE` read ahead buffer size to prevent connection re-establishments.
`static String`	`RETRY_INTERVAL` Interval between retry attempts.: "fs.s3a.retry.interval".
`static String`	`RETRY_INTERVAL_DEFAULT` Default retry interval: "500ms".
`static String`	`RETRY_LIMIT` Number of times to retry any repeatable S3 client request on failure, excluding throttling requests: "fs.s3a.retry.limit".
`static int`	`RETRY_LIMIT_DEFAULT` Default retry limit: 20.
`static String`	`RETRY_THROTTLE_INTERVAL` Interval between retry attempts on throttled requests: "fs.s3a.retry.throttle.interval".
`static String`	`RETRY_THROTTLE_INTERVAL_DEFAULT` Default throttled retry interval: "500ms".
`static String`	`RETRY_THROTTLE_LIMIT` Number of times to retry any throttled request: "fs.s3a.retry.throttle.limit".
`static int`	`RETRY_THROTTLE_LIMIT_DEFAULT` Default throttled retry limit: 20.
`static String`	`S3_CLIENT_FACTORY_IMPL`
`static String`	`S3_METADATA_STORE_IMPL`
`static int`	`S3A_DEFAULT_PORT`
`static String`	`S3A_SECURITY_CREDENTIAL_PROVIDER_PATH` Extra set of security credentials which will be prepended to that set in `"hadoop.security.credential.provider.path"`.
`static String`	`S3GUARD_CLI_PRUNE_AGE` Minimum period of time (in milliseconds) to keep metadata (may only be applied when a prune command is manually run).
`static int`	`S3GUARD_DDB_BACKGROUND_SLEEP_MSEC_DEFAULT`
`static String`	`S3GUARD_DDB_BACKGROUND_SLEEP_MSEC_KEY` Period of time (in milliseconds) to sleep between batches of writes.
`static int`	`S3GUARD_DDB_BATCH_WRITE_REQUEST_LIMIT` The maximum put or delete requests per BatchWriteItem request.
`static String`	`S3GUARD_DDB_MAX_RETRIES`
`static int`	`S3GUARD_DDB_MAX_RETRIES_DEFAULT` Max retries on batched/throttled DynamoDB operations before giving up and throwing an IOException.
`static String`	`S3GUARD_DDB_REGION_KEY` The region of the DynamoDB service.
`static long`	`S3GUARD_DDB_TABLE_CAPACITY_READ_DEFAULT`
`static String`	`S3GUARD_DDB_TABLE_CAPACITY_READ_KEY`
`static long`	`S3GUARD_DDB_TABLE_CAPACITY_WRITE_DEFAULT`
`static String`	`S3GUARD_DDB_TABLE_CAPACITY_WRITE_KEY`
`static String`	`S3GUARD_DDB_TABLE_CREATE_KEY` Whether to create the DynamoDB table if the table does not exist.
`static String`	`S3GUARD_DDB_TABLE_NAME_KEY` The DynamoDB table name to use.
`static String`	`S3GUARD_DDB_TABLE_TAG` A prefix for adding tags to the DDB Table upon creation.
`static String`	`S3GUARD_DDB_TEST_TABLE_NAME_KEY` Test table name to use during DynamoDB integration test.
`static String`	`S3GUARD_DDB_THROTTLE_RETRY_INTERVAL`
`static String`	`S3GUARD_DDB_THROTTLE_RETRY_INTERVAL_DEFAULT`
`static String`	`S3GUARD_METASTORE_DYNAMO` Use DynamoDB for the metadata: "org.apache.hadoop.fs.s3a.s3guard.DynamoDBMetadataStore".
`static String`	`S3GUARD_METASTORE_LOCAL` Use Local memory for the metadata: "org.apache.hadoop.fs.s3a.s3guard.LocalMetadataStore".
`static String`	`S3GUARD_METASTORE_LOCAL_ENTRY_TTL` Time to live in milliseconds in LocalMetadataStore.
`static String`	`S3GUARD_METASTORE_LOCAL_MAX_RECORDS` Maximum number of records in LocalMetadataStore.
`static String`	`S3GUARD_METASTORE_NULL` The default "Null" metadata store: "org.apache.hadoop.fs.s3a.s3guard.NullMetadataStore".
`static String`	`S3N_FOLDER_SUFFIX`
`static String`	`SECRET_KEY`
`static String`	`SECURE_CONNECTIONS`
`static String`	`SERVER_SIDE_ENCRYPTION_AES256` Deprecated.
`static String`	`SERVER_SIDE_ENCRYPTION_ALGORITHM`
`static String`	`SERVER_SIDE_ENCRYPTION_KEY` Used to specify which AWS KMS key to use if `SERVER_SIDE_ENCRYPTION_ALGORITHM` is `SSE-KMS` (will default to aws/s3 master key if left blank).
`static String`	`SESSION_TOKEN`
`static String`	`SIGNING_ALGORITHM`
`static String`	`SOCKET_RECV_BUFFER`
`static String`	`SOCKET_SEND_BUFFER`
`static String`	`SOCKET_TIMEOUT`
`static String`	`USER_AGENT_PREFIX`

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

- Field Detail
  - HADOOP_TMP_DIR
```
public static final String HADOOP_TMP_DIR
```
    default hadoop temp dir on local system: "hadoop.tmp.dir".
    
    See Also:
    
    Constant Field Values
  - MULTIPART_MIN_SIZE
```
public static final int MULTIPART_MIN_SIZE
```
    The minimum multipart size which S3 supports.
    
    See Also:
    
    Constant Field Values
  - ACCESS_KEY
```
public static final String ACCESS_KEY
```
    See Also:
    
    Constant Field Values
  - SECRET_KEY
```
public static final String SECRET_KEY
```
    See Also:
    
    Constant Field Values
  - AWS_CREDENTIALS_PROVIDER
```
public static final String AWS_CREDENTIALS_PROVIDER
```
    See Also:
    
    Constant Field Values
  - S3A_SECURITY_CREDENTIAL_PROVIDER_PATH
```
public static final String S3A_SECURITY_CREDENTIAL_PROVIDER_PATH
```
    Extra set of security credentials which will be prepended to that set in "hadoop.security.credential.provider.path". This extra option allows for per-bucket overrides.
    
    See Also:
    
    Constant Field Values
  - SESSION_TOKEN
```
public static final String SESSION_TOKEN
```
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_ARN
```
public static final String ASSUMED_ROLE_ARN
```
    AWS Role to request.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_SESSION_NAME
```
public static final String ASSUMED_ROLE_SESSION_NAME
```
    Session name for the assumed role, must be valid characters according to the AWS APIs. If not set, one is generated from the current Hadoop/Kerberos username.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_SESSION_DURATION
```
public static final String ASSUMED_ROLE_SESSION_DURATION
```
    Duration of assumed roles before a refresh is attempted.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_STS_ENDPOINT
```
public static final String ASSUMED_ROLE_STS_ENDPOINT
```
    Security Token Service Endpoint. If unset, uses the default endpoint.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_STS_ENDPOINT_REGION
```
public static final String ASSUMED_ROLE_STS_ENDPOINT_REGION
```
    Region for the STS endpoint; only relevant if the endpoint is set.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_STS_ENDPOINT_REGION_DEFAULT
```
public static final String ASSUMED_ROLE_STS_ENDPOINT_REGION_DEFAULT
```
    Default value for the STS endpoint region; needed for v4 signing.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_SESSION_DURATION_DEFAULT
```
public static final String ASSUMED_ROLE_SESSION_DURATION_DEFAULT
```
    Default duration of an assumed role.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_CREDENTIALS_PROVIDER
```
public static final String ASSUMED_ROLE_CREDENTIALS_PROVIDER
```
    list of providers to authenticate for the assumed role.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_POLICY
```
public static final String ASSUMED_ROLE_POLICY
```
    JSON policy containing the policy to apply to the role.
    
    See Also:
    
    Constant Field Values
  - ASSUMED_ROLE_CREDENTIALS_DEFAULT
```
public static final String ASSUMED_ROLE_CREDENTIALS_DEFAULT
```
    See Also:
    
    Constant Field Values
  - MAXIMUM_CONNECTIONS
```
public static final String MAXIMUM_CONNECTIONS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MAXIMUM_CONNECTIONS
```
public static final int DEFAULT_MAXIMUM_CONNECTIONS
```
    See Also:
    
    Constant Field Values
  - SECURE_CONNECTIONS
```
public static final String SECURE_CONNECTIONS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_SECURE_CONNECTIONS
```
public static final boolean DEFAULT_SECURE_CONNECTIONS
```
    See Also:
    
    Constant Field Values
  - ENDPOINT
```
public static final String ENDPOINT
```
    See Also:
    
    Constant Field Values
  - PATH_STYLE_ACCESS
```
public static final String PATH_STYLE_ACCESS
```
    See Also:
    
    Constant Field Values
  - PROXY_HOST
```
public static final String PROXY_HOST
```
    See Also:
    
    Constant Field Values
  - PROXY_PORT
```
public static final String PROXY_PORT
```
    See Also:
    
    Constant Field Values
  - PROXY_USERNAME
```
public static final String PROXY_USERNAME
```
    See Also:
    
    Constant Field Values
  - PROXY_PASSWORD
```
public static final String PROXY_PASSWORD
```
    See Also:
    
    Constant Field Values
  - PROXY_DOMAIN
```
public static final String PROXY_DOMAIN
```
    See Also:
    
    Constant Field Values
  - PROXY_WORKSTATION
```
public static final String PROXY_WORKSTATION
```
    See Also:
    
    Constant Field Values
  - MAX_ERROR_RETRIES
```
public static final String MAX_ERROR_RETRIES
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MAX_ERROR_RETRIES
```
public static final int DEFAULT_MAX_ERROR_RETRIES
```
    See Also:
    
    Constant Field Values
  - ESTABLISH_TIMEOUT
```
public static final String ESTABLISH_TIMEOUT
```
    See Also:
    
    Constant Field Values
  - DEFAULT_ESTABLISH_TIMEOUT
```
public static final int DEFAULT_ESTABLISH_TIMEOUT
```
    See Also:
    
    Constant Field Values
  - SOCKET_TIMEOUT
```
public static final String SOCKET_TIMEOUT
```
    See Also:
    
    Constant Field Values
  - DEFAULT_SOCKET_TIMEOUT
```
public static final int DEFAULT_SOCKET_TIMEOUT
```
    See Also:
    
    Constant Field Values
  - SOCKET_SEND_BUFFER
```
public static final String SOCKET_SEND_BUFFER
```
    See Also:
    
    Constant Field Values
  - DEFAULT_SOCKET_SEND_BUFFER
```
public static final int DEFAULT_SOCKET_SEND_BUFFER
```
    See Also:
    
    Constant Field Values
  - SOCKET_RECV_BUFFER
```
public static final String SOCKET_RECV_BUFFER
```
    See Also:
    
    Constant Field Values
  - DEFAULT_SOCKET_RECV_BUFFER
```
public static final int DEFAULT_SOCKET_RECV_BUFFER
```
    See Also:
    
    Constant Field Values
  - MAX_PAGING_KEYS
```
public static final String MAX_PAGING_KEYS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MAX_PAGING_KEYS
```
public static final int DEFAULT_MAX_PAGING_KEYS
```
    See Also:
    
    Constant Field Values
  - MAX_THREADS
```
public static final String MAX_THREADS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MAX_THREADS
```
public static final int DEFAULT_MAX_THREADS
```
    See Also:
    
    Constant Field Values
  - KEEPALIVE_TIME
```
public static final String KEEPALIVE_TIME
```
    See Also:
    
    Constant Field Values
  - DEFAULT_KEEPALIVE_TIME
```
public static final int DEFAULT_KEEPALIVE_TIME
```
    See Also:
    
    Constant Field Values
  - MAX_TOTAL_TASKS
```
public static final String MAX_TOTAL_TASKS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MAX_TOTAL_TASKS
```
public static final int DEFAULT_MAX_TOTAL_TASKS
```
    See Also:
    
    Constant Field Values
  - MULTIPART_SIZE
```
public static final String MULTIPART_SIZE
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MULTIPART_SIZE
```
public static final long DEFAULT_MULTIPART_SIZE
```
    See Also:
    
    Constant Field Values
  - MIN_MULTIPART_THRESHOLD
```
public static final String MIN_MULTIPART_THRESHOLD
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MIN_MULTIPART_THRESHOLD
```
public static final long DEFAULT_MIN_MULTIPART_THRESHOLD
```
    See Also:
    
    Constant Field Values
  - ENABLE_MULTI_DELETE
```
public static final String ENABLE_MULTI_DELETE
```
    See Also:
    
    Constant Field Values
  - BUFFER_DIR
```
public static final String BUFFER_DIR
```
    See Also:
    
    Constant Field Values
  - FAST_UPLOAD
```
@Deprecated
public static final String FAST_UPLOAD
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_FAST_UPLOAD
```
@Deprecated
public static final boolean DEFAULT_FAST_UPLOAD
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - FAST_BUFFER_SIZE
```
@Deprecated
public static final String FAST_BUFFER_SIZE
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_FAST_BUFFER_SIZE
```
public static final int DEFAULT_FAST_BUFFER_SIZE
```
    See Also:
    
    Constant Field Values
  - FAST_UPLOAD_BUFFER
```
@InterfaceStability.Unstable
public static final String FAST_UPLOAD_BUFFER
```
    What buffer to use. Default is FAST_UPLOAD_BUFFER_DISK Value: "fs.s3a.fast.upload.buffer"
    
    See Also:
    
    Constant Field Values
  - FAST_UPLOAD_BUFFER_DISK
```
@InterfaceStability.Unstable
public static final String FAST_UPLOAD_BUFFER_DISK
```
    Buffer blocks to disk: "disk". Capacity is limited to available disk space.
    
    See Also:
    
    Constant Field Values
  - FAST_UPLOAD_BUFFER_ARRAY
```
@InterfaceStability.Unstable
public static final String FAST_UPLOAD_BUFFER_ARRAY
```
    Use an in-memory array. Fast but will run of heap rapidly: "array".
    
    See Also:
    
    Constant Field Values
  - FAST_UPLOAD_BYTEBUFFER
```
@InterfaceStability.Unstable
public static final String FAST_UPLOAD_BYTEBUFFER
```
    Use a byte buffer. May be more memory efficient than the FAST_UPLOAD_BUFFER_ARRAY: "bytebuffer".
    
    See Also:
    
    Constant Field Values
  - DEFAULT_FAST_UPLOAD_BUFFER
```
@InterfaceStability.Unstable
public static final String DEFAULT_FAST_UPLOAD_BUFFER
```
    Default buffer option: "disk".
    
    See Also:
    
    Constant Field Values
  - FAST_UPLOAD_ACTIVE_BLOCKS
```
@InterfaceStability.Unstable
public static final String FAST_UPLOAD_ACTIVE_BLOCKS
```
    Maximum Number of blocks a single output stream can have active (uploading, or queued to the central FileSystem instance's pool of queued operations. This stops a single stream overloading the shared thread pool. "fs.s3a.fast.upload.active.blocks"
    Default is DEFAULT_FAST_UPLOAD_ACTIVE_BLOCKS
    
    See Also:
    
    Constant Field Values
  - DEFAULT_FAST_UPLOAD_ACTIVE_BLOCKS
```
@InterfaceStability.Unstable
public static final int DEFAULT_FAST_UPLOAD_ACTIVE_BLOCKS
```
    Limit of queued block upload operations before writes block. Value: 4
    
    See Also:
    
    Constant Field Values
  - CANNED_ACL
```
public static final String CANNED_ACL
```
    See Also:
    
    Constant Field Values
  - DEFAULT_CANNED_ACL
```
public static final String DEFAULT_CANNED_ACL
```
    See Also:
    
    Constant Field Values
  - PURGE_EXISTING_MULTIPART
```
public static final String PURGE_EXISTING_MULTIPART
```
    See Also:
    
    Constant Field Values
  - DEFAULT_PURGE_EXISTING_MULTIPART
```
public static final boolean DEFAULT_PURGE_EXISTING_MULTIPART
```
    See Also:
    
    Constant Field Values
  - PURGE_EXISTING_MULTIPART_AGE
```
public static final String PURGE_EXISTING_MULTIPART_AGE
```
    See Also:
    
    Constant Field Values
  - DEFAULT_PURGE_EXISTING_MULTIPART_AGE
```
public static final long DEFAULT_PURGE_EXISTING_MULTIPART_AGE
```
    See Also:
    
    Constant Field Values
  - SERVER_SIDE_ENCRYPTION_ALGORITHM
```
public static final String SERVER_SIDE_ENCRYPTION_ALGORITHM
```
    See Also:
    
    Constant Field Values
  - SERVER_SIDE_ENCRYPTION_AES256
```
@Deprecated
public static final String SERVER_SIDE_ENCRYPTION_AES256
```
    Deprecated.
    
    The standard encryption algorithm AWS supports. Different implementations may support others (or none). Use the S3AEncryptionMethods instead when configuring which Server Side Encryption to use. Value: ""AES256"".
    
    See Also:
    
    Constant Field Values
  - SERVER_SIDE_ENCRYPTION_KEY
```
public static final String SERVER_SIDE_ENCRYPTION_KEY
```
    Used to specify which AWS KMS key to use if SERVER_SIDE_ENCRYPTION_ALGORITHM is SSE-KMS (will default to aws/s3 master key if left blank). With with SSE_C, the base-64 encoded AES 256 key. May be set within a JCEKS file. Value: ""fs.s3a.server-side-encryption.key"".
    
    See Also:
    
    Constant Field Values
  - SIGNING_ALGORITHM
```
public static final String SIGNING_ALGORITHM
```
    See Also:
    
    Constant Field Values
  - S3N_FOLDER_SUFFIX
```
public static final String S3N_FOLDER_SUFFIX
```
    See Also:
    
    Constant Field Values
  - FS_S3A_BLOCK_SIZE
```
public static final String FS_S3A_BLOCK_SIZE
```
    See Also:
    
    Constant Field Values
  - FS_S3A
```
public static final String FS_S3A
```
    See Also:
    
    Constant Field Values
  - FS_S3A_PREFIX
```
public static final String FS_S3A_PREFIX
```
    Prefix for all S3A properties: "fs.s3a.".
    
    See Also:
    
    Constant Field Values
  - FS_S3A_BUCKET_PREFIX
```
public static final String FS_S3A_BUCKET_PREFIX
```
    Prefix for S3A bucket-specific properties: "fs.s3a.bucket.".
    
    See Also:
    
    Constant Field Values
  - S3A_DEFAULT_PORT
```
public static final int S3A_DEFAULT_PORT
```
    See Also:
    
    Constant Field Values
  - USER_AGENT_PREFIX
```
public static final String USER_AGENT_PREFIX
```
    See Also:
    
    Constant Field Values
  - METADATASTORE_AUTHORITATIVE
```
public static final String METADATASTORE_AUTHORITATIVE
```
    Whether or not to allow MetadataStore to be source of truth.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_METADATASTORE_AUTHORITATIVE
```
public static final boolean DEFAULT_METADATASTORE_AUTHORITATIVE
```
    See Also:
    
    Constant Field Values
  - READAHEAD_RANGE
```
public static final String READAHEAD_RANGE
```
    read ahead buffer size to prevent connection re-establishments.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_READAHEAD_RANGE
```
public static final long DEFAULT_READAHEAD_RANGE
```
    See Also:
    
    Constant Field Values
  - INPUT_FADVISE
```
@InterfaceStability.Unstable
public static final String INPUT_FADVISE
```
    Which input strategy to use for buffering, seeking and similar when reading data. Value: "fs.s3a.experimental.input.fadvise"
    
    See Also:
    
    Constant Field Values
  - INPUT_FADV_NORMAL
```
@InterfaceStability.Unstable
public static final String INPUT_FADV_NORMAL
```
    General input. Some seeks, some reads. Value: "normal"
    
    See Also:
    
    Constant Field Values
  - INPUT_FADV_SEQUENTIAL
```
@InterfaceStability.Unstable
public static final String INPUT_FADV_SEQUENTIAL
```
    Optimized for sequential access. Value: "sequential"
    
    See Also:
    
    Constant Field Values
  - INPUT_FADV_RANDOM
```
@InterfaceStability.Unstable
public static final String INPUT_FADV_RANDOM
```
    Optimized purely for random seek+read/positionedRead operations; The performance of sequential IO may be reduced in exchange for more efficient seek() operations. Value: "random"
    
    See Also:
    
    Constant Field Values
  - S3_CLIENT_FACTORY_IMPL
```
@InterfaceAudience.Private
 @InterfaceStability.Unstable
public static final String S3_CLIENT_FACTORY_IMPL
```
    See Also:
    
    Constant Field Values
  - DEFAULT_S3_CLIENT_FACTORY_IMPL
```
@InterfaceAudience.Private
 @InterfaceStability.Unstable
public static final Class<? extends S3ClientFactory> DEFAULT_S3_CLIENT_FACTORY_IMPL
```
  - MAX_MULTIPART_COUNT
```
@InterfaceAudience.Private
public static final int MAX_MULTIPART_COUNT
```
    Maximum number of partitions in a multipart upload: 10000.
    
    See Also:
    
    Constant Field Values
  - S3_METADATA_STORE_IMPL
```
public static final String S3_METADATA_STORE_IMPL
```
    See Also:
    
    Constant Field Values
  - S3GUARD_CLI_PRUNE_AGE
```
@InterfaceStability.Unstable
public static final String S3GUARD_CLI_PRUNE_AGE
```
    Minimum period of time (in milliseconds) to keep metadata (may only be applied when a prune command is manually run).
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_REGION_KEY
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_REGION_KEY
```
    The region of the DynamoDB service. This config has no default value. If the user does not set this, the S3Guard will operate table in the associated S3 bucket region.
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_TABLE_NAME_KEY
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_TABLE_NAME_KEY
```
    The DynamoDB table name to use. This config has no default value. If the user does not set this, the S3Guard implementation will use the respective S3 bucket name.
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_TABLE_TAG
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_TABLE_TAG
```
    A prefix for adding tags to the DDB Table upon creation. For example: fs.s3a.s3guard.ddb.table.tag.mytag
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_TEST_TABLE_NAME_KEY
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_TEST_TABLE_NAME_KEY
```
    Test table name to use during DynamoDB integration test. The table will be modified, and deleted in the end of the tests. If this value is not set, the integration tests that would be destructive won't run.
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_TABLE_CREATE_KEY
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_TABLE_CREATE_KEY
```
    Whether to create the DynamoDB table if the table does not exist.
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_TABLE_CAPACITY_READ_KEY
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_TABLE_CAPACITY_READ_KEY
```
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_TABLE_CAPACITY_READ_DEFAULT
```
public static final long S3GUARD_DDB_TABLE_CAPACITY_READ_DEFAULT
```
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_TABLE_CAPACITY_WRITE_KEY
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_TABLE_CAPACITY_WRITE_KEY
```
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_TABLE_CAPACITY_WRITE_DEFAULT
```
public static final long S3GUARD_DDB_TABLE_CAPACITY_WRITE_DEFAULT
```
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_BATCH_WRITE_REQUEST_LIMIT
```
public static final int S3GUARD_DDB_BATCH_WRITE_REQUEST_LIMIT
```
    The maximum put or delete requests per BatchWriteItem request. Refer to Amazon API reference for this limit.
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_MAX_RETRIES
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_MAX_RETRIES
```
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_MAX_RETRIES_DEFAULT
```
public static final int S3GUARD_DDB_MAX_RETRIES_DEFAULT
```
    Max retries on batched/throttled DynamoDB operations before giving up and throwing an IOException. Default is 20. See core-default.xml for more detail.
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_THROTTLE_RETRY_INTERVAL
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_THROTTLE_RETRY_INTERVAL
```
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_THROTTLE_RETRY_INTERVAL_DEFAULT
```
public static final String S3GUARD_DDB_THROTTLE_RETRY_INTERVAL_DEFAULT
```
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_BACKGROUND_SLEEP_MSEC_KEY
```
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_BACKGROUND_SLEEP_MSEC_KEY
```
    Period of time (in milliseconds) to sleep between batches of writes. Currently only applies to prune operations, as they are naturally a lower priority than other operations.
    
    See Also:
    
    Constant Field Values
  - S3GUARD_DDB_BACKGROUND_SLEEP_MSEC_DEFAULT
```
public static final int S3GUARD_DDB_BACKGROUND_SLEEP_MSEC_DEFAULT
```
    See Also:
    
    Constant Field Values
  - S3GUARD_METASTORE_NULL
```
@InterfaceStability.Unstable
public static final String S3GUARD_METASTORE_NULL
```
    The default "Null" metadata store: "org.apache.hadoop.fs.s3a.s3guard.NullMetadataStore".
    
    See Also:
    
    Constant Field Values
  - S3GUARD_METASTORE_LOCAL
```
@InterfaceStability.Unstable
public static final String S3GUARD_METASTORE_LOCAL
```
    Use Local memory for the metadata: "org.apache.hadoop.fs.s3a.s3guard.LocalMetadataStore". This is not coherent across processes and must be used for testing only.
    
    See Also:
    
    Constant Field Values
  - S3GUARD_METASTORE_LOCAL_MAX_RECORDS
```
@InterfaceStability.Unstable
public static final String S3GUARD_METASTORE_LOCAL_MAX_RECORDS
```
    Maximum number of records in LocalMetadataStore.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_S3GUARD_METASTORE_LOCAL_MAX_RECORDS
```
public static final int DEFAULT_S3GUARD_METASTORE_LOCAL_MAX_RECORDS
```
    See Also:
    
    Constant Field Values
  - S3GUARD_METASTORE_LOCAL_ENTRY_TTL
```
@InterfaceStability.Unstable
public static final String S3GUARD_METASTORE_LOCAL_ENTRY_TTL
```
    Time to live in milliseconds in LocalMetadataStore. If zero, time-based expiration is disabled.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_S3GUARD_METASTORE_LOCAL_ENTRY_TTL
```
public static final int DEFAULT_S3GUARD_METASTORE_LOCAL_ENTRY_TTL
```
    See Also:
    
    Constant Field Values
  - S3GUARD_METASTORE_DYNAMO
```
@InterfaceStability.Unstable
public static final String S3GUARD_METASTORE_DYNAMO
```
    Use DynamoDB for the metadata: "org.apache.hadoop.fs.s3a.s3guard.DynamoDBMetadataStore".
    
    See Also:
    
    Constant Field Values
  - FAIL_INJECT_INCONSISTENCY_KEY
```
@InterfaceStability.Unstable
public static final String FAIL_INJECT_INCONSISTENCY_KEY
```
    Inconsistency (visibility delay) injection settings.
    
    See Also:
    
    Constant Field Values
  - FAIL_INJECT_INCONSISTENCY_MSEC
```
@InterfaceStability.Unstable
public static final String FAIL_INJECT_INCONSISTENCY_MSEC
```
    See Also:
    
    Constant Field Values
  - FAIL_INJECT_INCONSISTENCY_PROBABILITY
```
@InterfaceStability.Unstable
public static final String FAIL_INJECT_INCONSISTENCY_PROBABILITY
```
    See Also:
    
    Constant Field Values
  - LIST_VERSION
```
@InterfaceStability.Unstable
public static final String LIST_VERSION
```
    S3 API level parameters.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_LIST_VERSION
```
@InterfaceStability.Unstable
public static final int DEFAULT_LIST_VERSION
```
    See Also:
    
    Constant Field Values
  - FAIL_INJECT_THROTTLE_PROBABILITY
```
@InterfaceStability.Unstable
public static final String FAIL_INJECT_THROTTLE_PROBABILITY
```
    See Also:
    
    Constant Field Values
  - FAIL_INJECT_CLIENT_FACTORY
```
@InterfaceStability.Unstable
public static final String FAIL_INJECT_CLIENT_FACTORY
```
    See Also:
    
    Constant Field Values
  - RETRY_LIMIT
```
public static final String RETRY_LIMIT
```
    Number of times to retry any repeatable S3 client request on failure, excluding throttling requests: "fs.s3a.retry.limit".
    
    See Also:
    
    Constant Field Values
  - RETRY_LIMIT_DEFAULT
```
public static final int RETRY_LIMIT_DEFAULT
```
    Default retry limit: 20.
    
    See Also:
    
    Constant Field Values
  - RETRY_INTERVAL
```
public static final String RETRY_INTERVAL
```
    Interval between retry attempts.: "fs.s3a.retry.interval".
    
    See Also:
    
    Constant Field Values
  - RETRY_INTERVAL_DEFAULT
```
public static final String RETRY_INTERVAL_DEFAULT
```
    Default retry interval: "500ms".
    
    See Also:
    
    Constant Field Values
  - RETRY_THROTTLE_LIMIT
```
public static final String RETRY_THROTTLE_LIMIT
```
    Number of times to retry any throttled request: "fs.s3a.retry.throttle.limit".
    
    See Also:
    
    Constant Field Values
  - RETRY_THROTTLE_LIMIT_DEFAULT
```
public static final int RETRY_THROTTLE_LIMIT_DEFAULT
```
    Default throttled retry limit: 20.
    
    See Also:
    
    Constant Field Values
  - RETRY_THROTTLE_INTERVAL
```
public static final String RETRY_THROTTLE_INTERVAL
```
    Interval between retry attempts on throttled requests: "fs.s3a.retry.throttle.interval".
    
    See Also:
    
    Constant Field Values
  - RETRY_THROTTLE_INTERVAL_DEFAULT
```
public static final String RETRY_THROTTLE_INTERVAL_DEFAULT
```
    Default throttled retry interval: "500ms".
    
    See Also:
    
    Constant Field Values
  - ETAG_CHECKSUM_ENABLED
```
public static final String ETAG_CHECKSUM_ENABLED
```
    Should etags be exposed as checksums?
    
    See Also:
    
    Constant Field Values
  - ETAG_CHECKSUM_ENABLED_DEFAULT
```
public static final boolean ETAG_CHECKSUM_ENABLED_DEFAULT
```
    Default value: false.
    
    See Also:
    
    Constant Field Values

Class Constants

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

HADOOP_TMP_DIR

MULTIPART_MIN_SIZE

ACCESS_KEY

SECRET_KEY

AWS_CREDENTIALS_PROVIDER

S3A_SECURITY_CREDENTIAL_PROVIDER_PATH

SESSION_TOKEN

ASSUMED_ROLE_ARN

ASSUMED_ROLE_SESSION_NAME

ASSUMED_ROLE_SESSION_DURATION

ASSUMED_ROLE_STS_ENDPOINT

ASSUMED_ROLE_STS_ENDPOINT_REGION

ASSUMED_ROLE_STS_ENDPOINT_REGION_DEFAULT

ASSUMED_ROLE_SESSION_DURATION_DEFAULT

ASSUMED_ROLE_CREDENTIALS_PROVIDER

ASSUMED_ROLE_POLICY

ASSUMED_ROLE_CREDENTIALS_DEFAULT

MAXIMUM_CONNECTIONS

DEFAULT_MAXIMUM_CONNECTIONS

SECURE_CONNECTIONS

DEFAULT_SECURE_CONNECTIONS

ENDPOINT

PATH_STYLE_ACCESS

PROXY_HOST

PROXY_PORT

PROXY_USERNAME

PROXY_PASSWORD

PROXY_DOMAIN

PROXY_WORKSTATION

MAX_ERROR_RETRIES

DEFAULT_MAX_ERROR_RETRIES

ESTABLISH_TIMEOUT

DEFAULT_ESTABLISH_TIMEOUT

SOCKET_TIMEOUT

DEFAULT_SOCKET_TIMEOUT

SOCKET_SEND_BUFFER

DEFAULT_SOCKET_SEND_BUFFER

SOCKET_RECV_BUFFER

DEFAULT_SOCKET_RECV_BUFFER

MAX_PAGING_KEYS

DEFAULT_MAX_PAGING_KEYS

MAX_THREADS

DEFAULT_MAX_THREADS

KEEPALIVE_TIME

DEFAULT_KEEPALIVE_TIME

MAX_TOTAL_TASKS

DEFAULT_MAX_TOTAL_TASKS

MULTIPART_SIZE

DEFAULT_MULTIPART_SIZE

MIN_MULTIPART_THRESHOLD

DEFAULT_MIN_MULTIPART_THRESHOLD

ENABLE_MULTI_DELETE

BUFFER_DIR

FAST_UPLOAD

DEFAULT_FAST_UPLOAD

FAST_BUFFER_SIZE

DEFAULT_FAST_BUFFER_SIZE

FAST_UPLOAD_BUFFER

FAST_UPLOAD_BUFFER_DISK

FAST_UPLOAD_BUFFER_ARRAY

FAST_UPLOAD_BYTEBUFFER

DEFAULT_FAST_UPLOAD_BUFFER

FAST_UPLOAD_ACTIVE_BLOCKS

DEFAULT_FAST_UPLOAD_ACTIVE_BLOCKS

CANNED_ACL

DEFAULT_CANNED_ACL

PURGE_EXISTING_MULTIPART

DEFAULT_PURGE_EXISTING_MULTIPART

PURGE_EXISTING_MULTIPART_AGE

DEFAULT_PURGE_EXISTING_MULTIPART_AGE

SERVER_SIDE_ENCRYPTION_ALGORITHM

SERVER_SIDE_ENCRYPTION_AES256

SERVER_SIDE_ENCRYPTION_KEY

SIGNING_ALGORITHM

S3N_FOLDER_SUFFIX