org.apache.iceberg

Interface Snapshot

All Superinterfaces:

java.io.Serializable

public interface Snapshot
extends java.io.Serializable

A snapshot of the data in a table at a point in time.

A snapshot consist of one or more file manifests, and the complete table contents is the union of all the data files in those manifests.

Snapshots are created by table operations, like AppendFiles and RewriteFiles.

Method Summary

Modifier and Type	Method and Description
java.lang.Iterable<DataFile>	addedFiles() Return all files added to the table in this snapshot.
java.util.List<ManifestFile>	allManifests() Return all ManifestFile instances for either data or delete manifests in this snapshot.
java.util.List<ManifestFile>	dataManifests() Return a ManifestFile for each data manifest in this snapshot.
java.lang.Iterable<DataFile>	deletedFiles() Return all files deleted from the table in this snapshot.
java.util.List<ManifestFile>	deleteManifests() Return a ManifestFile for each delete manifest in this snapshot.
java.lang.String	manifestListLocation() Return the location of this snapshot's manifest list, or null if it is not separate.
java.lang.String	operation() Return the name of the data operation that produced this snapshot.
java.lang.Long	parentId() Return this snapshot's parent ID or null.
long	sequenceNumber() Return this snapshot's sequence number.
long	snapshotId() Return this snapshot's ID.
java.util.Map<java.lang.String,java.lang.String>	summary() Return a string map of summary data for the operation that produced this snapshot.
long	timestampMillis() Return this snapshot's timestamp.

Method Detail

sequenceNumber

long sequenceNumber()

Return this snapshot's sequence number.

Sequence numbers are assigned when a snapshot is committed.

Returns:

a long sequence number

snapshotId

long snapshotId()

Return this snapshot's ID.

Returns:

a long ID

parentId

java.lang.Long parentId()

Return this snapshot's parent ID or null.

Returns:

a long ID for this snapshot's parent, or null if it has no parent

timestampMillis

long timestampMillis()

Return this snapshot's timestamp.

This timestamp is the same as those produced by System.currentTimeMillis().

Returns:

a long timestamp in milliseconds

allManifests

java.util.List<ManifestFile> allManifests()

Return all ManifestFile instances for either data or delete manifests in this snapshot.

Returns:

a list of ManifestFile

dataManifests

java.util.List<ManifestFile> dataManifests()

Return a ManifestFile for each data manifest in this snapshot.

Returns:

a list of ManifestFile

deleteManifests

java.util.List<ManifestFile> deleteManifests()

Return a ManifestFile for each delete manifest in this snapshot.

Returns:

a list of ManifestFile

operation

java.lang.String operation()

Return the name of the data operation that produced this snapshot.

Returns:

the operation that produced this snapshot, or null if the operation is unknown

See Also:

DataOperations

summary

java.util.Map<java.lang.String,java.lang.String> summary()

Return a string map of summary data for the operation that produced this snapshot.

Returns:

a string map of summary data.

addedFiles

java.lang.Iterable<DataFile> addedFiles()

Return all files added to the table in this snapshot.

The files returned include the following columns: file_path, file_format, partition, record_count, and file_size_in_bytes. Other columns will be null.

Returns:

all files added to the table in this snapshot.

deletedFiles

java.lang.Iterable<DataFile> deletedFiles()

Return all files deleted from the table in this snapshot.

The files returned include the following columns: file_path, file_format, partition, record_count, and file_size_in_bytes. Other columns will be null.

Returns:

all files deleted from the table in this snapshot.

manifestListLocation

java.lang.String manifestListLocation()

Return the location of this snapshot's manifest list, or null if it is not separate.

Returns:

the location of the manifest list for this Snapshot