com.twitter.finatra.streams.stores
CachingFinatraKeyValueStore
Related Doc:
package stores
Removes the database entries in the range ["begin_key", "end_key"), i.e., including "begin_key" and excluding "end_key".
Removes the database entries in the range ["begin_key", "end_key"), i.e., including "begin_key" and excluding "end_key". Returns OK on success, and a non-OK status on error. It is not an error if no keys exist in the range ["begin_key", "end_key").
This feature is currently an experimental performance optimization for deleting very large ranges of contiguous keys. Invoking it many times or on small ranges may severely degrade read performance; in particular, the resulting performance can be worse than calling Delete() for each key in the range. Note also the degraded read performance affects keys outside the deleted ranges, and affects database operations involving scans, like flush and compaction.
Consider setting ReadOptions::ignore_range_deletions = true to speed up reads for key(s) that are known to be unaffected by range deletions.
Note: Changelog entries will not be deleted, so this method is best used when relying on retention.ms to delete entries from the changelog
Delete the value from the store (if there is one) Note: This version of delete avoids getting the prior value which keyValueStore.delete does
Delete the value from the store (if there is one) Note: This version of delete avoids getting the prior value which keyValueStore.delete does
The key
The old value or null if there is no such key.
NullPointerException If null is used for key.
Get the value corresponding to this key or return the specified default value if no key is found
Get the value corresponding to this key or return the specified default value if no key is found
The key to fetch
The default value to return if key is not found in the store
The value associated with the key or the default value if the key is not found
InvalidStateStoreException if the store is not initialized
NullPointerException If null is used for key.
Get an iterator over a given range of keys.
Get an iterator over a given range of keys. This iterator must be closed after use.
The returned iterator must be safe from java.util.ConcurrentModificationExceptions
and must not return null values. No ordering guarantees are provided.
Inclusive bytes to start the range scan
Exclusive bytes to end the range scan
The iterator for this range.
InvalidStateStoreException if the store is not initialized
NullPointerException If null is used for from or to.
A range scan starting from bytes.
A range scan starting from bytes.
Note 1: This is an API for Advanced users only
Note 2: If this RocksDB instance is configured in "prefix seek mode", than fromBytes will be used as a "prefix" and the iteration will end when the prefix is no longer part of the next element. Enabling "prefix seek mode" can be done by calling options.useFixedLengthPrefixExtractor. When enabled, prefix scans can take advantage of a prefix based bloom filter for better seek performance See: https://github.com/facebook/rocksdb/wiki/Prefix-Seek-API-Changes
Get an iterator over a given range of keys.
Get an iterator over a given range of keys. This iterator must be closed after use.
The returned iterator must be safe from java.util.ConcurrentModificationExceptions
and must not return null values. No ordering guarantees are provided.
The first key that could be in the range
The last key that could be in the range
Allow stale reads when querying a caching key value store. If set to false, each query will trigger a flush of the cache.
The iterator for this range.
InvalidStateStoreException if the store is not initialized
NullPointerException If null is used for from or to.
Register a flush listener callback that will be called every time a cached key value store entry is flushed into the underlying RocksDB store
Register a flush listener callback that will be called every time a cached key value store entry is flushed into the underlying RocksDB store
Flush callback for cached entries
The task id associated with this store
The task id associated with this store
(Since version 1/7/2019) no longer supported
A FinatraKeyValueStore with a callback that fires when an entry is flushed into the underlying store