Public

getOperations

<init>

accepts

getAllocator

getLiveDataSize

isClean

isExpired

partitionCount

Should only be called by ColumnFamilyStore.apply via Keyspace.apply, which
supplies the appropriate 

setDiscarded

setDiscarding

toString

abortRunnables

createFlushRunnables

findMinLocalDeletionTime

flushRunnables

getCommitLogLowerBound

getCommitLogUpperBound

getMinTimestamp

getPartition

Memtable

Making http requests using okhttp

java.awt.image.Kernel

A writable sink for bytes.Most clients will use output streams that write data
to the file system ( 

java.io.OutputStream

Java representation of an SQL TIME value. Provides utilities to format and parse
the time's represen

java.sql.Time

HashSet is an implementation of a Set. All optional operations (adding and
removing) are supported. 

java.util.HashSet

This class provides access to implementations of cryptographic ciphers for
encryption and decryption

javax.crypto.Cipher

The LoggerFactory is a utility class producing Loggers for various logging APIs,
most notably for lo

org.slf4j.LoggerFactory

findViewById

notifyDataSetChanged

startActivity

/*
         * We have 2 main strategies:
         *   1) We query memtables and sstables simulateneously. This is our most generic strategy and the one we use
         *      unless we have a names filter that we know we can optimize futher.
         *   2) If we have a name filter (so we query specific rows), we can make a bet: that all column for all queried row
         *      will have data in the most recent sstable(s), thus saving us from reading older ones. This does imply we
         *      have a way to guarantee we have all the data for what is queried, which is only possible for name queries
         *      and if we have neither non-frozen collections/UDTs nor counters (indeed, for a non-frozen collection or UDT,
         *      we can't guarantee an older sstable won't have some elements that weren't in the most recent sstables,
         *      and counters are intrinsically a collection of shards and so have the same problem).
         */

// 'iter' is added to iterators which is closed on exception, or through the closing of the final merged iterator

/*
             * We can't eliminate full sstables based on the timestamp of what we've already read like
             * in collectTimeOrderedData, but we still want to eliminate sstable whose maxTimestamp < mostRecentTombstone
             * we've read. We still rely on the sstable ordering by maxTimestamp since if
             *   maxTimestamp_s1 > maxTimestamp_s0,
             * we're guaranteed that s1 cannot have a row tombstone such that
             *   timestamp(tombstone) > maxTimestamp_s0
             * since we necessarily have
             *   timestamp(tombstone) <= maxTimestamp_s1
             * In other words, iterating in maxTimestamp order allow to do our mostRecentPartitionTombstone elimination
             * in one pass, and minimize the number of sstables for which we read a partition tombstone.
             */

// if we've already seen a partition tombstone with a timestamp greater

// than the most recent update to this sstable, we can skip it

// if sstable has tombstones we need to check after one pass if it can be safely skipped

// 'iter' is added to iterators which is closed on exception,

// or through the closing of the final merged iterator

// Check for sstables with tombstones that are not expired

// 'iter' is added to iterators which is close on exception,

"Skipped {}/{} non-slice-intersecting sstables, included {} due to tombstones"

/**
     * @param key
     * @return a predicate for whether tombstones marked for deletion at the given time for the given partition are
     * purgeable; we calculate this by checking whether the deletion time is less than the min timestamp of all SSTables
     * containing his partition and not participating in the compaction. This means there isn't any data in those
     * sstables that might still need to be suppressed by a tombstone at this timestamp.
     */

// if we don't have bloom filter(bf_fp_chance=1.0 or filter file is missing),

/**
     * Do a read by querying the memtable(s) first, and then each relevant sstables sequentially by order of the sstable
     * max timestamp.
     *
     * This is used for names query in the hope of only having to query the 1 or 2 most recent query and then knowing nothing
     * more recent could be in the older sstables (which we can only guarantee if we know exactly which row we queries, and if
     * no collection or counters are included).
     * This method assumes the filter is a {@code ClusteringIndexNamesFilter}.
     */

// than the most recent update to this sstable, we're done, since the rest of the sstables

// This mean that nothing queried by the filter can be in the sstable. One exception is the top-level partition deletion

// however: if it is set, it impacts everything and must be included. Getting that top-level partition deletion costs us

// some seek in general however (unless the partition is indexed and is in the key cache), so we first check if the sstable

// has any tombstone at all as a shortcut.

// no tombstone at all, we can skip that sstable

// We need to get the partition deletion and include it if it's live. In any case though, we're done with that sstable.

// "hoist up" the requested data into a more recent sstable

// !!WARNING!!   if we stop copying our data to a heap-managed object,

//               we will need to track the lifetime of this mutation as well

// skipping commitlog and index updates is fine since we're just de-fragmenting existing data

How to use getPartitionmethodin org.apache.cassandra.db.Memtable

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How to use
getPartition
method
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org.apache.cassandra.db.Memtable