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Revert "Raft Notary: remove snapshotting" (#2423)

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This reverts commit cf33be66ff.
This commit is contained in:
Thomas Schroeter 2018-01-26 16:23:59 +00:00 committed by GitHub
parent e357a88181
commit 4257891c98
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 29 additions and 1 deletions
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30
node/src/main/kotlin/net/corda/node/services/transactions/DistributedImmutableMap.kt
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@ -3,7 +3,10 @@ package net.corda.node.services.transactions
import io.atomix.copycat.Command
import io.atomix.copycat.Query
import io.atomix.copycat.server.Commit
import io.atomix.copycat.server.Snapshottable
import io.atomix.copycat.server.StateMachine
import io.atomix.copycat.server.storage.snapshot.SnapshotReader
import io.atomix.copycat.server.storage.snapshot.SnapshotWriter
import net.corda.core.utilities.contextLogger
import net.corda.node.utilities.AppendOnlyPersistentMap
import net.corda.nodeapi.internal.persistence.CordaPersistence
@ -16,7 +19,7 @@ import java.util.*
* The map contents are backed by a JDBC table. State re-synchronisation is achieved by replaying the command log to the
* new (or re-joining) cluster member.
*/
class DistributedImmutableMap<K : Any, V : Any, E, EK>(val db: CordaPersistence, createMap: () -> AppendOnlyPersistentMap<K, Pair<Long, V>, E, EK>) : StateMachine() {
class DistributedImmutableMap<K : Any, V : Any, E, EK>(val db: CordaPersistence, createMap: () -> AppendOnlyPersistentMap<K, Pair<Long, V>, E, EK>) : StateMachine(), Snapshottable {
companion object {
private val log = contextLogger()
}
@ -75,4 +78,29 @@ class DistributedImmutableMap<K : Any, V : Any, E, EK>(val db: CordaPersistence,
return db.transaction { map.size }
}
}
/**
* Writes out all [map] entries to disk. Note that this operation does not load all entries into memory, as the
* [SnapshotWriter] is using a disk-backed buffer internally, and iterating map entries results in only a
* fixed number of recently accessed entries to ever be kept in memory.
*/
override fun snapshot(writer: SnapshotWriter) {
db.transaction {
writer.writeInt(map.size)
map.allPersisted().forEach { writer.writeObject(it.first to it.second) }
}
}
/** Reads entries from disk and adds them to [map]. */
override fun install(reader: SnapshotReader) {
val size = reader.readInt()
db.transaction {
map.clear()
// TODO: read & put entries in batches
for (i in 1..size) {
val (key, value) = reader.readObject<Pair<K, Pair<Long, V>>>()
map[key] = value
}
}
}
}