| /opt/jdk8/bin/java -agentpath:/opt/jprofiler10/bin/linux-x64/libjprofilerti.so=port=33389 -Xmx1G -Djava.io.tmpdir=/home/jan/tmp/ -Dfile.encoding=UTF-8 -classpath /opt/jdk8/jre/lib/charsets.jar:/opt/jdk8/jre/lib/deploy.jar:/opt/jdk8/jre/lib/ext/cldrdata.jar:/opt/jdk8/jre/lib/ext/dnsns.jar:/opt/jdk8/jre/lib/ext/jaccess.jar:/opt/jdk8/jre/lib/ext/jfxrt.jar:/opt/jdk8/jre/lib/ext/localedata.jar:/opt/jdk8/jre/lib/ext/nashorn.jar:/opt/jdk8/jre/lib/ext/sunec.jar:/opt/jdk8/jre/lib/ext/sunjce_provider.jar:/opt/jdk8/jre/lib/ext/sunpkcs11.jar:/opt/jdk8/jre/lib/ext/zipfs.jar:/opt/jdk8/jre/lib/javaws.jar:/opt/jdk8/jre/lib/jce.jar:/opt/jdk8/jre/lib/jfr.jar:/opt/jdk8/jre/lib/jfxswt.jar:/opt/jdk8/jre/lib/jsse.jar:/opt/jdk8/jre/lib/management-agent.jar:/opt/jdk8/jre/lib/plugin.jar:/opt/jdk8/jre/lib/resources.jar:/opt/jdk8/jre/lib/rt.jar:/home/jan/iohk/iodb/target/scala-2.12/test-classes:/home/jan/iohk/iodb/target/scala-2.12/classes:/home/jan/.ivy2/cache/ch.qos.logback/logback-classic/jars/logback-classic-1.2.3.jar:/home/jan/.iv |
| package org.mapdb.crash; | |
| /** | |
| * Created by jan on 4/2/16. | |
| */ | |
| public class Prime { | |
| static boolean isPrime(int n) { |
| package examples; | |
| import net.jpountz.lz4.LZ4Compressor; | |
| import net.jpountz.lz4.LZ4Factory; | |
| import net.jpountz.lz4.LZ4FastDecompressor; | |
| import net.jpountz.lz4.LZ4SafeDecompressor; | |
| import org.mapdb.CompressLZF; | |
| import org.mapdb.DB; | |
| import org.mapdb.DBMaker; |
| /* | |
| - previous example was using `byte[]` as a backend, so it was failing. This example uses DirectByteBuffer | |
| - it had cache which was consuming a lot of Heap | |
| - set JVM memory limits: | |
| -Xmx64M -XX:MaxDirectMemorySize=2G | |
| - current master branch does not have storage statistics. I did rewrite and its not implemented yet. | |
Append-Only-Files is key-value storage where key is 8-byte long and value serialized byte[]. It writes modified data to the end of the file, never overwriting existing data. In theory it is more durable than other transactional stores such as write-ahead-log.
Because older versions are kept around it is very easy to implement snapshots and other advanced features.
| 1 - Hello | |
| -------------- | |
| Hello, I am Jan Kotek and in this podcast I will give you quick overview of MapDB; | |
| an embedded java database engine. | |
| 2 - MapDB | |
| --------- | |
| Traditional Java collections are limited to a few gigabytes by garbage collector and heap size. |
| *This is section from 'A Cryptographic Evaluation of IPsec' by N. Ferguson and B. Schneier. I think it applies to programming in general.* | |
| *Original can be found at: https://www.schneier.com/paper-ipsec.html* | |
| Security’s worst enemy is complexity. | |
| This might seem an odd statement, especially in the light of the many simple | |
| systems that exhibit critical security failures. It is true nonetheless. Simple fail- | |
| ures are simple to avoid, and often simple to fix. The problem in these cases |