![]() If failover, the Standby ensure it reads all of the edits from the JNs before promoting self to "Active NN". Standby NN sees the edits, it applies them to own namespace. Standby NN reads edits from the JNs, and watch them for change to the edit log. Skip to results (pretty pictures) Learn more about lzbench. It is run on 1 test machine, yielding a grand total of 7200 datapoints. The benchmark currently consists of 36 datasets, tested against 40 codecs at every compression level they offer. When any namespace modify performed by Active NN, it record log of the modify to JNs. lzbench is an in-memory benchmark of open-source LZ77/LZSS/LZMA compressors. Active NameNode is responsible for all client ops in cluster, while Standby is slave, maintaining enough state to provide fast failover.įor the Standby NN to keep synchronized w Active NN, both NN communicate with “JournalNodes” (JNs). + +- Update to version 1.19.0: + The length of automatic blocksizes for fast codecs (lz4, blosclz) has been. One NameNodes is Active, other Standby NN. + +- Enable support for SNAPPY compression. On SLES, OpenSUSE, and other similar Linux distributions. Hadoop 2.0 - HA cluster, two sperate node are NameNodes. RocksDB is an LSM database with a great compression ratio that is optimized for flash storage. The edit log comprises a series of files, called edit(journal) log segments, that together represent all the namesystem modifications made since the creation of the fsimage The fsimage is file that represents a point-in-time snapshot of the filesystem’s metadata. Hadoop 1.0 - Has "in-memory" metadata (NameSpace and Blockmap for HDFS) Filesystem metadata stored in 2 different constructs: the fsimage and the edit log. I learned about it while trying Gnome 40, in openSUSE Tumbleweed, it's also available in fedora and Gnome nightly, but I downloaded that one, it's a smaller. I also installed sysprof, both in openSUSE - though I'll have to re-install now - and in Bullseye. Not even Windows restore feature can do this. I think this gives BTFRS an edge over ext4, sure, you can install tools like timeshift and make snapshots, but you can't just boot them and see whether they work or not, most of the time they do but I've read they may fail as well leaving the users with no option but to reinstall their entire systems again. You can also use snapper either via CLI or GUI using the yast module and restore specific files only selecting them by hand without having to boot to a snapshot, but I wasn't sure which files to restore, so I just went with a full snapshot. I don't know if this is an openSUSE only feature, probably not but, grub shows the option to boot into snapshots, it's the last option, that's how I did it. Snapper rollback, rebooted and everything worked as expected. speaking of which, I upgraded KDE in Bullseye using Norbert Preining's OBS repos and now it's 5.21.3. I don't know exactly how much can influence the results the OSes different libraries, different kernel, different desktop versions. I plan to install phoronix test suite and run a couple of tests I'm more interested in applications startup time and read/write rate speed. so it's a "gotcha" but other than that it runs quite well when they're not running and in fact, the system feels very snappy and responsive. Although, I took other and BTRFS was really busy, then I learned that two maintenance processes btrfs-transacti and btrfs-cleaner were running, what they do is all explained here these two processes seem to run once a week, at least here, and when they do the system becomes very busy and can't do pretty much anything for about 2-3 minutes, maybe 5. As can be seen in the pics, disk activity is pretty much the same, with BRTFS being a little more busy. I ran this while both systems were pretty much in idle, only konsole, dolphin, conky and ksnip were running.
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