Release 0.96 on 09/05/2012 Changes made since 0.90.1 * Monitoring: * Append cluster name to various mbeans for better stats display * Implement average throughput in bytes * Add BDB JE stats * Add 95th and 99th latency tracking * Add stats for ClientRequestExecutorPool * Add error/exception count and max getall count * BDB+ Data cleanup Monitoring changes * Rebalancing: * Donor-based rebalancing and post cleanup (see https://github.com/voldemort/voldemort/wiki/Voldemort-Donor-Based-Rebalancing for more details) * Rebalancing integration testing framework (under test/integration/voldemort/rebalance/) * Generate multiple cluster.xml files based on the number specified when running the tool and choose the cluster with the smallest std dev as the final-cluster.xml * Add status output to log for updateEntries (used by rebalancing) * Read-only pipeline: * Add hftp and webhdfs support * Read-only bandwidth dynamic throttler * Add minimum throttle limit per store * Add rollback capability to the Admin tool * Voldemort-backed stack and index linked list impl * Change client requests to not process responses after timeout * Modified client request executor timeout to not factor in the NIO selector timeout * Added BDB native backup capabalities, checksum verification and incremental backups (well tested, but not yet used in production) * Add additional client-side tracing for debugging and consistency analytics * Clean up logging during exception at client-side * Security exception handling * Add snappy to CompressionStrategyFactory * Add configurable option to interrupt service being unscheduled * Add logging support for tracking ScanPermit owners (for debugging purposes) * Add a jmx terminate operation for async jobs * Add zone option for restore from replicas * Changing the enable.nio.connector to true by default * Better disconnection handling for python client * Split junit tests into a long and a short test suites * Add separate timeouts for different operations (put, get, delete, and getAll * Allow getAll to return partial results upon timeout * Improved cluster generation tool * Added log4j properties folder for junit test * Bug fixes: * httpclient 3.x to httpclient 4.x * Fix NPE in listing read-only store versions * Fixed 2 failure detector bugs during rebalancing or node swapping * Fixed a thread leak issue in StreamingSlopPusher * Fixed a NIO bug * Fixed a bug in TimeBasedInconsistency resolver. * Fixed race condition in client socket close * Fixed a potential deadlock issue in ScanPermitWrapper * Fixed a bug where a read returns null (on rare occations) when being concurrent with a write * Fixed a performance bug in HdfsFetcher when hftp is used Changes made since 0.90 * Updated the documentation for Voldemort shell tool in NOTES * Added Admin API to perform Bdb data cleanup (repairJob) and corresponding unit tests * Fixes in restore from replication, store creation code * Improved failure detector configuration. ThresholdFailureDetector is now the default option * Multiple Fixes to the Voldemort ruby client * Added additional Jmx metrics to expose Bdb environment statistics, caching statistics and Voldemort batch operation statistics * Updated default timeout for restore 'from replica' to 365 days * New feature in the performance tool: '--use-sample' option enables 'read, write back unmodified' transactions in place of writes in the workload (allows for testing read-write transactions on stores with complex schemas) * Added the ability to dynamically update cluster.xml and reinitialize the scheduler Release 0.90 on 7/10/2011 Changes made since 0.81 * All upgrading instructions can be found here - https://github.com/voldemort/voldemort/wiki/Upgrading-from-0.81 * Tooling - Single consolidated administrative tool - Got rid of the admin client shell and have a better Voldemort admin tool. More documentation - https://github.com/voldemort/voldemort/wiki/Voldemort-Admin-tool * Web manager - Basic GUI in JRuby ( and Sinatra ), capable of querying for store metadata. - Read contrib/web-manager/README.md for more details * Rebalancing - New better rebalancing support with (a) checkpointing (b) progress bar (c) support for RO store rebalancing - Documentation - https://github.com/voldemort/voldemort/wiki/Voldemort-Rebalancing - In the process solves Issue 203, 288, 305, 307, 311 * Client side changes - Pipeline routed store ( with support for topology awareness ) - Changed the default client side routing to use a state machine like system. More documentation - https://github.com/voldemort/voldemort/wiki/RoutedStore-redesign - Lazy store client - Some of our clients are very inactive and don't really do many requests. For such clients it doesn't make sense to bootstrap the metadata at startup. Hence from now onwards clients instantiated from SocketStoreClientFactory give a LazyStoreClient which will not bootstrap till the first request is made - Caching store client factory - We have also checked-in a new store client factory which we use internally at LinkedIn to cache store clients for stores which we repeatedly. - Failure detector - We have fixed some bugs in the ThresholdFailureDetector. This is an improvement over the naive BannageFailureDetector which would aggressively mark nodes down after a single failure. More details - https://github.com/voldemort/voldemort/wiki/Client-side-failure-detector-implementations - Issue 219: StoreClient::put returns a Version - You may have to upgrade your clients since now the StoreClient returns a version to be used in successive requests. * Read-only store changes - Admin based store swapper - Till 0.81 we relied on a servlet based fetcher / swapper. Now we support an admin based store swapper which reports progress. - Other changes - (a) New directory format (b) Two new data format. Support for iterating over read-only data (c) Checksum of data in .metadata file (d) Some monitoring changes of RO stores * Jar upgrades - Introduction of JNA 3.2.7 - We have introduced JNA 3.2.7 in this release for supporting symbolic links in read-only stores. More details about the new RO format and changes can be found here - https://github.com/voldemort/voldemort/wiki/Upgrading-from-0.81 - Protocol Buffers 2.3.0 - Upgrading protocol buffers from 2.2.0 to 2.3.0 - Avro 1.4.0 - Upgraded Avro from 1.3.0 to 1.4.0 * Storage engine - Added support for Krati 0.3.6 as a storage engine ( http://sna-projects.com/krati/ ) - https://github.com/voldemort/voldemort/tree/release-090/contrib/krati * Core features - Hinted handoff - https://github.com/voldemort/voldemort/wiki/Hinted-Handoff - Experimental support for server side transforms - https://github.com/voldemort/voldemort/wiki/Server-side-transforms-in-Voldemort - Topology awareness ( i.e. datacenter / rack ) - https://github.com/voldemort/voldemort/wiki/Topology-awareness-capability - Repair Job ( Job which will delete data if the node is not responsible for it ) * Better monitoring - Tons of JMX changes ( average bytes, etc ) - More details ( https://github.com/voldemort/voldemort/wiki/JMX-Monitoring ) - Key distribution generator - Ability to estimate skew of your cluster ( ./bin/run-class.sh voldemort.utils.KeyDistributionGenerator ) * Clients - Python - Updated Python client with support for Binary JSON serialized stores ( ./clients/python/README ) - Ruby - Updated Ruby client ( ./clients/ruby/README.md ) Release 0.81 on 6/15/2010 Changes made since 0.80.2: * IMPORTANT: we have upgraded the Hadoop Core jar to v0.20.2. Since this version of Hadoop requires Java 6, in order to retain backwards compatibility with Java 5, you will need to replace this jar with the Hadoop 0.18.* core jar. * Multiple donors for Voldemort Rebalancing: speeds up rebalancing, by allowing a single stealer node to transfer partitions from multiple nodes * Features for EC2 Testing * Read-only Stores: backwards compatibility with 0.70, bug fix in Checksum code * Hadoop InputFormat, Pig LoadFunc in Contrib: ability to perform Map/Reduce (either directly via Hadoop or using Pig) over data in Voldemort stores. See: < contrib/hadoop/test/voldemort/hadoop/VoldemortWordCount.java > for an example. * Voldemort Performance Tool: performance measurement tool based on YCSB (Yahoo Cloud Serving Benchmark) code. Run < bin/voldemort-performance-tool.sh --help > for more information. * Reverted default failure detector implementation back to BannagedPeriodFailureDetector due to potential bugs in the ThresholdFailureDetector Release 0.80.2 on 4/27/2010 Changes made since 0.80.1: * Batched NIO writes (improves performance for AdminClient/Streaming operations when the NIO connector is enabled) * VoldemortAdminTool: Added support to specify stores, support to fetch all keys to a binary file, support to save keys in ASCII (JSON) format [experimental], capability to add stores. Run < bin/voldemort-admin-tool.sh --help > for more information. * Minor bug fixes for Rebalancing * Issue 240: Voldemort fetcher should use different temp directories for different stores * Checksum capability during construction of Voldemort read-only stores Release 0.80.1 on 3/23/2010 Changes made since 0.80: * Issue 133: Support for Apache Avro as a serialization format * Issue 223: Changed the default client to use TresholdFailureDetector * Fixed issue 222: Revised KeyedResourcePool.close(K key) to fix leaking sockets * Fixed issue 198: Revised ReadRepairer to use a separate copy of the vector clock, fixing a situation where NoSuchElementException would be thrown * Miscellaneous enhancement: support for TCP keep-alives, improved read only store utilities, command line interface to AdminClient, improved load testing tools Release 0.80 on 2/18/2010 Changes made since 0.70.1: * IMPORTANT: backwards compatibility between the client and server has changed. A backwards incompatibility in the wire protocol was found between releases 0.60 to 0.70.1 and releases prior to 0.60. We chose to make 0.80 compatible with 0.57.1 and earlier versions, while introducing an incompatibility with 0.60-0.70.1. What this means is that if you're presently running 0.60 and higher, you would need to upgrade the Voldemort jar files on *all* servers and clients. * Upgraded the BDB storage engine to use BerkeleyDB-JE 4.0.92, retaining ability to use BerkeleyDB-JE 3.3.* if desired. IMPORTANT: if one switches from BerkeleyDB-JE 3.3.* to 4.0.92 they will be able to access all of existing data. Once a switch has been made to 4.0.92 the data will not be readable by earlier versions of BDB. If there's a chance that a roll back to 3.3.* might be needed, the best course of action will be to make a backup of existing data prior to upgrading. Switching between 3.3.* and 4.0.* would also require rebuilding the class files (e.g., by running "ant clean && ant release" after replacing the BDB jar files). * Compression support for read-only stores * Increased the socket buffer size for transferring read-only stores from Hadoop for improved performance over high-latency links * NIO support for the Admin Service, including Streaming Functionality * Support for adding stores on the fly via the Admin Service * Fixed issue 209: Incorrect object passed to List.contains in RebalanceUtils.getLatestCluster() * Fixed issue 211: Unnecessary read repairs during getAll() with more than one key * Other enhancements: better CLI for rebalancing, throttling in Admin Service is now based on all disk activity Release 0.70.1 on 2/1/2010 Changes made since 0.70: * Fixed issue 205: if no keys passed to getAll() were in partitions undergoing rebalancing, proxyGetAll() would be called with an empty list even if rebalancing wasn't happening Release 0.70 on 1/27/2010 Changes made since 0.60.1: * A beta of rebalancing (dynamic cluster expansion) support merged into the main branch. See the project's wiki for more information: http://wiki.github.com/voldemort/voldemort/voldemort-rebalancing * New failure detector merged into the main branch: http://wiki.github.com/voldemort/voldemort/failure-detection * Beta mechanism for restoring all of node's data from replicas on demand. This is an alternative to a more gradual mechanism provided by read-repair: useful when a machine is down for a prolonged period and is then re-inserted into the cluster. Invoked via JMX: the operation is restoreDataFromReplication in the voldemort.server.VoldemortServer MBean, with a mandatory parameter (integer >= 1) indicating the number of transfers to do in parallel. * Simple gossip protocol (for cluster metadata) merged into the main branch. Disabled by default: use "enable.gossip=true" to enable, use "gossip.interval.ms" to set an interval at which gossip occurs (default: 30000 i.e., 30 seconds). * Fixed issue 190: add a way of aggregating performance data over all stores * Fixed issue 181: stack trackes shouldn't be filled for Obsolete version exception Release 0.60.1 on 12/18/2009 Minor changes made since 0.60: * Better logging in the exception thrown if config/.temp and config/.version are copied * Bumping up the version to 0.60.1 in order to release updated archives, fixing an error in the stores.xml for single_node_cluster sample config Release 0.60 on 12/15/2009 Changes made since 0.57.1: * Admin Client/Server API: adds support for streaming-based transfer of entries between nodes, deleting entries on remote nodes, remotely deleting and updating metadata * EC2 testing: a way to periodically run integration and performance tests which involve Voldemort instances on different machines * Experimental support for views * Interpolation search for read-only stores * Support for large lists and strings in the JSON serializer * LZF compression support * Ruby client contributed * Fixed issue 170: hanging if a port is used by another process * Fixed issue 122: suspicious integer division in RequestCounter.getThroughput * Miscellaneous improvements and bug fixes for read-only stores * Fixed issue 168: added StorageEngine.keys() Release 0.57.1 on 11/27/2009 Minor change made since 0.57: * Modified build.xml to exclude .git directory from release tarballs/zipfiles Release 0.57 on 11/16/2009 The following changes were made since 0.56: * Fixed an issue in ReadOnlyEngine's close() method * Fixed hidden logging in StorageService * Fix for issue 163 (lock mode during get) * Exposed bdb environment stats with setFast(false) Release 0.56 on 10/26/2009 The following changes were made since 0.55: * Fix for issue 164: Changed default bdb.max.logfile.size to 60MB * Make file deletes asynchronous in read only store swap * Added better debug logs for bdb stats * Fixed race condition in AbstractSocketPoolTest * Added improved monitoring for bdb stats * Added backoff and retry logic in bootstrap code * Not logging obosleteVersionException(s) or counting it in JMX exception count * Fixed issue 159 * C++ client building on OS X * Rely only on the number of versions returned to decide whether to retrieve the value for put(K,V) * Implemented issue 152: getVersion() API in Store Release 0.55 on 10/7/2009 The following changes were made since 0.52 (in summary): * Add an event throttler * Added DataCleanupJob * Protocol buffers at version 2.2.0 * BDB JE upgraded to 3.3.87 * Added data compression support (enable by adding gzip to value-serializer or key-serializer sections in stores.xml) * Added a resource pool/socket pool implementation (no longer using commons-pool) * Added server-side NIO support (enabled by setting enable.nio.connector=true in server.properties) * Improved the efficiency of the protocol buffers network protocol by using CodedOutputStream/CodedInputStream (zero copy transfers) * Fix for issue #21: incorrectness in vector clock inconsistency resolver * Upgrade google-collections * Support for building read only stores in Hadoop * Added a C++ client