announce-list October 2014

announce-list@monetdb.org

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Announcement: New Oct2014 Feature release of MonetDB suite

by Sjoerd Mullender

The MonetDB team at CWI/MonetDB BV is pleased to announce the Oct2014 feature release of the MonetDB suite of programs. More information about MonetDB can be found on our website at <http://www.monetdb.org/>. For details on this release, please see the release notes at <http://www.monetdb.org/Downloads/ReleaseNotes>. As usual, the download location is <http://dev.monetdb.org/downloads/>. Important consideration when upgrading to this release. In this release we have fixed bug 3474. This bug made it possible that there were duplicates despite there being a unique or primary key constraint present. This could only happen for multi-column constraints. MonetDB maintains an internal column containing a hash for multi-column constraints, and there was a bug in the maintenance code of this column. During an upgrade, this column needs to be recreated. This is done by dropping and adding back the constraints. If there are no duplicates, adding back the constrains should work without problem, but if there are duplicates, adding the constraints will fail. There is unfortunately no easy way to tell the user, so after having made the first connection to the server (when the upgrade happens), check the merovingian log (if you use merovingian -- also known as monetdbd) or the server output window (if you don't use merovingian). Jaql support is removed. The experimental code for Jaql support has been removed. If you have RPM or DEB packages for Jaql installed from an earlier version (MonetDB-jaql and monetdb5_jaql respectively), you will need to uninstall them before the upgrade. Known issue when upgrading old versions. We have noticed that upgrading directly from a version older than the Jan2014 release gave an error. Upgrading to Jan2014 first and then on to Oct2014 should work. Backup. As always, make a backup of your databases before upgrading. Oct 2014 feature release MonetDB5 Server * Removed algebra.materialize. * Removed algebra.kunique and algebra.tunique. They were subsumed by algebra.subunique. * Remove algebra.antiuselect and algebra.thetauselect. They were subsumed by algebra.subselect. * Removed algebra.topN and its imlementation BATtopN. The function was not used. * Removed aggr.histogram and its implementation BAThistogram. The function was not used, and did not produce output in the "headless" (i.e. dense-headed) format. Histograms can be created as a by-product of group.subgroup. Build Environment * Jacqueline, the MonetDB/JAQL frontend, has been removed. The frontend never grew beyond being experimental, and there is no interest anymore to maintain the code. Merovingian * monetdb create: add -p flag to set monetdb user password on creation, and therefore allow creating the database in unlocked state mapilib * Changed mapi_timeout argument from seconds to milliseconds. stream * Changed mnstr_settimeout function so that the specified timeout is now in milliseconds (used to be seconds), and that it also needs an extra argument specifying a callback function (no arguments, int result) that should return TRUE if the timeout should cause the function to abort or continue what it was doing. MonetDB Common * Added "multifarm" capability. It is now possible to separate persistent and transient BATs into different directories (presumably on different disks). This can be done by using the --dbextra option of mserver5 (see the man page). SQL * Added PostgreSQL compatible string TRIM, LTRIM, RTRIM, LPAD and RPAD functions * Stop support for upgrading directly from a database created with a server from the Oct2012 release or older. You can upgrade via the Feb2013 or Jan2014 release. Bug Fixes * 2945: evaluation of SQL "between SYMMETRIC" requires MAL iterator because there is no (bulk) MIN/MAX(a,b) * 3204: monetdb create: allow setting admin password during creation * 3390: Missing definition for pushSht in monetdb5/mal/mal_builder.h * 3402: We should have a C implementation of mal.multiplex. * 3422: Segmentation fault after large table insert * 3459: incomplete implementation of JDBC driver getNumericFunctions(), getStringFunctions(), getSystemFunctions(), getTimeDateFunctions(), getSQLKeywords() methods in MonetDatabaseM * 3471: JDBC driver: incorrect output result of SQL query: SELECT 1 ; * 3474: bulk and scalar versions of mkey.rotate_xor_hash differ * 3484: COPY INTO on a file works fine on Linux/OSX, but not on Windows * 3488: Slow SQL execution for correlated scalar subquery * 3489: SQL query with ORDER BY does not order its result as requested * 3490: SQL query kills the mserver5 (Segmentation fault) * 3491: SQL query kills the mserver5 (Segmentation fault) * 3493: Test monetdb5/modules/mal/Tests/pqueue.mal fails since recent checkins * 3494: Tests monetdb5/modules/mal/Tests/pqueue[23].mal lack correct/expected/intended output * 3495: Test sql/test/centipede/Tests/olap.sql lacks correct/expected/intended output * 3497: monetdb start reports crash in merovingian.log * 3498: SQL throws TypeException if aggregations and limit statements are both present * 3502: Database was killed by signal SIGBUS * 3504: COPY INTO does not allow OFFSET without specifying amount of records * 3505: expression with <boolean> = NOT <boolean> returns a syntax error but NOT <boolean> = <boolean> not * 3506: conversion to varchar terminates mserver * 3508: conversion of string '0 ' to type smallint or integer fails * 3510: timestamp + month interval generates bogus MAL? * 3511: When having multiple selections combined with aliases not all of them seem to be evalauted. * 3512: auto-conversion of string to `sht` type no longer works * 3513: COPY BINARY INTO fails on 6gb file; works fine on 3gb * 3516: inserting '0' into a column of datatype numeric fails * 3518: UNION with subqueries * 3521: large results of function exp() are not automatically returned as double * 3522: SQL catalog table sys.columns lists columns for table ids which do not exist in sys.tables * 3523: Window function over union gives no result * 3524: wrong error on missing aggregation column * 3527: select distinct - order by - limit 2 results in one single result * 3528: segfault at mal_session.c:521 * 3532: several geom tests crash after manifold changes * 3534: missing table name with invalid column in join using (and problems after resolving it) * 3536: program contains error with join using integer and smallint * 3542: gdk/gdk_bat.c:2904: BATassertHeadProps: Assertion `!b->H->revsorted || cmp >= 0' failed. * 3543: invalid behavior and incorrect data results for SQL data type: numeric(4,4) * 3544: sys.reuse() corrupts data * 3546: Division by zero in CASE statement that should avoid it * 3547: Empty query when selecting a field from a view made of UNION ALL * 3551: Wrong ticks in TRACE * 3552: incorrect data results for "WHERE int_col <> 0" * 3554: Issue with subselect and ORDER BY * 3555: Order of evaluation inside CASE WHEN * 3558: numeric values (as strings) are incorrectly parsed/converted and invalid strings are accepted without error * 3560: Error "BATproject: does not match always" with subselect/groupby/having * 3562: mserver5: gdk_bat.c:2855: BATassertHeadProps: Assertion `!b->H->revsorted || cmp >= 0' failed. * 3563: incorrect results for scalar function locate(in_str, search_str, occurrence) * 3565: Wrong/confusing error message when trying to add a FK to a TEMP TABLE * 3572: Table names with escaped double quotes are rejected * 3573: alter table alter_not_null_test alter test set NOT NULL; is accepted when test contains null. This used to be restricted but isn't anymore * 3575: segmentation fault in mserver5 process * 3576: Dropping default value definitions from a table does not work as expected * 3577: SIGSEGV in BATins_kdiff * 3579: segmentation fault in mserver5 process * 3581: mserver5: rel_bin.c:2504: rel2bin_groupby: Assertion `0' failed. * 3582: mserver5: sql_mem.c:48: sql_ref_dec: Assertion `r->refcnt > 0' failed. * 3583: Possible buffer overflow in max(varchar) * 3585: Incorrect query terminates connection * 3586: mserver5: sql/storage/store.c:3610: sys_drop_func: Assertion `rid_func != oid_nil' failed. * 3592: SIGSEGV in MANIFOLDjob * 3593: delta_append_val: Assertion `!c || ((c)->S->count) == bat->ibase' failed. * 3594: gdk/gdk_bat.c:2855: BATassertHeadProps: Assertion `!b->H->revsorted || cmp >= 0' failed. * 3595: Race/heap corruption on thread exit * 3596: gdk_bat.c:2861: BATassertHeadProps: Assertion `!b->H->nonil || cmp != 0' failed. * 3597: SQL to MAL listing looses types * 3598: SQL bulk load should ignore leading/trailing spaces also with type decimal (as with integers & real/double) * 3599: Double-free of imprints * 3601: Trivial typo in debian/monetdb5-sql.init.d * 3603: "monetdb create -p" hangs monetdbd * 3604: Sys.queue ignored upon errors

7 years, 9 months

Fully-funded PhD and postdoc positions in Big Data --- Science, Analytics & Management

by Stefan Manegold

Fully-funded PhD and postdoc positions in Big Data --- Science, Analytics & Management Care to do fundamental, cutting-edge system-oriented Big Data research in a world-renowned and pioneering data management research group? Care to enjoy life in a world-famous, very lively but sufficiently cozy European capital that dubs as a intercontinental hub for both air-travel and internet traffic? Then consider joining us, the Database Architectures research group, aka. "The MonetDB Team", at Centrum Wiskunde & Informatica (CWI), the Dutch national research institute for mathematics and computer science, in Amsterdam, The Netherlands! We are looking for excellent candidates, preferably with a strong systems-oriented computer science background, for PhD student and post-doctoral research positions on various aspects of Big Data --- Science, Analytics & Management. For detailed descriptions of the open positions, please consult the following links: http://www.cwi.nl/jobs/phd-student-subject-of-data-management-big-data-anal… http://www.cwi.nl/jobs/postdoc-subject-of-array-based-data-management-techn… http://www.cwi.nl/jobs/postdoc-subject-of-spatio-temporal-andor-distributed… CWI's Database Architectures research group fulfills a well recognised leading role in system-oriented database research, both nationally and internationally. The group's research is focused on bridging the gap between database architectures and demanding applications areas, such as large-scale data analytics (Big Data), data intensive scientific discovery (Data Science), and semantic web. The group is particularly known for their pioneering work on hardware-conscious database technology, with a strong focus on data analytics, and for disseminating their research via their open-source columnar analytical database management system MonetDB, which is widely used in academia and business. The group also has a track record of founding successful start-up companies (DataDistilleries, VectorWise, MonetDB). CWI’s Database Architectures group and its members have been decorated with several prestigious awards, among others - 2014 ACM SIGMOD Edgar F. Codd Innovations Award (M. Kersten) - 2013 Humboldt-Forschung-Preis / Humboldt-Research-Award (P. Boncz) - 2011 ERCIM Cor Baayen Award (S. Idreos) - 2011 VLDB Challenges & Visions Track Best Paper Award (M. Kersten, S. Idreos, S. Manegold, E. Liarou) - 2011 ACM SIGMOD Jim Gray Doctoral Dissertation Award (S. Idreos) - 2009 VLDB 10-year Best Paper Award (P. Boncz, S. Manegold, M. Kersten) - 2009 ACM SIGMOD Best Paper Runner Up (M. Ivanova, M. Kersten, N. Nes, R. Gonçalves) The group has a long track record of publishing their fundamental research in leading international database journals (ACM TODS, IEEE TKDE, VLDB Journal), conferences (ACM SIGMOD, VLDB, IEEE ICDE, EDBT) as well as co-located workshops, and successfully participating in EU projects (e.g., RETHINKbig, LEO, EMILI, TELEIOS, LOD2, LDBC, PlanetData, and most notably the Human Brain Project, one of the two EU FET flagship projects) and large national programs (MultimendiaN, COMMIT). The groups good contacts with leading database research groups, both academic and industrial, provide ample opportunities for collaborations and internships. Funded by a Dutch national grant, CWI's Database Architectures research group has been building a large database machine, the "SciLens cluster", in order to assess their technology empirically on large data sets. Currently, the SciLens cluster consists of 272 nodes (organized in 3 tiers with different characteristics) and provides a total of 2 PB of hard disk storage, 64 TB flash storage, 15 TB RAM, 2688 CPU cores, 12 high-end GPU- and accelerator-cards, and high-bandwidth (40 Gb/s) Infiniband network. http://www.cwi.nl/research-groups/Database-Architectures http://www.cwi.nl/ http://www.monetdb.org/ http://homepages.cwi.nl/~manegold/ http://homepages.cwi.nl/~mk/ -- | Stefan.Manegold(a)CWI.nl | DB Architectures (DA) | | www.CWI.nl/~manegold/ | Science Park 123 (L321) | | +31 (0)20 592-4212 | 1098 XG Amsterdam (NL) |

7 years, 9 months

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announce-list October 2014