[Image](/uploads/documents/c/e/3/5/ce353b34c2400396fecde170dbc2e9a6/p8_5.jpg) Hive ## WHAT 我们需要什么样的存储？ Append only：尾部写入，不变顺序读取 分布式 高性能 可靠性 顺序一致性 (近乎)无限容量 ## Q → J ## JournalQ ## JournalKeeper XXX Pub/Sub

also filter the lines read from the file using the regex property. For instance: regex=(*foo.*) Only the line matching the regex will be sent to the dispatcher. For instance, instead of the log collector MBeanServer #password=karaf # Object name filter to use. Instead of harvesting all MBeans, you can select only # some MBeans matching the object name filter #object.name=org.apache.camel:context=*,type=routes connect to the MBean server. It’s only required if the MBean server is secured. • the password property contains the password to connect to the MBean server. It’s only required if the MBean server is secured

Storage 538 Append-Optimized Storage 538 To create a heap table 538 Choosing Row or Column-Oriented Storage 539 To create a column-oriented table 540 Using Compression (Append-Optimized Tables Only) 540 To To create a compressed table 541 Checking the Compression and Distribution of an Append-Optimized Table 541 Support for Run-length Encoding 542 Adding Column-level Compression 542 VMware Tanzu Greenplum Starting Greenplum Database 990 Restarting Greenplum Database 990 Reloading Configuration File Changes Only 990 Starting the Master in Maintenance Mode 990 Stopping Greenplum Database 991 Stopping Client Processes

the piles, and from it takes as many counters as he chooses; one, two, ..., or the whole pile. The only essential things about a play are that counters shall be taken from a single pile, and that at least legal moves, because for each pile there are a finite amount of counters to take. This means there are only so many moves that can be made. Since counters have to be removed for each move, the game cannot go the players control different pieces on the board which break the fourth rule, since each player can only move their own pieces. In Ludo there are more than 2 players, each player has their own pieces, and

different Index (GH7088). Previously the index was unintentionally sorted. • Arithmetic operations with only bool dtypes now give a warning indicating that they are evaluated in Python space for +, -, and * preview of head and tail in both dimensions. • allow option ’truncate’ for display.show_dimensions to only show the dimensions if the frame is truncated (GH6547). The default for display.show_dimensions will of SQLAlchemy on included dialects). The functionality of providing DBAPI connection objects will only be supported for sqlite3 in the future. The ’mysql’ flavor is deprecated. The new functions read_sql_query()

taking place on improving the docs, and a new Contributing section has been added. • Even though it may only be of interest to devs, we <3 our new CI status page: ScatterCI. 3 pandas: powerful Python data subclass NDFrame, similar to the rest of the pandas containers. This should be a transparent change with only very limited API implications. See Internal Refactoring 1.2.1 API changes • read_excel now supports loc[:,’A’] In [17]: dfi Out[17]: A B C 0 0 1 0 1 2 3 2 2 4 5 4 [3 rows x 3 columns] This is like an append operation. In [18]: dfi.loc[3] = 5 In [19]: dfi Out[19]: A B C 0 0 1 0 1 2 3 2 2 4 5 4 3 5 5 5 [4

Categories (3, object): [a < b < c] In [5]: cat.unique() Out[5]: array([’a’, ’b’, ’c’], dtype=object) Now, only the categories that do effectively occur in the array are returned: In [9]: cat = pd.Categorical([’a’ Timedelta now supports arithemtic with numpy.ndarray objects of the appropriate dtype (numpy 1.8 or newer only) (GH8884). 6 Chapter 1. What’s New pandas: powerful Python data analysis toolkit, Release 0.15.2 TypeError rather than ValueError (a couple of edge cases only), (GH8865) • Bug in using a pd.Grouper(key=...) with no level/axis or level only (GH8795, GH8866) • Report a TypeError when invalid/no paramaters

plot.scatter df.plot.bar df.plot.box df.plot.hexbin df.plot.kde df.plot.pie Each method signature only includes relevant arguments. Currently, these are limited to required arguments, but in the future option will affect the performance for printing of DataFrame and Series (about 2 times slower). Use only when it is actually required. Some East Asian countries use Unicode characters its width is corresponding on the values (GH8790) Observation Origin _merge value Merge key only in ’left’ frame left_only Merge key only in ’right’ frame right_only Merge key in both frames both In [40]: df1 = pd.DataFrame({'col1':[0

values of these types more deeply. Many official and unofficial Go tutorials are very simple and only cover the general use cases by ignoring many details. This may be good to encourage new Go programmers Go is a compiled and static typed programming language, Go also has many features which are usually only available in dynamic script languages. It is hard to combine these two kinds into one language, but ignored by Go Toolchain. ## More go Subcommands The three commands, go run, go build and go install, only output code syntax errors (if any). They don't (try to) output code warnings (a.k.a., possible

332 16 Configuration 337 16.1 Download cache 337 17 Howtos 339 17.1 How to package header-only libraries 339 17.2 How to launch conan install from cmake 341 17.3 How to create and reuse packages 92190322814016b0189a13/p15_1.jpg) Installation of packages from servers is also very efficient. Only the necessary binaries for the current platform and configuration are downloaded, not all of them and packages relying on the incorrect behavior of such bugs will be considered already broken. • Only documented features are considered part of the public interface of Conan. Private implementation details