当kudu有tserver下线或者迁移或者修改hostname之后,旧的tserver会一直以dead状态出现,并且tserver日志中会有大量的连接重试日志,一天的错误日志会有几个G, W0322 22:13:59.202749 16927 tablet_service.cc:290] Invalid argument: UpdateConsensus: Wrong destination UUID requested. Local UUID: e2f80a1fcf0c47f6b7f220a4…

kudu 1.7 官方:https://kudu.apache.org/ 一 简介 kudu有很多概念,有分布式文件系统(HDFS),有一致性算法(Zookeeper),有Table(Hive Table),有Tablet(Hive Table Partition),有列式存储(Parquet),有顺序和随机读取(HBase),所以看起来kudu是一个轻量级的 HDFS + Zookeeper + Hive + Parquet + HBase,除此之外,kudu还有自己的特点,快速写入+读取,使…

kudu tserver占用内存过高后会拒绝部分写请求,日志如下: 19/06/01 13:34:12 INFO AsyncKuduClient: Invalidating location 34b1c13d04664cc8bae6689d39b08b77($kudu_tserver:7050) for tablet 858c055c456549569af77d14eaf997e5: Service unavailable: Soft memory limit exceeded (at 92.3…

kudu加减数据盘不能直接修改配置fs_data_dirs后重启,否则会报错: Check failed: _s.ok() Bad status: Already present: FS layout already exists; not overwriting existing layout: FSManager roots already exist: /data0/kudu/data 官方解释如下: When Kudu starts, it checks each configured…

关于kudu的primary key The primary key may not be changed after the table is created. You must drop and recreate a table to select a new primary key. 创建之后主键列不能变更 The columns which make up the primary key must be listed first in the schema. 否则会报错: ImpalaR…

spark2.4.3+kudu1.9 1 批量读 val df = spark.read.format("kudu") .options(Map("kudu.master" -> "master:7051", "kudu.table" -> "impala::test_db.test_table")) .load df.createOrReplaceTempView("tmp_tabl…

核心枚举 public enum ServerState { LOOKING, FOLLOWING, LEADING, OBSERVING; } zookeeper服务器状态:刚启动LOOKING,follower是FOLLOWING,leader是LEADING,observer是OBSERVING: public enum LearnerType { PARTICIPANT, OBSERVER; } 简单来说,zookeeper启动的核心类是QuorumPeerMain,启动之后会加载配置,…

对文件进行词频统计,是一个大数据领域的hello word级别的应用,来看下实现有多简单: 1 Linux单机处理 egrep -o "\b[[:alpha:]]+\b" test_word.log|sort|uniq -c|sort -rn|head -10 2 Spark分布式处理(Scala) val sparkConf = new SparkConf() val sc = new SparkContext(sparkConf) sc.textFile("test_wo…

impala2.12 官方:http://impala.apache.org/ 一 简介 Apache Impala is the open source, native analytic database for Apache Hadoop. Impala is shipped by Cloudera, MapR, Oracle, and Amazon. impala是hadoop上的开源分析性数据库:C++和java语言开发: Do BI-style Queries on Hadoop Im…

应用一:kafka数据同步到kudu 1 准备kafka topic # bin/kafka-topics.sh --zookeeper $zk:2181/kafka -create --topic test_sync --partitions 2 --replication-factor 2 WARNING: Due to limitations in metric names, topics with a period ('.') or underscore ('_') could coll…