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HBase与Java 8和zookeeper存在问题(HBase has issues with Java 8 and zookeeper)

 我想安装hbase 1.2.4。 当我尝试运行bin/start-hbase.sh我收到以下警告。  
OpenJDK 64-Bit Server VM warning: ignoring option PermSize=128m; support was removed in 8.0
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0'
 
 hbase shell命令生成大量众所周知的zookeeper异常......  
ERROR [main] zookeeper.RecoverableZooKeeper: ZooKeeper exists failed after 4 attempts
WARN  [main] zookeeper.ZKUtil: hconnection-0x1a96d94c0x0, quorum=localhost:2181, baseZNode=/hbase Unable to set watcher on znode (/hbase/hbaseid)

org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase/hbaseid
at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045)
.....
.....
 
 Hadoop已经在运行。 hbase-site.xml包含以下内容。  
   <property>
      <name>hbase.rootdir</name>
      <value>file:///usr/local/hbase</value>
   </property>
   <property>
      <name>hbase.zookeeper.property.dataDir</name>
      <value>/usr/local/hbase/zookeeper</value>
   </property>
   <property>
       <name>zookeeper.znode.parent</name>
       <value>/hbase</value>
   </property>
 
 可能的解决方案是什么？ 关于VM的Java警告实际上是重要还是可以忽略？ 

I want to install hbase 1.2.4. When I try to run bin/start-hbase.sh I get the following warnings. 
OpenJDK 64-Bit Server VM warning: ignoring option PermSize=128m; support was removed in 8.0
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0'
 
The hbase shell command generates a huge number of the well known zookeeper exceptions...  
ERROR [main] zookeeper.RecoverableZooKeeper: ZooKeeper exists failed after 4 attempts
WARN  [main] zookeeper.ZKUtil: hconnection-0x1a96d94c0x0, quorum=localhost:2181, baseZNode=/hbase Unable to set watcher on znode (/hbase/hbaseid)

org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase/hbaseid
at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045)
.....
.....
 
Hadoop is already running. hbase-site.xml contains the following. 
   <property>
      <name>hbase.rootdir</name>
      <value>file:///usr/local/hbase</value>
   </property>
   <property>
      <name>hbase.zookeeper.property.dataDir</name>
      <value>/usr/local/hbase/zookeeper</value>
   </property>
   <property>
       <name>zookeeper.znode.parent</name>
       <value>/hbase</value>
   </property>
 
What could be the possible solution? Do the Java warnings about VM actually matter or could be ignored? 

原文：https://stackoverflow.com/questions/41522002

更新时间：2022-12-16 16:12

最满意答案

 有关旋转矩阵的详细解释，请参阅此信息性维基百科文章 。 当旋转90度时，我们注意到cos 90折叠为零，产生以下简单变换，其中x'和y'是旋转坐标， x和y是前一个坐标。  
x' = -y
y' = x
 
 在您的示例中应用此简单替换会产生以下代码。 我还使用了速记集合初始化表达式来增加可读性。  
var points = new[]
{
    new Point(-(int) top, (int) top),
    new Point((int) -(top + HEIGHT), (int) top - WIDTH/2),
    new Point((int) -(top + HEIGHT), (int) top + WIDTH/2)
};

paper.FillPolygon(normalBrush, points);
 
 我还建议阅读使用例如Anton Rorres 等人的线性代数。 

See this informative Wikipedia article for a great explanation of rotation matrices. When rotating 90 degrees we note that cos 90 collapses into zero yielding the following simple transformation where x' and y' are your rotated coordinates and x and y are the previous coordinates. 
x' = -y
y' = x
 
Applying this simple replacement on your example yields the following code. I've also used a shorthand collection initializer expression for added readability. 
var points = new[]
{
    new Point(-(int) top, (int) top),
    new Point((int) -(top + HEIGHT), (int) top - WIDTH/2),
    new Point((int) -(top + HEIGHT), (int) top + WIDTH/2)
};

paper.FillPolygon(normalBrush, points);
 
I also recommend reading up on linear algebra using for example Anton Rorres, et al.

HBase与Java 8和zookeeper存在问题(HBase has issues with Java 8 and zookeeper)

最满意答案

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