Minwoo Kang mwkang
mwkang
/ StaticHostProvider.java
Created
February 21, 2017 06:24
java client does a reverse dns lookup when connecting
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| Index: src/java/main/org/apache/zookeeper/client/StaticHostProvider.java | |
| =================================================================== | |
| --- src/java/main/org/apache/zookeeper/client/StaticHostProvider.java (revision 1450278) | |
| +++ src/java/main/org/apache/zookeeper/client/StaticHostProvider.java (working copy) | |
| @@ -116,8 +116,7 @@ | |
| InetAddress resolvedAddresses[] = InetAddress.getAllByName((ia!=null) ? ia.getHostAddress(): | |
| address.getHostName()); | |
| for (InetAddress resolvedAddress : resolvedAddresses) { | |
| - tmpList.add(new InetSocketAddress(resolvedAddress | |
| - .getHostAddress(), address.getPort())); |
mwkang
/ ExploringCompactionPolicy#isBetterSelection.java
Last active
September 14, 2016 11:58
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| private boolean isBetterSelection(List<StoreFile> bestSelection, | |
| long bestSize, List<StoreFile> selection, long size, boolean mightBeStuck) { | |
| if (mightBeStuck && bestSize > 0 && size > 0) { | |
| // Keep the selection that removes most files for least size. That penaltizes adding | |
| // large files to compaction, but not small files, so we don't become totally inefficient | |
| // (might want to tweak that in future). Also, given the current order of looking at | |
| // permutations, prefer earlier files and smaller selection if the difference is small. | |
| final double REPLACE_IF_BETTER_BY = 1.05; | |
| double thresholdQuality = ((double)bestSelection.size() / bestSize) * REPLACE_IF_BETTER_BY; | |
| return thresholdQuality < ((double)selection.size() / size); |
mwkang
/ all kill jps
Last active
December 14, 2017 04:16
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| jps | awk '$2 != "Jps" {print $1}' | xargs kill |
mwkang
/ Waiting...Fatal error: watch ENOSPC
Created
August 10, 2016 04:45
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| echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p |
mwkang
/ Zeppelin Error
Created
August 10, 2016 03:46
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| [INFO] Zeppelin ........................................... |
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| 2016-08-02 11:34:31,836 ERROR [main] zookeeper.ZooKeeperWatcher: hconnection-0x6c302a1d0x0, quorum=localhost:2181, baseZNode=/hbase Received unexpected KeeperException, re-throwing exception | |
| org.apache.zookeeper.KeeperException$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:1102) | |
| at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:220) | |
| at org.apache.hadoop.hbase.zookeeper.ZKUtil.checkExists(ZKUtil.java:416) | |
| at org.apache.hadoop.hbase.zookeeper.ZKClusterId.readClusterIdZNode(ZKClusterId.java:65) | |
| at org.apache.hadoop.hbase.client.ZooKeeperRegistry.getClusterId(ZooKeeperRegistry.java:102) | |
| at org.apache.hadoop.hbase.client.ConnectionImplementation.retrieveClusterId(ConnectionImplementation.java:443) |
mwkang
/ org.apache.zeppelin.interpreter.LazyOpenInterpreter#getProgress
Last active
August 9, 2016 04:15
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| @Override | |
| public int getProgress(InterpreterContext context) { | |
| open(); | |
| return intp.getProgress(context); | |
| } |
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| { | |
| List<String> set = Lists.newArrayList(); | |
| for (int i = 0; i < 5; i++) { | |
| String a = new String("a"); | |
| String b = "a"; | |
| System.out.println(System.identityHashCode(a)); | |
| System.out.println(System.identityHashCode(b)); | |
| set.add("c"); | |
| System.out.println("?? =====> " + System.identityHashCode(set.get(0))); | |
| set.clear(); |
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| sudo gem install -n /usr/local/bin GEM_NAME_HERE |
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| GEM_HOME=/usr/local/bin |
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