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Re: Juggling or swaping out the standby NameNode in a QJM / HA configuration - Hadoop - [mail # user]
...Hi Colin,    I guess currently we may have to restart almost all thedaemons/services in order to swap out a standby NameNode (SBN):1. The current active NameNode (ANN) needs t...
   Author: Jing Zhao, 2014-07-31, 18:20
[HADOOP-10630] Possible race condition in RetryInvocationHandler - Hadoop - [issue]
...In one of our system tests with NameNode HA setup, we ran 300 threads in LoadGenerator. While one of the NameNodes was already in the active state and started to serve, we still saw one of t...
http://issues.apache.org/jira/browse/HADOOP-10630    Author: Jing Zhao, 2014-06-03, 16:54
[HADOOP-10627] Add documentation for http/https policy configuration/setup - Hadoop - [issue]
...HADOOP-10022/HDFS-5305 etc. adds new http/https policy support in HDFS and Yarn. We should have documentation for its configuration and setup....
http://issues.apache.org/jira/browse/HADOOP-10627    Author: Jing Zhao, 2014-05-22, 18:53
[HADOOP-10608] Support incremental data copy in DistCp - Hadoop - [issue]
...Currently when doing distcp with -update option, for two files with the same file names but with different file length or checksum, we overwrite the whole file. It will be good if we can det...
http://issues.apache.org/jira/browse/HADOOP-10608    Author: Jing Zhao, 2014-05-21, 09:31
[HADOOP-10489] UserGroupInformation#getTokens and UserGroupInformation#addToken can lead to ConcurrentModificationException - Hadoop - [issue]
...Currently UserGroupInformation#getTokens and UserGroupInformation#addToken uses UGI's monitor to protect the iteration and modification of Credentials#tokenMap. Per discussion in HADOOP-1047...
http://issues.apache.org/jira/browse/HADOOP-10489    Author: Jing Zhao, 2014-05-20, 16:37
[HADOOP-10535] Make the retry numbers in ActiveStandbyElector configurable - Hadoop - [issue]
...Currently in ActiveStandbyElector, when its zookeeper client cannot successfully communicate with ZooKeeper service, the retry number is hard coded to 3 (ActiveStandbyElector#NUM_RETRIES). A...
http://issues.apache.org/jira/browse/HADOOP-10535    Author: Jing Zhao, 2014-04-25, 14:40
[HADOOP-10472] KerberosAuthenticator should use org.apache.commons.logging.LogFactory instead of org.slf4j.LoggerFactory - Hadoop - [issue]
http://issues.apache.org/jira/browse/HADOOP-10472    Author: Jing Zhao, 2014-04-23, 00:49
Re: Applying delta between two HDFS snapshot using hdfs command - Hadoop - [mail # user]
...Hi Manoj,    You're right, right now we do not have a complete snapshotrollback/restore functionality in HDFS. Thus users have to manuallycopy/delete files according to the sn...
   Author: Jing Zhao, 2014-04-14, 21:47
[HADOOP-10441] Namenode metric "rpc.RetryCache/NameNodeRetryCache.CacheHit" can't be correctly processed by Ganglia - Hadoop - [issue]
...The issue is reported by Dmytro Sen:Recently added Namenode metric "rpc.RetryCache/NameNodeRetryCache.CacheHit" can't be correctly processed by Ganglia because its name contains "/"Proposal:...
http://issues.apache.org/jira/browse/HADOOP-10441    Author: Jing Zhao, 2014-03-27, 14:02
[HADOOP-10295] Allow distcp to automatically identify the checksum type of source files and use it for the target - Hadoop - [issue]
...Currently while doing distcp, users can use "-Ddfs.checksum.type" to specify the checksum type in the target FS. This works fine if all the source files are using the same checksum type. If ...
http://issues.apache.org/jira/browse/HADOOP-10295    Author: Jing Zhao, 2014-02-22, 00:21
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