[ http://issues.apache.org/jira/browse/HADOOP-96?page=comments#action_12372598 ]
Yoram Arnon commented on HADOOP-96: ----------------------------------- OK. we'll use the current log formatter, and just turn on the output of thread id when we're debugging. > name server should log decisions that affect data: block creation, removal, > replication > --------------------------------------------------------------------------------------- > > Key: HADOOP-96 > URL: http://issues.apache.org/jira/browse/HADOOP-96 > Project: Hadoop > Type: Improvement > Components: dfs > Versions: 0.1 > Reporter: Yoram Arnon > Priority: Critical > > currently, there's no way to analyze and debug DFS errors where blocks > disapear. > name server should log its decisions that affect data, including block > creation, removal, replication: > - block <b> created, assigned to datanodes A, B, ... > - datanode A dead, block <b> underreplicated(1), replicating to datanode C > - datanode B dead, block <b> underreplicated(2), replicating to datanode D > - datanode A alive, block <b> overreplicated, removing from datanode D > - block <removed> from datanodes C, D, ... > that will enable me to track down, two weeks later, a block that's missing > from a file, and to debug the name server. > extra credit: > - rotate log file, as it might grow large > - make this behaviour optional/configurable -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
