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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8670) [0.94] Backport HBASE-8449 to 0.94 (Refactor recoverLease retries and pauses)
Date Fri, 31 May 2013 21:56:20 GMT
Enis Soztutar created HBASE-8670:

             Summary: [0.94] Backport HBASE-8449 to 0.94 (Refactor recoverLease retries and
                 Key: HBASE-8670
                 URL: https://issues.apache.org/jira/browse/HBASE-8670
             Project: HBase
          Issue Type: Bug
          Components: Filesystem Integration, master, wal
            Reporter: Enis Soztutar
            Assignee: Enis Soztutar
             Fix For: 0.94.9

Some history: 
 Up until 0.94.8, Hbase did not check the result of recoverLease() call, but things kind of
worked since we are checking for 0-length files in distributed log split tasks from region
servers. If lease recovery is not finished, the log file will report 0 length, and the task
will fail, and master will then re-call recoverLease() and reassign the task. This scheme
might fail for log files that are larger than 1 hdfs block though. 
 In 0.94.8, we committed (HBASE-8354, which is backport of HBASE-7878) and later increased
the sleep time to 4 secs in HBASE-8389. 
 However, the proper solution arrived in trunk in HBASE-8449 which uses a backoff sleep policy
+ isFileClosed() api. We should backport this patch to 0.94 as well. 

isFileClosed() is released in Hadoop 1.2.0 (HDFS-4774) and 2.0.5(HDFS-4525).

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