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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12043) Add counters for block re-replication
Date Mon, 26 Jun 2017 20:50:00 GMT
Chen Liang created HDFS-12043:
---------------------------------

             Summary: Add counters for block re-replication
                 Key: HDFS-12043
                 URL: https://issues.apache.org/jira/browse/HDFS-12043
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Chen Liang
            Assignee: Chen Liang


We occasionally see that the under-replicated block count is not going down quickly enough.
We've made at least one fix to speed up block replications (HDFS-9205) but we need better
insight into the current state and activity of the block re-replication logic. For example,
we need to understand whether is it because re-replication is not making forward progress
at all, or is it because new under-replicated blocks are being added faster.

We should include additional metrics:
# Cumulative number of blocks that were successfully replicated. 
# Cumulative number of re-replications that timed out.
# Cumulative number of blocks that were dequeued for re-replication but not scheduled e.g.
because they were invalid, or under-construction or replication was postponed.
 
The growth rate of of the above metrics will make it clear whether block replication is making
forward progress and if not then provide potential clues about why it is stalled.

Thanks [~arpitagarwal] for the offline discussions.




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