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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7165) Separate block metrics for files with replication count 1
Date Mon, 20 Oct 2014 20:01:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14177400#comment-14177400

Andrew Wang commented on HDFS-7165:

Almost there, thanks for revving Zhe.

* In ClientProtocol#getStats, it mentions "total used space of the block pool", and I see
that being set in HeartbeatManager, but AFAICT it's dropped in the PB layer on the server
side. If it's not being used, let's remove it. If not, it's a compat issue to insert something
at an already-being-used index of the stats array.
* TestMissingBlocksAlert still has a whitespace-only change. Line 79-80 were deleted.
* TestUnderReplicatedBlockQueues, the extend:

public class TestUnderReplicatedBlockQueues extends Assert {

We should not "extends Assert" in test cases. Instead, let's add static imports on the various
Asserts being used. Let's undo the assertInLevel changes too, using {{fail}} as it was before
was good.

> Separate block metrics for files with replication count 1
> ---------------------------------------------------------
>                 Key: HDFS-7165
>                 URL: https://issues.apache.org/jira/browse/HDFS-7165
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Andrew Wang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-7165-20141003-v1.patch, HDFS-7165-20141009-v1.patch, HDFS-7165-20141010-v1.patch,
> We see a lot of escalations because someone has written teragen output with a replication
factor of 1, a DN goes down, and a bunch of missing blocks show up. These are normally false
positives, since teragen output is disposable, and generally speaking, users should understand
this is true for all repl=1 files.
> It'd be nice to be able to separate out these repl=1 missing blocks from missing blocks
with higher replication factors..

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