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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1516) HClient fails to readjust when ROOT or META redeployed on new region server
Date Tue, 24 Jul 2007 05:19:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12514854

stack commented on HADOOP-1516:

Patch looks good Jim.

In HClient#findServersForTable you have:

+        for (int tries = 0; tries < 2; tries++) {

in two places.  Any reason for not using HClient#numRetries rather than a hard-coded '2'?
 (Same later in scanOneMetaRegion -- is there a copy paste error here because you are checking
numRetries later, low in the loop -- search for '+        if(servers.size() == 0 &&
tries == numRetries - 1) {')  Or if a reason, any reason for not making it configurable?

This is a little interesting:

+  volatile AtomicInteger numberOfMetaRegions;

Its interesting because the Atomic*s are described as extensions of volatile.  Volatile is
not needed here as assignment of the new AtomicInteger is done in the constructor so its initialization
should be thread-safe.

> HClient fails to readjust when ROOT or META redeployed on new region server
> ---------------------------------------------------------------------------
>                 Key: HADOOP-1516
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1516
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.15.0
>            Reporter: stack
>            Assignee: Jim Kellerman
>             Fix For: 0.15.0
>         Attachments: patch.txt, patch.txt, patch.txt
> Trying to add assertions about state to the test of region server clean shutdown and
aborts, I notice that subsequent to ROOT and META regions moving to fresh region server, any
attempt by the client to get actual content from the new locations fails with ConnectException
trying to fetch from the closed region server.

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