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https://issues.apache.org/jira/browse/HBASE-5162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14249254#comment-14249254
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Hadoop QA commented on HBASE-5162:
----------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12687610/hbase-5162-trunk-addendum.patch
against master branch at commit 9e7f7211b95ef4e9c64f5e54411c7c9fa7eeb235.
ATTACHMENT ID: 12687610
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 3 new
or modified tests.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any
warning messages.
{color:green}+1 checkstyle{color}. The applied patch does not increase the
total number of checkstyle errors
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 lineLengths{color}. The patch does not introduce lines
longer than 100
{color:green}+1 site{color}. The mvn site goal succeeds with this patch.
{color:green}+1 core tests{color}. The patch passed unit tests in .
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Checkstyle Errors:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//artifact/patchprocess/checkstyle-aggregate.html
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/12101//console
This message is automatically generated.
> Basic client pushback mechanism
> -------------------------------
>
> Key: HBASE-5162
> URL: https://issues.apache.org/jira/browse/HBASE-5162
> Project: HBase
> Issue Type: New Feature
> Affects Versions: 0.92.0
> Reporter: Jean-Daniel Cryans
> Assignee: Jesse Yates
> Fix For: 1.0.0, 2.0.0
>
> Attachments: hbase-5162-branch-1-v0.patch,
> hbase-5162-trunk-addendum.patch, hbase-5162-trunk-v0.patch,
> hbase-5162-trunk-v1.patch, hbase-5162-trunk-v10.patch,
> hbase-5162-trunk-v11.patch, hbase-5162-trunk-v12-committed.patch,
> hbase-5162-trunk-v2.patch, hbase-5162-trunk-v3.patch,
> hbase-5162-trunk-v4.patch, hbase-5162-trunk-v5.patch,
> hbase-5162-trunk-v6.patch, hbase-5162-trunk-v7.patch,
> hbase-5162-trunk-v8.patch, java_HBASE-5162.patch
>
>
> The current blocking we do when we are close to some limits (memstores over
> the multiplier factor, too many store files, global memstore memory) is bad,
> too coarse and confusing. After hitting HBASE-5161, it really becomes obvious
> that we need something better.
> I did a little brainstorm with Stack, we came up quickly with two solutions:
> - Send some exception to the client, like OverloadedException, that's thrown
> when some situation happens like getting past the low memory barrier. It
> would be thrown when the client gets a handler and does some check while
> putting or deleting. The client would treat this a retryable exception but
> ideally wouldn't check .META. for a new location. It could be fancy and have
> multiple levels of pushback, like send the exception to 25% of the clients,
> and then go up if the situation persists. Should be "easy" to implement but
> we'll be using a lot more IO to send the payload over and over again (but at
> least it wouldn't sit in the RS's memory).
> - Send a message alongside a successful put or delete to tell the client to
> slow down a little, this way we don't have to do back and forth with the
> payload between the client and the server. It's a cleaner (I think) but more
> involved solution.
> In every case the RS should do very obvious things to notify the operators of
> this situation, through logs, web UI, metrics, etc.
> Other ideas?
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