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https://issues.apache.org/jira/browse/HBASE-9467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17252459#comment-17252459
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Mark Latham commented on HBASE-9467:
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*Mark L Latham*
0. [https://robertgladden.gitbook.io/robert-gladden-statement/]
1. [https://robertgladden.gitbook.io/personal-statement/]
2. [https://robertgladden.gitbook.io/my-statement/]
3. [https://robertgladden.gitbook.io/fashionable-black-platform-bed/]
4. [https://robertgladden.gitbook.io/casshina-platform-bed/]
5. [https://robertgladden.gitbook.io/nyx-bed-frame/]
6. [https://robertgladden.gitbook.io/poliform-bed-frame/]
7. [https://www.leetchi.com/c/living-and-platform-bed]
8. [https://www.leetchi.com/c/no-head-if-you-choose-a-bed]
9. [https://www.leetchi.com/c/disadvantages-of-headless-beds]
10. [https://www.leetchi.com/c/choose-a-bed-without-a-headboard]
11. [https://note.com/marklatham/n/n27c1074ab519]
12. [https://note.com/marklatham/n/n60e3bfbd4a6e]
13. [https://note.com/marklatham/n/n5786d7fa4da5]
14. [https://note.com/marklatham/n/n1fd28ac31cb7]
15. [https://note.com/marklatham/n/nb936c8ab5b56]
16. [https://note.com/marklatham/n/n81e0a513af2e]
17. [https://note.com/marklatham/n/n75366750e7b5]
> write can be totally blocked temporarily by a write-heavy region
> ----------------------------------------------------------------
>
> Key: HBASE-9467
> URL: https://issues.apache.org/jira/browse/HBASE-9467
> Project: HBase
> Issue Type: Improvement
> Reporter: Honghua Feng
> Assignee: Honghua Feng
> Priority: Major
> Fix For: 0.98.0, 0.96.0
>
> Attachments: HBASE-9467-trunk-v0.patch, HBASE-9467-trunk-v1.patch,
> HBASE-9467-trunk-v1.patch, HBASE-9467-trunk-v1.patch
>
>
> Write to a region can be blocked temporarily if the memstore of that region
> reaches the threshold(hbase.hregion.memstore.block.multiplier *
> hbase.hregion.flush.size) until the memstore of that region is flushed.
> For a write-heavy region, if its write requests saturates all the handler
> threads of that RS when write blocking for that region occurs, requests of
> other regions/tables to that RS also can't be served due to no available
> handler threads...until the pending writes of that write-heavy region are
> served after the flush is done. Hence during this time period, from the RS
> perspective it can't serve any request from any table/region just due to a
> single write-heavy region.
> This sounds not very reasonable, right? Maybe write requests from a region
> can only be served by a sub-set of the handler threads, and then write
> blocking of any single region can't lead to the scenario mentioned above?
> Comment?
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