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From "Hiroshi Ikeda (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6651) Improve thread safety of HTablePool
Date Fri, 28 Mar 2014 05:57:19 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Hiroshi Ikeda updated HBASE-6651:

    Attachment: HBASE-6651-V15-trunk.patch

Added fixed patches.

I had forgot to add the license header to one of the added classes, so I fixed it. Also I
changed InterfaceAudience of the added classes to be Private.

> Improve thread safety of HTablePool
> -----------------------------------
>                 Key: HBASE-6651
>                 URL: https://issues.apache.org/jira/browse/HBASE-6651
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 0.94.1
>            Reporter: Hiroshi Ikeda
>            Assignee: Hiroshi Ikeda
>         Attachments: HBASE-6651-V10.patch, HBASE-6651-V11.patch, HBASE-6651-V12.patch,
HBASE-6651-V13.patch, HBASE-6651-V14-0.96.patch, HBASE-6651-V14-0.98.patch, HBASE-6651-V14-trunk.patch,
HBASE-6651-V15-0.96.patch, HBASE-6651-V15-0.98.patch, HBASE-6651-V15-trunk.patch, HBASE-6651-V2.patch,
HBASE-6651-V3.patch, HBASE-6651-V4.patch, HBASE-6651-V5.patch, HBASE-6651-V6.patch, HBASE-6651-V7.patch,
HBASE-6651-V8.patch, HBASE-6651-V9.patch, HBASE-6651.patch, sample.zip, sample.zip, sharedmap_for_hbaseclient.zip
> There are some operations in HTablePool accessing PoolMap in multiple places without
any explicit synchronization. 
> For example HTablePool.closeTablePool() calls PoolMap.values(), and calls PoolMap.remove().
If other threads add new instances to the pool in the middle of the calls, the newly added
instances might be dropped. (HTablePool.closeTablePool() also has another problem that calling
it by multiple threads causes accessing HTable by multiple threads.)
> Moreover, PoolMap is not thread safe for the same reason.
> For example PoolMap.put() calles ConcurrentMap.get() and calles ConcurrentMap.put().
If other threads add a new instance to the concurent map in the middle of the calls, the new
instance might be dropped.
> And also implementations of Pool have the same problems.

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