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From "JongYoon Lim (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HAMA-971) An increment to a volatile field isn't atomic
Date Thu, 10 Sep 2015 07:37:45 GMT

     [ https://issues.apache.org/jira/browse/HAMA-971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

JongYoon Lim updated HAMA-971:
------------------------------
    Attachment: HAMA-971.patch

> An increment to a volatile field isn't atomic
> ---------------------------------------------
>
>                 Key: HAMA-971
>                 URL: https://issues.apache.org/jira/browse/HAMA-971
>             Project: Hama
>          Issue Type: Bug
>          Components: bsp core
>            Reporter: JongYoon Lim
>            Priority: Minor
>         Attachments: HAMA-971.patch
>
>
> I found a defect from FindBugs Analysis.
> {code}
> // AsyncRcvdMsgCheckpointImpl.java
> volatile private long checkpointMessageCount;
> ...
> ++checkpointMessageCount;
> {code}
> {code}
> // Server.java
> private volatile int rpcCount = 0; // number of outstanding rpcs
> ...
> rpcCount--;
> rpcCount++;
> {code}
> This code increments a volatile field. Increments of volatile fields aren't atomic. If
more than one thread is incrementing the field at the same time, increments could be lost.
> I think *AtomicInteger* and *AtomicLong* can be used instead of volatile fields. 



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