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Posted to hdfs-issues@hadoop.apache.org by "Eli Collins (JIRA)" <ji...@apache.org> on 2011/06/23 19:41:48 UTC
[jira] [Closed] (HDFS-2103) Read lock must be released before
acquiring a write lock
[ https://issues.apache.org/jira/browse/HDFS-2103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eli Collins closed HDFS-2103.
-----------------------------
> Read lock must be released before acquiring a write lock
> --------------------------------------------------------
>
> Key: HDFS-2103
> URL: https://issues.apache.org/jira/browse/HDFS-2103
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.23.0
> Reporter: Bharath Mundlapudi
> Assignee: Bharath Mundlapudi
> Fix For: 0.23.0
>
>
> In FSNamesystem.getBlockLocationsUpdateTimes function, we have the following code:
> {code}
> for (int attempt = 0; attempt < 2; attempt++) {
> if (attempt == 0) { // first attempt is with readlock
> readLock();
> } else { // second attempt is with write lock
> writeLock(); // writelock is needed to set accesstime
> }
> ...
> if (attempt == 0) {
> continue;
> }
> {code}
> In the above code, readLock is acquired in attempt 0 and if the execution enters in the continue block, then it tries to acquire writeLock before releasing the readLock.
>
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