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From "BELUGA BEHR (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13994) DataNode BlockSender waitForMinLength
Date Thu, 18 Oct 2018 17:47:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13994?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

BELUGA BEHR updated HDFS-13994:
-------------------------------
    Status: Patch Available  (was: Open)

Submitted new patch.

> DataNode BlockSender waitForMinLength
> -------------------------------------
>
>                 Key: HDFS-13994
>                 URL: https://issues.apache.org/jira/browse/HDFS-13994
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 3.2.0
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Minor
>         Attachments: HDFS-13994.1.patch, HDFS-13994.2.patch, HDFS-13994.3.patch, HDFS-13994.4.patch
>
>
> {code:java|title=BlockSender.java}
>   private static void waitForMinLength(ReplicaInPipeline rbw, long len)
>       throws IOException {
>     // Wait for 3 seconds for rbw replica to reach the minimum length
>     for (int i = 0; i < 30 && rbw.getBytesOnDisk() < len; i++) {
>       try {
>         Thread.sleep(100);
>       } catch (InterruptedException ie) {
>         throw new IOException(ie);
>       }
>     }
>     long bytesOnDisk = rbw.getBytesOnDisk();
>     if (bytesOnDisk < len) {
>       throw new IOException(
>           String.format("Need %d bytes, but only %d bytes available", len,
>               bytesOnDisk));
>     }
>   }
>  {code}
> It is not very efficient to poll for status in this way.  Instead, use {{notifyAll}}
within the {{ReplicaInPipeline}} to notify the caller when the replica has reached a certain
size.



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