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https://issues.apache.org/jira/browse/HDFS-8356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217275#comment-15217275
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Akira AJISAKA commented on HDFS-8356:
-------------------------------------

Thanks [~rchiang] for the update. One comment from me.
* In dfs.namenode.replication.pending.timeout-sec, I'm thinking the timeout is 
not capped at 300 seconds.
{code}
          if (now > pendingBlock.getTimeStamp() + timeout) {
            BlockInfo block = entry.getKey();
            synchronized (timedOutItems) {
              timedOutItems.add(block);
            }
{code}
The interval between scans is capped.
{code}
        long period = Math.min(DEFAULT_RECHECK_INTERVAL, timeout);
        try {
          pendingReplicationCheck();
          Thread.sleep(period);
{code}

> Document missing properties in hdfs-default.xml
> -----------------------------------------------
>
>                 Key: HDFS-8356
>                 URL: https://issues.apache.org/jira/browse/HDFS-8356
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 2.7.0
>            Reporter: Ray Chiang
>            Assignee: Ray Chiang
>              Labels: supportability, test
>         Attachments: HDFS-8356.001.patch, HDFS-8356.002.patch, 
> HDFS-8356.003.patch, HDFS-8356.004.patch, HDFS-8356.005.patch, 
> HDFS-8356.006.patch, HDFS-8356.007.patch, HDFS-8356.008.patch, 
> HDFS-8356.009.patch, HDFS-8356.010.patch, HDFS-8356.011.patch
>
>
> The following properties are currently not defined in hdfs-default.xml. These 
> properties should either be
> A) documented in hdfs-default.xml OR
> B) listed as an exception (with comments, e.g. for internal use) in the 
> TestHdfsConfigFields unit test



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