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https://issues.apache.org/jira/browse/HDFS-14158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16744579#comment-16744579
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Akira Ajisaka commented on HDFS-14158:
--------------------------------------
{code}
if(now >= lastCheckpointTime + periodMSec) {
shouldCheckpoint = true;
} else {
{code}
Sorry I missed that periodMSec is used for not only sleep time but also
checkpoint interval.
bq. Timo Walter, I suggest take a look at the patch in HDFS-1572 and
incorporate the logic to yours if makes sense.
+1, thanks [~kihwal] for the suggestion.
> Checkpointer ignores configured time period > 5 minutes
> -------------------------------------------------------
>
> Key: HDFS-14158
> URL: https://issues.apache.org/jira/browse/HDFS-14158
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.8.1
> Reporter: Timo Walter
> Priority: Minor
> Labels: checkpoint, hdfs, namenode
>
> The checkpointer always triggers a checkpoint every 5 minutes and ignores the
> flag "*dfs.namenode.checkpoint.period*", if its greater than 5 minutes.
> See the code below (in Checkpointer.java):
> {code:java}
> //Main work loop of the Checkpointer
> public void run() {
> // Check the size of the edit log once every 5 minutes.
> long periodMSec = 5 * 60; // 5 minutes
> if(checkpointConf.getPeriod() < periodMSec) {
> periodMSec = checkpointConf.getPeriod();
> }
> {code}
> If the configured period ("*dfs.namenode.checkpoint.period*") is lower than 5
> minutes, you choose use the configured one. But it always ignores it, if it's
> greater than 5 minutes.
>
> In my opinion, the if-expression should be:
> {code:java}
> if(checkpointConf.getPeriod() > periodMSec) {
> periodMSec = checkpointConf.getPeriod();
> }
> {code}
>
> Then "*dfs.namenode.checkpoint.period*" won't get ignored.
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