HBASE-20557 Backport HBASE-17215 to branch-1

[taklwu]

The second backport of HBASE-20555

[taklwu]

please see the original commit 9facfa550f1e7386be3a04d84f7e8013f5002965 of the master branch

ran mvn clean install -DskipTest, executed unit test TestHFileCleaner and executed mvn test with hbase-server successfully (all with java 8), pinged on HBASE-20557

...
[INFO] Running org.apache.hadoop.hbase.mapreduce.TestHRegionPartitioner
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.559 s - in org.apache.hadoop.hbase.mapreduce.TestHRegionPartitioner
[INFO] Tests run: 12, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 121.848 s - in org.apache.hadoop.hbase.mapreduce.TestImportExport
[INFO] 
[INFO] Results:
[INFO] 
[WARNING] Tests run: 1837, Failures: 0, Errors: 0, Skipped: 17
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:42 h
[INFO] Finished at: 2018-06-23T18:07:51Z
[INFO] ------------------------------------------------------------------------

[z-york]

Can you fix the import order checkstyle warning?

[taklwu]

I tried to used the hbase_eclipse_formatter.xml and followed the setting in hbase-checkstyle/src/main/resources/hbase/checkstyle.xml, submitted a new patch for reorganizing the imports. However, it's not working as expected and I don't know what is missing from the checkstyle, you can also see those non-changed classes MergeNormalizationPlan and SplitNormalizationPlan is importing correctly as well but failed with the same issue, I'm wondered if I'm hitting a bug or something for checkstyle, I need more time to look into it but if you can point out the problem that would be helpful

  [ERROR] /local/home/wutaklon/workspace-tmp/hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/MergeNormalizationPlan.java:27: Wrong order for 'java.io.IOException' import. [ImportOrder]
  [ERROR] /local/home/wutaklon/workspace-tmp/hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SplitNormalizationPlan.java:27: Wrong order for 'java.io.IOException' import. [ImportOrder]
...
[ERROR] /local/home/wutaklon/workspace-tmp/hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/master/cleaner/HFileCleaner.java:33: Wrong order for 'java.io.IOException' import. [ImportOrder]

[taklwu]

I figured it out at the end that checkstyle of the IDE in hbase_eclipse_formatter.xml and checkstyle while running maven-checkstyle-plugin with conf in hbase-checkstyle/src/main/resources/hbase/checkstyle.xml do not match.

with the following the imports order will pass checkstyle in HFileCleaner.java

import com.google.common.annotations.VisibleForTesting;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Stoppable;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.conf.ConfigurationObserver;
import org.apache.hadoop.hbase.io.HFileLink;
import org.apache.hadoop.hbase.regionserver.StoreFileInfo;

So, I'm wondered if we should have an separate JIRA (I will open it and fix it) to fix and sync between these two setting files (with HBASE-19262 and HBASE-19552) still does not work well, so we need to backport it branch-1 and also fix the problem we found here.

For this changes, I personally see the current commit matched what hbase_eclipse_formatter.xml setup, so, it's safe to commit. but if you insist we need to fix it within this PR, please let me know if we should fix it here instead of a new JIRA/PR.

[z-york]

Let's update the order related to the checkstyle.xml for now and open a JIRA to discuss this mismatch.

[taklwu]

sure, I have done that by updated the commit and patch on the HBASE-20557, the latest auto-build showed that the checkstyle has been passed.

[z-york]

Confirmed it is the same change.

[z-york]

It's weird that this wants it all in one block... but if checkstyle likes it who am I to disagree? :)

[taklwu]

any update ? do I need to change anything else?

[z-york]

merged. @busbey how can I close the PR? It looks like I don't have the permissions required.

[taklwu]

this has been merged as a52c6bf