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https://issues.apache.org/jira/browse/HDFS-15820?focusedWorklogId=547784&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-547784
]
ASF GitHub Bot logged work on HDFS-15820:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Feb/21 19:02
Start Date: 04/Feb/21 19:02
Worklog Time Spent: 10m
Work Description: smengcl commented on a change in pull request #2682:
URL: https://github.com/apache/hadoop/pull/2682#discussion_r570461526
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
##########
@@ -8531,25 +8527,37 @@ void checkAccess(String src, FsAction mode) throws
IOException {
* Check if snapshot roots are created for all existing snapshottable
* directories. Create them if not.
*/
- void checkAndProvisionSnapshotTrashRoots() throws IOException {
- SnapshottableDirectoryStatus[] dirStatusList =
getSnapshottableDirListing();
- if (dirStatusList == null) {
- return;
- }
- for (SnapshottableDirectoryStatus dirStatus : dirStatusList) {
- String currDir = dirStatus.getFullPath().toString();
- if (!currDir.endsWith(Path.SEPARATOR)) {
- currDir += Path.SEPARATOR;
- }
- String trashPath = currDir + FileSystem.TRASH_PREFIX;
- HdfsFileStatus fileStatus = getFileInfo(trashPath, false, false, false);
- if (fileStatus == null) {
- LOG.info("Trash doesn't exist for snapshottable directory {}. "
- + "Creating trash at {}", currDir, trashPath);
- PermissionStatus permissionStatus = new
PermissionStatus(getRemoteUser()
- .getShortUserName(), null, SHARED_TRASH_PERMISSION);
- mkdirs(trashPath, permissionStatus, false);
+ @Override
+ public void checkAndProvisionSnapshotTrashRoots() {
+ if (isSnapshotTrashRootEnabled) {
+ try {
+ SnapshottableDirectoryStatus[] dirStatusList =
+ getSnapshottableDirListing();
+ if (dirStatusList == null) {
+ return;
+ }
+ for (SnapshottableDirectoryStatus dirStatus : dirStatusList) {
+ String currDir = dirStatus.getFullPath().toString();
+ if (!currDir.endsWith(Path.SEPARATOR)) {
+ currDir += Path.SEPARATOR;
+ }
+ String trashPath = currDir + FileSystem.TRASH_PREFIX;
+ HdfsFileStatus fileStatus = getFileInfo(trashPath, false, false,
false);
+ if (fileStatus == null) {
+ LOG.info("Trash doesn't exist for snapshottable directory {}. " +
"Creating trash at {}", currDir, trashPath);
+ PermissionStatus permissionStatus =
+ new PermissionStatus(getRemoteUser().getShortUserName(), null,
+ SHARED_TRASH_PERMISSION);
+ mkdirs(trashPath, permissionStatus, false);
+ }
+ }
+ } catch (IOException e) {
+ final String msg =
+ "Could not provision Trash directory for existing "
+ + "snapshottable directories. Exiting Namenode.";
+ ExitUtil.terminate(1, msg);
Review comment:
Pro: Terminating NN in this case is a sure good way of uncovering an
unexpected problems instead of hiding it in the logs.
Con: I wonder if we really should terminate NN when Trash directory fails to
be deployed. We could just throw a warning message?
Either way, I'm fine with both. Just a thought.
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java
##########
@@ -2524,7 +2524,7 @@ public void testNameNodeCreateSnapshotTrashRootOnStartup()
MiniDFSCluster cluster =
new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
try {
- final DistributedFileSystem dfs = cluster.getFileSystem();
+ DistributedFileSystem dfs = cluster.getFileSystem();
Review comment:
nit: add one more space before this line for alignment.
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Issue Time Tracking
-------------------
Worklog Id: (was: 547784)
Time Spent: 20m (was: 10m)
> Ensure snapshot root trash provisioning happens only post safe mode exit
> ------------------------------------------------------------------------
>
> Key: HDFS-15820
> URL: https://issues.apache.org/jira/browse/HDFS-15820
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Shashikant Banerjee
> Assignee: Shashikant Banerjee
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Currently, on namenode startup, snapshot trash root provisioning starts as
> along with trash emptier service but namenode might not be out of safe mode
> by then. This can fail the snapshot trash dir creation thereby crashing the
> namenode. The idea here is to trigger snapshot trash provisioning only post
> safe mode exit.
> {code:java}
> 2021-02-04 11:23:47,323 ERROR
> org.apache.hadoop.hdfs.server.namenode.NameNode: Error encountered requiring
> NN shutdown. Shutting down immediately.
> org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create
> directory /upgrade/.Trash. Name node is in safe mode.
> The reported blocks 0 needs additional 1383 blocks to reach the threshold
> 0.9990 of total blocks 1385.
> The number of live datanodes 0 needs an additional 1 live datanodes to reach
> the minimum number 1.
> Safe mode will be turned off automatically once the thresholds have been
> reached. NamenodeHostName:quasar-brabeg-5.quasar-brabeg.root.hwx.site
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.newSafemodeException(FSNamesystem.java:1542)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkNameNodeSafeMode(FSNamesystem.java:1529)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:3288)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkAndProvisionSnapshotTrashRoots(FSNamesystem.java:8269)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.startActiveServices(NameNode.java:1939)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.ActiveState.enterState(ActiveState.java:61)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:967)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:936)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1673)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1740)
> 2021-02-04 11:23:47,334 INFO org.apache.hadoop.util.ExitUtil: Exiting with
> status 1: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot
> create directory /upgrade/.Trash. Name node is in safe mode.
> {code}
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