Indhumathi27 commented on a change in pull request #4076:
URL: https://github.com/apache/carbondata/pull/4076#discussion_r561714909
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File path: core/src/main/java/org/apache/carbondata/core/view/MVProvider.java
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@@ -569,14 +568,31 @@ private synchronized void touchMDTFile() throws
IOException {
FileFactory.createDirectoryAndSetPermission(this.systemDirectory,
new FsPermission(FsAction.ALL, FsAction.ALL, FsAction.ALL));
}
- CarbonFile schemaIndexFile =
FileFactory.getCarbonFile(this.schemaIndexFilePath);
- if (schemaIndexFile.exists()) {
- schemaIndexFile.delete();
+ // two or more JVM process can access this method to update last
modified time at same
+ // time causing exception. So take a system level lock on system folder
and update
+ // last modified time of schema index file
+ ICarbonLock systemDirLock = CarbonLockFactory
+ .getSystemLevelCarbonLockObj(this.systemDirectory,
+ LockUsage.MATERIALIZED_VIEW_STATUS_LOCK);
+ boolean locked = false;
+ try {
+ locked = systemDirLock.lockWithRetries();
+ if (locked) {
+ CarbonFile schemaIndexFile =
FileFactory.getCarbonFile(this.schemaIndexFilePath);
+ if (schemaIndexFile.exists()) {
+ schemaIndexFile.delete();
+ }
+ schemaIndexFile.createNewFile(new FsPermission(FsAction.ALL,
FsAction.ALL, FsAction.ALL));
+ this.lastModifiedTime = schemaIndexFile.getLastModifiedTime();
+ } else {
+ LOG.warn("Unable to get Lock to refresh schema index last modified
time");
Review comment:
Not needed, As next operation will compare last modified time and update
it
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