samperson1997 commented on a change in pull request #1384:
URL: https://github.com/apache/incubator-iotdb/pull/1384#discussion_r443366958
##########
File path: server/src/main/java/org/apache/iotdb/db/metadata/MManager.java
##########
@@ -1702,4 +1766,31 @@ public void cacheSchema(String path, MeasurementSchema
schema) {
mRemoteSchemaCache.put(path, schema);
}
}
+
+ private void checkMTreeModified() {
+ if (System.currentTimeMillis() - logFile.lastModified() < 60 * 60 * 1000) {
+ logger.info("MTree snapshot is not created because of active
modification");
+ } else if (logWriter.getLineNumber() - lastSnapshotLogLineNumber <
mtreeSnapshotInterval) {
+ logger.info("MTree snapshot need not be created");
+ } else {
+ lock.writeLock().lock();
+ logger.info("Start creating MTree snapshot. This may take a while...");
+ try {
+ mtree.serializeTo(mtreeSnapshotTmpPath, logWriter.getLineNumber());
+ lastSnapshotLogLineNumber = logWriter.getLineNumber();
+ File tmpFile =
SystemFileFactory.INSTANCE.getFile(mtreeSnapshotTmpPath);
+ File snapshotFile =
SystemFileFactory.INSTANCE.getFile(mtreeSnapshotPath);
+ if (snapshotFile.exists()) {
+ Files.delete(snapshotFile.toPath());
+ }
+ if (tmpFile.renameTo(snapshotFile)) {
+ logger.info("Finish creating MTree snapshot to {}.",
mtreeSnapshotPath);
+ }
+ } catch (IOException e) {
+ logger.warn("Failed to create MTree snapshot to {}",
mtreeSnapshotPath, e);
Review comment:
No need. It will be removed when restarting
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