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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2018/12/26 15:36:31 UTC
[GitHub] azagrebin commented on a change in pull request #7351:
[FLINK-11008][State Backends,
Checkpointing]SpeedUp upload state files using multithread
azagrebin commented on a change in pull request #7351: [FLINK-11008][State Backends, Checkpointing]SpeedUp upload state files using multithread
URL: https://github.com/apache/flink/pull/7351#discussion_r244009608
##########
File path: flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/snapshot/RocksIncrementalSnapshotStrategy.java
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@@ -403,85 +409,6 @@ private void cleanupIncompleteSnapshot(@Nonnull List<StateObject> statesToDiscar
}
}
- private void uploadSstFiles(
- @Nonnull Map<StateHandleID, StreamStateHandle> sstFiles,
- @Nonnull Map<StateHandleID, StreamStateHandle> miscFiles) throws Exception {
-
- // write state data
- Preconditions.checkState(localBackupDirectory.exists());
-
- FileStatus[] fileStatuses = localBackupDirectory.listStatus();
- if (fileStatuses != null) {
- for (FileStatus fileStatus : fileStatuses) {
- final Path filePath = fileStatus.getPath();
- final String fileName = filePath.getName();
- final StateHandleID stateHandleID = new StateHandleID(fileName);
-
- if (fileName.endsWith(SST_FILE_SUFFIX)) {
- final boolean existsAlready =
- baseSstFiles != null && baseSstFiles.contains(stateHandleID);
-
- if (existsAlready) {
- // we introduce a placeholder state handle, that is replaced with the
- // original from the shared state registry (created from a previous checkpoint)
- sstFiles.put(
- stateHandleID,
- new PlaceholderStreamStateHandle());
- } else {
- sstFiles.put(stateHandleID, uploadLocalFileToCheckpointFs(filePath));
Review comment:
I think this logic of sst/placeholders/misc file separation belongs here.
`RocksDbStateDataTransfer` should be responsible only for the upload.
What if instead of calling `uploadLocalFileToCheckpointFs`, we fill `sstFilesToUpload` and `miscFilesToUpload` of `Map<StateHandleID, Path>` in this loop and then call `RocksDbStateDataTransfer.uploadStateFiles` for each map? This `uploadStateFiles` could return `Map<StateHandleID, StreamStateHandle>` which could be put into the final `sstFiles`/`miscFiles`.
I think `ConcurrentHashMap` is not needed then.
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