tibrewalpratik17 commented on code in PR #12317:
URL: https://github.com/apache/pinot/pull/12317#discussion_r1475797609
##########
pinot-common/src/main/java/org/apache/pinot/common/utils/fetcher/BaseSegmentFetcher.java:
##########
@@ -109,6 +112,38 @@ public File fetchUntarSegmentToLocalStreamed(URI uri, File
dest, long rateLimit,
throw new UnsupportedOperationException();
}
+ // Download segment to a local location with retries.
+ @Override
+ public boolean fetchSegmentToLocal(String segmentName, File dest,
HelixManager helixManager, String downloadScheme)
+ throws Exception {
+ try {
+ int attempt =
+ RetryPolicies.exponentialBackoffRetryPolicy(_retryCount,
_retryWaitMs, _retryDelayScaleFactor).attempt(() -> {
+ // First find servers hosting the segment in ONLINE state.
+ List<URI> peerSegmentURIs =
+ PeerServerSegmentFinder.getPeerServerURIs(segmentName,
downloadScheme, helixManager);
+ // Shuffle the list of URIs.
+ Collections.shuffle(peerSegmentURIs);
+ // Next get through the list of URIs to fetch the segment until
success.
+ for (URI uri : peerSegmentURIs) {
+ try {
+ fetchSegmentToLocalWithoutRetry(uri, dest);
Review Comment:
This will increase this function count from present 3 to `3 * number of peer
servers`. Is that desired?
##########
pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/RealtimeTableDataManager.java:
##########
@@ -658,11 +656,10 @@ private void downloadSegmentFromPeer(String segmentName,
String downloadScheme,
try {
tempRootDir = getTmpSegmentDataDir("tmp-" + segmentName + "." +
System.currentTimeMillis());
File segmentTarFile = new File(tempRootDir, segmentName +
TarGzCompressionUtils.TAR_GZ_FILE_EXTENSION);
- // First find servers hosting the segment in a ONLINE state.
- List<URI> peerSegmentURIs =
PeerServerSegmentFinder.getPeerServerURIs(segmentName, downloadScheme,
_helixManager);
// Next download the segment from a randomly chosen server using
configured scheme.
-
SegmentFetcherFactory.getSegmentFetcher(downloadScheme).fetchSegmentToLocal(peerSegmentURIs,
segmentTarFile);
- _logger.info("Fetched segment {} from: {} to: {} of size: {}",
segmentName, peerSegmentURIs, segmentTarFile,
+ SegmentFetcherFactory.getSegmentFetcher(downloadScheme)
+ .fetchSegmentToLocal(segmentName, segmentTarFile, _helixManager,
downloadScheme);
Review Comment:
Do you think it's a good idea to expose helixManager in SegmentFetcher
logic? Can we keep the logic of updating peerSegmentURIs with retries here
itself?
Segment fetcher should just fetch segment given a URI.
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