busbey commented on a change in pull request #623: HBASE-22749: Distributed MOB
compactions
URL: https://github.com/apache/hbase/pull/623#discussion_r336255785
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File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/DefaultMobStoreCompactor.java
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@@ -183,105 +270,166 @@ protected boolean performCompaction(FileDetails fd,
InternalScanner scanner, Cel
boolean hasMore;
Path path = MobUtils.getMobFamilyPath(conf, store.getTableName(),
store.getColumnFamilyName());
byte[] fileName = null;
- StoreFileWriter mobFileWriter = null, delFileWriter = null;
- long mobCells = 0, deleteMarkersCount = 0;
+ StoreFileWriter mobFileWriter = null;
+ long mobCells = 0;
long cellsCountCompactedToMob = 0, cellsCountCompactedFromMob = 0;
long cellsSizeCompactedToMob = 0, cellsSizeCompactedFromMob = 0;
boolean finished = false;
+
ScannerContext scannerContext =
ScannerContext.newBuilder().setBatchLimit(compactionKVMax).build();
throughputController.start(compactionName);
- KeyValueScanner kvs = (scanner instanceof KeyValueScanner)?
(KeyValueScanner)scanner : null;
- long shippedCallSizeLimit = (long) numofFilesToCompact *
this.store.getColumnFamilyDescriptor().getBlocksize();
+ KeyValueScanner kvs = (scanner instanceof KeyValueScanner) ?
(KeyValueScanner) scanner : null;
+ long shippedCallSizeLimit =
+ (long) numofFilesToCompact *
this.store.getColumnFamilyDescriptor().getBlocksize();
+
+ MobCell mobCell = null;
try {
try {
// If the mob file writer could not be created, directly write the
cell to the store file.
mobFileWriter = mobStore.createWriterInTmp(new Date(fd.latestPutTs),
fd.maxKeyCount,
compactionCompression, store.getRegionInfo().getStartKey(), true);
fileName = Bytes.toBytes(mobFileWriter.getPath().getName());
} catch (IOException e) {
- LOG.warn("Failed to create mob writer, "
- + "we will continue the compaction by writing MOB cells
directly in store files", e);
+ // Bailing out
Review comment:
That's true. For us to make progress in the old approach we'd need to have
some kind of odd configuration, like different quotas or perms on the mobdir
compared to active. I can see how drawing attention while staying in a holding
pattern has advantages over bouncing bunch of data around.
We should make sure to release note this behavior change.
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