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HBASE-26814 Default StoreHotnessProtector to off, with logs to guide when to turn it on #4194

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merged 2 commits into from
Mar 9, 2022
+12 −2
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HBASE-26814 Default StoreHotnessProtector to off, with logs to guide when to turn it on #4194

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HBASE-26814 Default StoreHotnessProtector to off, with logs to guide …
bbeaudreault Mar 9, 2022
93c753c
log once
bbeaudreault Mar 9, 2022
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14 changes: 12 additions & 2 deletions ...er/src/main/java/org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,6 @@
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
import org.apache.yetus.audience.InterfaceAudience;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

Expand Down Expand Up @@ -63,14 +62,18 @@
@InterfaceAudience.Private
public class StoreHotnessProtector {
private static final Logger LOG = LoggerFactory.getLogger(StoreHotnessProtector.class);

// We want to log just once so that users are aware of this tool
private static volatile boolean loggedDisableMessage;

private volatile int parallelPutToStoreThreadLimit;

private volatile int parallelPreparePutToStoreThreadLimit;
public final static String PARALLEL_PUT_STORE_THREADS_LIMIT =
"hbase.region.store.parallel.put.limit";
public final static String PARALLEL_PREPARE_PUT_STORE_MULTIPLIER =
"hbase.region.store.parallel.prepare.put.multiplier";
private final static int DEFAULT_PARALLEL_PUT_STORE_THREADS_LIMIT = 10;
private final static int DEFAULT_PARALLEL_PUT_STORE_THREADS_LIMIT = 0;
private volatile int parallelPutToStoreThreadLimitCheckMinColumnCount;
public final static String PARALLEL_PUT_STORE_THREADS_LIMIT_MIN_COLUMN_COUNT =
"hbase.region.store.parallel.put.limit.min.column.count";
Expand All @@ -95,6 +98,13 @@ public void init(Configuration conf) {
conf.getInt(PARALLEL_PUT_STORE_THREADS_LIMIT_MIN_COLUMN_COUNT,
DEFAULT_PARALLEL_PUT_STORE_THREADS_LIMIT_MIN_COLUMN_NUM);

if (!isEnable() && !loggedDisableMessage) {
loggedDisableMessage = true;

LOG.info("StoreHotnessProtector is disabled. Set {} > 0 to enable, "
+ "which may help mitigate load under heavy write pressure.",
PARALLEL_PUT_STORE_THREADS_LIMIT);
}
}

public void update(Configuration conf) {
Expand Down