binlijin created HBASE-8720:
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Summary: Only one snapshot region tasks that can run at a time
Key: HBASE-8720
URL: https://issues.apache.org/jira/browse/HBASE-8720
Project: HBase
Issue Type: Bug
Components: snapshots
Affects Versions: 0.95.0, 0.94.8
Reporter: binlijin
{code}
SnapshotSubprocedurePool(String name, Configuration conf) {
// configure the executor service
long keepAlive = conf.getLong(
RegionServerSnapshotManager.SNAPSHOT_TIMEOUT_MILLIS_KEY,
RegionServerSnapshotManager.SNAPSHOT_TIMEOUT_MILLIS_DEFAULT);
int threads = conf.getInt(CONCURENT_SNAPSHOT_TASKS_KEY,
DEFAULT_CONCURRENT_SNAPSHOT_TASKS);
this.name = name;
executor = new ThreadPoolExecutor(1, threads, keepAlive,
TimeUnit.MILLISECONDS,
new LinkedBlockingQueue<Runnable>(), new DaemonThreadFactory("rs("
+ name + ")-snapshot-pool"));
taskPool = new ExecutorCompletionService<Void>(executor);
}
{code}
ThreadPoolExecutor：
corePoolSize：1
maximumPoolSize：3
workQueue：LinkedBlockingQueue，unlimited
so when a new task submit to the ThreadPoolExecutor, if there is a task is
running, the new task is queued in the queue, so all snapshot region tasks
execute one by one.
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