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Posted to commits@hbase.apache.org by gi...@apache.org on 2018/03/21 14:54:13 UTC
[12/51] [partial] hbase-site git commit: Published site at
8ab7b20f48951d77945181024f5e15842bc253c4.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/6eb695c8/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html
index 9971079..03c8b000 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html
@@ -49,1067 +49,1082 @@
<span class="sourceLineNo">041</span>import org.apache.hadoop.fs.Path;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.HConstants;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.util.FSUtils;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.util.HasThread;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.wal.FSHLogProvider;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.wal.WALEdit;<a name="line.51"></a>
-<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.wal.WALKeyImpl;<a name="line.52"></a>
-<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.wal.WALProvider.Writer;<a name="line.53"></a>
-<span class="sourceLineNo">054</span>import org.apache.hadoop.hdfs.DFSOutputStream;<a name="line.54"></a>
-<span class="sourceLineNo">055</span>import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;<a name="line.55"></a>
-<span class="sourceLineNo">056</span>import org.apache.hadoop.hdfs.protocol.DatanodeInfo;<a name="line.56"></a>
-<span class="sourceLineNo">057</span>import org.apache.htrace.core.TraceScope;<a name="line.57"></a>
-<span class="sourceLineNo">058</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.58"></a>
-<span class="sourceLineNo">059</span>import org.slf4j.Logger;<a name="line.59"></a>
-<span class="sourceLineNo">060</span>import org.slf4j.LoggerFactory;<a name="line.60"></a>
-<span class="sourceLineNo">061</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.61"></a>
-<span class="sourceLineNo">062</span><a name="line.62"></a>
-<span class="sourceLineNo">063</span>/**<a name="line.63"></a>
-<span class="sourceLineNo">064</span> * The default implementation of FSWAL.<a name="line.64"></a>
-<span class="sourceLineNo">065</span> */<a name="line.65"></a>
-<span class="sourceLineNo">066</span>@InterfaceAudience.Private<a name="line.66"></a>
-<span class="sourceLineNo">067</span>public class FSHLog extends AbstractFSWAL<Writer> {<a name="line.67"></a>
-<span class="sourceLineNo">068</span> // IMPLEMENTATION NOTES:<a name="line.68"></a>
-<span class="sourceLineNo">069</span> //<a name="line.69"></a>
-<span class="sourceLineNo">070</span> // At the core is a ring buffer. Our ring buffer is the LMAX Disruptor. It tries to<a name="line.70"></a>
-<span class="sourceLineNo">071</span> // minimize synchronizations and volatile writes when multiple contending threads as is the case<a name="line.71"></a>
-<span class="sourceLineNo">072</span> // here appending and syncing on a single WAL. The Disruptor is configured to handle multiple<a name="line.72"></a>
-<span class="sourceLineNo">073</span> // producers but it has one consumer only (the producers in HBase are IPC Handlers calling append<a name="line.73"></a>
-<span class="sourceLineNo">074</span> // and then sync). The single consumer/writer pulls the appends and syncs off the ring buffer.<a name="line.74"></a>
-<span class="sourceLineNo">075</span> // When a handler calls sync, it is given back a future. The producer 'blocks' on the future so<a name="line.75"></a>
-<span class="sourceLineNo">076</span> // it does not return until the sync completes. The future is passed over the ring buffer from<a name="line.76"></a>
-<span class="sourceLineNo">077</span> // the producer/handler to the consumer thread where it does its best to batch up the producer<a name="line.77"></a>
-<span class="sourceLineNo">078</span> // syncs so one WAL sync actually spans multiple producer sync invocations. How well the<a name="line.78"></a>
-<span class="sourceLineNo">079</span> // batching works depends on the write rate; i.e. we tend to batch more in times of<a name="line.79"></a>
-<span class="sourceLineNo">080</span> // high writes/syncs.<a name="line.80"></a>
-<span class="sourceLineNo">081</span> //<a name="line.81"></a>
-<span class="sourceLineNo">082</span> // Calls to append now also wait until the append has been done on the consumer side of the<a name="line.82"></a>
-<span class="sourceLineNo">083</span> // disruptor. We used to not wait but it makes the implementation easier to grok if we have<a name="line.83"></a>
-<span class="sourceLineNo">084</span> // the region edit/sequence id after the append returns.<a name="line.84"></a>
-<span class="sourceLineNo">085</span> //<a name="line.85"></a>
-<span class="sourceLineNo">086</span> // TODO: Handlers need to coordinate appending AND syncing. Can we have the threads contend<a name="line.86"></a>
-<span class="sourceLineNo">087</span> // once only? Probably hard given syncs take way longer than an append.<a name="line.87"></a>
-<span class="sourceLineNo">088</span> //<a name="line.88"></a>
-<span class="sourceLineNo">089</span> // The consumer threads pass the syncs off to multiple syncing threads in a round robin fashion<a name="line.89"></a>
-<span class="sourceLineNo">090</span> // to ensure we keep up back-to-back FS sync calls (FS sync calls are the long poll writing the<a name="line.90"></a>
-<span class="sourceLineNo">091</span> // WAL). The consumer thread passes the futures to the sync threads for it to complete<a name="line.91"></a>
-<span class="sourceLineNo">092</span> // the futures when done.<a name="line.92"></a>
-<span class="sourceLineNo">093</span> //<a name="line.93"></a>
-<span class="sourceLineNo">094</span> // The 'sequence' in the below is the sequence of the append/sync on the ringbuffer. It<a name="line.94"></a>
-<span class="sourceLineNo">095</span> // acts as a sort-of transaction id. It is always incrementing.<a name="line.95"></a>
-<span class="sourceLineNo">096</span> //<a name="line.96"></a>
-<span class="sourceLineNo">097</span> // The RingBufferEventHandler class hosts the ring buffer consuming code. The threads that<a name="line.97"></a>
-<span class="sourceLineNo">098</span> // do the actual FS sync are implementations of SyncRunner. SafePointZigZagLatch is a<a name="line.98"></a>
-<span class="sourceLineNo">099</span> // synchronization class used to halt the consumer at a safe point -- just after all outstanding<a name="line.99"></a>
-<span class="sourceLineNo">100</span> // syncs and appends have completed -- so the log roller can swap the WAL out under it.<a name="line.100"></a>
-<span class="sourceLineNo">101</span> //<a name="line.101"></a>
-<span class="sourceLineNo">102</span> // We use ring buffer sequence as txid of FSWALEntry and SyncFuture.<a name="line.102"></a>
-<span class="sourceLineNo">103</span> private static final Logger LOG = LoggerFactory.getLogger(FSHLog.class);<a name="line.103"></a>
-<span class="sourceLineNo">104</span><a name="line.104"></a>
-<span class="sourceLineNo">105</span> /**<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * The nexus at which all incoming handlers meet. Does appends and sync with an ordering. Appends<a name="line.106"></a>
-<span class="sourceLineNo">107</span> * and syncs are each put on the ring which means handlers need to smash up against the ring twice<a name="line.107"></a>
-<span class="sourceLineNo">108</span> * (can we make it once only? ... maybe not since time to append is so different from time to sync<a name="line.108"></a>
-<span class="sourceLineNo">109</span> * and sometimes we don't want to sync or we want to async the sync). The ring is where we make<a name="line.109"></a>
-<span class="sourceLineNo">110</span> * sure of our ordering and it is also where we do batching up of handler sync calls.<a name="line.110"></a>
-<span class="sourceLineNo">111</span> */<a name="line.111"></a>
-<span class="sourceLineNo">112</span> private final Disruptor<RingBufferTruck> disruptor;<a name="line.112"></a>
-<span class="sourceLineNo">113</span><a name="line.113"></a>
-<span class="sourceLineNo">114</span> /**<a name="line.114"></a>
-<span class="sourceLineNo">115</span> * This fellow is run by the above appendExecutor service but it is all about batching up appends<a name="line.115"></a>
-<span class="sourceLineNo">116</span> * and syncs; it may shutdown without cleaning out the last few appends or syncs. To guard against<a name="line.116"></a>
-<span class="sourceLineNo">117</span> * this, keep a reference to this handler and do explicit close on way out to make sure all<a name="line.117"></a>
-<span class="sourceLineNo">118</span> * flushed out before we exit.<a name="line.118"></a>
-<span class="sourceLineNo">119</span> */<a name="line.119"></a>
-<span class="sourceLineNo">120</span> private final RingBufferEventHandler ringBufferEventHandler;<a name="line.120"></a>
-<span class="sourceLineNo">121</span><a name="line.121"></a>
-<span class="sourceLineNo">122</span> /**<a name="line.122"></a>
-<span class="sourceLineNo">123</span> * FSDataOutputStream associated with the current SequenceFile.writer<a name="line.123"></a>
-<span class="sourceLineNo">124</span> */<a name="line.124"></a>
-<span class="sourceLineNo">125</span> private FSDataOutputStream hdfs_out;<a name="line.125"></a>
-<span class="sourceLineNo">126</span><a name="line.126"></a>
-<span class="sourceLineNo">127</span> // All about log rolling if not enough replicas outstanding.<a name="line.127"></a>
-<span class="sourceLineNo">128</span><a name="line.128"></a>
-<span class="sourceLineNo">129</span> // Minimum tolerable replicas, if the actual value is lower than it, rollWriter will be triggered<a name="line.129"></a>
-<span class="sourceLineNo">130</span> private final int minTolerableReplication;<a name="line.130"></a>
-<span class="sourceLineNo">131</span><a name="line.131"></a>
-<span class="sourceLineNo">132</span> // If live datanode count is lower than the default replicas value,<a name="line.132"></a>
-<span class="sourceLineNo">133</span> // RollWriter will be triggered in each sync(So the RollWriter will be<a name="line.133"></a>
-<span class="sourceLineNo">134</span> // triggered one by one in a short time). Using it as a workaround to slow<a name="line.134"></a>
-<span class="sourceLineNo">135</span> // down the roll frequency triggered by checkLowReplication().<a name="line.135"></a>
-<span class="sourceLineNo">136</span> private final AtomicInteger consecutiveLogRolls = new AtomicInteger(0);<a name="line.136"></a>
-<span class="sourceLineNo">137</span><a name="line.137"></a>
-<span class="sourceLineNo">138</span> private final int lowReplicationRollLimit;<a name="line.138"></a>
-<span class="sourceLineNo">139</span><a name="line.139"></a>
-<span class="sourceLineNo">140</span> // If consecutiveLogRolls is larger than lowReplicationRollLimit,<a name="line.140"></a>
-<span class="sourceLineNo">141</span> // then disable the rolling in checkLowReplication().<a name="line.141"></a>
-<span class="sourceLineNo">142</span> // Enable it if the replications recover.<a name="line.142"></a>
-<span class="sourceLineNo">143</span> private volatile boolean lowReplicationRollEnabled = true;<a name="line.143"></a>
-<span class="sourceLineNo">144</span><a name="line.144"></a>
-<span class="sourceLineNo">145</span> /** Number of log close errors tolerated before we abort */<a name="line.145"></a>
-<span class="sourceLineNo">146</span> private final int closeErrorsTolerated;<a name="line.146"></a>
+<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.regionserver.HRegion;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.util.FSUtils;<a name="line.48"></a>
+<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.util.HasThread;<a name="line.49"></a>
+<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.50"></a>
+<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.wal.FSHLogProvider;<a name="line.51"></a>
+<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.wal.WALEdit;<a name="line.52"></a>
+<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.wal.WALKeyImpl;<a name="line.53"></a>
+<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.wal.WALProvider.Writer;<a name="line.54"></a>
+<span class="sourceLineNo">055</span>import org.apache.hadoop.hdfs.DFSOutputStream;<a name="line.55"></a>
+<span class="sourceLineNo">056</span>import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;<a name="line.56"></a>
+<span class="sourceLineNo">057</span>import org.apache.hadoop.hdfs.protocol.DatanodeInfo;<a name="line.57"></a>
+<span class="sourceLineNo">058</span>import org.apache.htrace.core.TraceScope;<a name="line.58"></a>
+<span class="sourceLineNo">059</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.59"></a>
+<span class="sourceLineNo">060</span>import org.slf4j.Logger;<a name="line.60"></a>
+<span class="sourceLineNo">061</span>import org.slf4j.LoggerFactory;<a name="line.61"></a>
+<span class="sourceLineNo">062</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.62"></a>
+<span class="sourceLineNo">063</span><a name="line.63"></a>
+<span class="sourceLineNo">064</span>/**<a name="line.64"></a>
+<span class="sourceLineNo">065</span> * The default implementation of FSWAL.<a name="line.65"></a>
+<span class="sourceLineNo">066</span> */<a name="line.66"></a>
+<span class="sourceLineNo">067</span>@InterfaceAudience.Private<a name="line.67"></a>
+<span class="sourceLineNo">068</span>public class FSHLog extends AbstractFSWAL<Writer> {<a name="line.68"></a>
+<span class="sourceLineNo">069</span> // IMPLEMENTATION NOTES:<a name="line.69"></a>
+<span class="sourceLineNo">070</span> //<a name="line.70"></a>
+<span class="sourceLineNo">071</span> // At the core is a ring buffer. Our ring buffer is the LMAX Disruptor. It tries to<a name="line.71"></a>
+<span class="sourceLineNo">072</span> // minimize synchronizations and volatile writes when multiple contending threads as is the case<a name="line.72"></a>
+<span class="sourceLineNo">073</span> // here appending and syncing on a single WAL. The Disruptor is configured to handle multiple<a name="line.73"></a>
+<span class="sourceLineNo">074</span> // producers but it has one consumer only (the producers in HBase are IPC Handlers calling append<a name="line.74"></a>
+<span class="sourceLineNo">075</span> // and then sync). The single consumer/writer pulls the appends and syncs off the ring buffer.<a name="line.75"></a>
+<span class="sourceLineNo">076</span> // When a handler calls sync, it is given back a future. The producer 'blocks' on the future so<a name="line.76"></a>
+<span class="sourceLineNo">077</span> // it does not return until the sync completes. The future is passed over the ring buffer from<a name="line.77"></a>
+<span class="sourceLineNo">078</span> // the producer/handler to the consumer thread where it does its best to batch up the producer<a name="line.78"></a>
+<span class="sourceLineNo">079</span> // syncs so one WAL sync actually spans multiple producer sync invocations. How well the<a name="line.79"></a>
+<span class="sourceLineNo">080</span> // batching works depends on the write rate; i.e. we tend to batch more in times of<a name="line.80"></a>
+<span class="sourceLineNo">081</span> // high writes/syncs.<a name="line.81"></a>
+<span class="sourceLineNo">082</span> //<a name="line.82"></a>
+<span class="sourceLineNo">083</span> // Calls to append now also wait until the append has been done on the consumer side of the<a name="line.83"></a>
+<span class="sourceLineNo">084</span> // disruptor. We used to not wait but it makes the implementation easier to grok if we have<a name="line.84"></a>
+<span class="sourceLineNo">085</span> // the region edit/sequence id after the append returns.<a name="line.85"></a>
+<span class="sourceLineNo">086</span> //<a name="line.86"></a>
+<span class="sourceLineNo">087</span> // TODO: Handlers need to coordinate appending AND syncing. Can we have the threads contend<a name="line.87"></a>
+<span class="sourceLineNo">088</span> // once only? Probably hard given syncs take way longer than an append.<a name="line.88"></a>
+<span class="sourceLineNo">089</span> //<a name="line.89"></a>
+<span class="sourceLineNo">090</span> // The consumer threads pass the syncs off to multiple syncing threads in a round robin fashion<a name="line.90"></a>
+<span class="sourceLineNo">091</span> // to ensure we keep up back-to-back FS sync calls (FS sync calls are the long poll writing the<a name="line.91"></a>
+<span class="sourceLineNo">092</span> // WAL). The consumer thread passes the futures to the sync threads for it to complete<a name="line.92"></a>
+<span class="sourceLineNo">093</span> // the futures when done.<a name="line.93"></a>
+<span class="sourceLineNo">094</span> //<a name="line.94"></a>
+<span class="sourceLineNo">095</span> // The 'sequence' in the below is the sequence of the append/sync on the ringbuffer. It<a name="line.95"></a>
+<span class="sourceLineNo">096</span> // acts as a sort-of transaction id. It is always incrementing.<a name="line.96"></a>
+<span class="sourceLineNo">097</span> //<a name="line.97"></a>
+<span class="sourceLineNo">098</span> // The RingBufferEventHandler class hosts the ring buffer consuming code. The threads that<a name="line.98"></a>
+<span class="sourceLineNo">099</span> // do the actual FS sync are implementations of SyncRunner. SafePointZigZagLatch is a<a name="line.99"></a>
+<span class="sourceLineNo">100</span> // synchronization class used to halt the consumer at a safe point -- just after all outstanding<a name="line.100"></a>
+<span class="sourceLineNo">101</span> // syncs and appends have completed -- so the log roller can swap the WAL out under it.<a name="line.101"></a>
+<span class="sourceLineNo">102</span> //<a name="line.102"></a>
+<span class="sourceLineNo">103</span> // We use ring buffer sequence as txid of FSWALEntry and SyncFuture.<a name="line.103"></a>
+<span class="sourceLineNo">104</span> private static final Logger LOG = LoggerFactory.getLogger(FSHLog.class);<a name="line.104"></a>
+<span class="sourceLineNo">105</span><a name="line.105"></a>
+<span class="sourceLineNo">106</span> /**<a name="line.106"></a>
+<span class="sourceLineNo">107</span> * The nexus at which all incoming handlers meet. Does appends and sync with an ordering. Appends<a name="line.107"></a>
+<span class="sourceLineNo">108</span> * and syncs are each put on the ring which means handlers need to smash up against the ring twice<a name="line.108"></a>
+<span class="sourceLineNo">109</span> * (can we make it once only? ... maybe not since time to append is so different from time to sync<a name="line.109"></a>
+<span class="sourceLineNo">110</span> * and sometimes we don't want to sync or we want to async the sync). The ring is where we make<a name="line.110"></a>
+<span class="sourceLineNo">111</span> * sure of our ordering and it is also where we do batching up of handler sync calls.<a name="line.111"></a>
+<span class="sourceLineNo">112</span> */<a name="line.112"></a>
+<span class="sourceLineNo">113</span> private final Disruptor<RingBufferTruck> disruptor;<a name="line.113"></a>
+<span class="sourceLineNo">114</span><a name="line.114"></a>
+<span class="sourceLineNo">115</span> /**<a name="line.115"></a>
+<span class="sourceLineNo">116</span> * This fellow is run by the above appendExecutor service but it is all about batching up appends<a name="line.116"></a>
+<span class="sourceLineNo">117</span> * and syncs; it may shutdown without cleaning out the last few appends or syncs. To guard against<a name="line.117"></a>
+<span class="sourceLineNo">118</span> * this, keep a reference to this handler and do explicit close on way out to make sure all<a name="line.118"></a>
+<span class="sourceLineNo">119</span> * flushed out before we exit.<a name="line.119"></a>
+<span class="sourceLineNo">120</span> */<a name="line.120"></a>
+<span class="sourceLineNo">121</span> private final RingBufferEventHandler ringBufferEventHandler;<a name="line.121"></a>
+<span class="sourceLineNo">122</span><a name="line.122"></a>
+<span class="sourceLineNo">123</span> /**<a name="line.123"></a>
+<span class="sourceLineNo">124</span> * FSDataOutputStream associated with the current SequenceFile.writer<a name="line.124"></a>
+<span class="sourceLineNo">125</span> */<a name="line.125"></a>
+<span class="sourceLineNo">126</span> private FSDataOutputStream hdfs_out;<a name="line.126"></a>
+<span class="sourceLineNo">127</span><a name="line.127"></a>
+<span class="sourceLineNo">128</span> // All about log rolling if not enough replicas outstanding.<a name="line.128"></a>
+<span class="sourceLineNo">129</span><a name="line.129"></a>
+<span class="sourceLineNo">130</span> // Minimum tolerable replicas, if the actual value is lower than it, rollWriter will be triggered<a name="line.130"></a>
+<span class="sourceLineNo">131</span> private final int minTolerableReplication;<a name="line.131"></a>
+<span class="sourceLineNo">132</span><a name="line.132"></a>
+<span class="sourceLineNo">133</span> private final boolean useHsync;<a name="line.133"></a>
+<span class="sourceLineNo">134</span><a name="line.134"></a>
+<span class="sourceLineNo">135</span> // If live datanode count is lower than the default replicas value,<a name="line.135"></a>
+<span class="sourceLineNo">136</span> // RollWriter will be triggered in each sync(So the RollWriter will be<a name="line.136"></a>
+<span class="sourceLineNo">137</span> // triggered one by one in a short time). Using it as a workaround to slow<a name="line.137"></a>
+<span class="sourceLineNo">138</span> // down the roll frequency triggered by checkLowReplication().<a name="line.138"></a>
+<span class="sourceLineNo">139</span> private final AtomicInteger consecutiveLogRolls = new AtomicInteger(0);<a name="line.139"></a>
+<span class="sourceLineNo">140</span><a name="line.140"></a>
+<span class="sourceLineNo">141</span> private final int lowReplicationRollLimit;<a name="line.141"></a>
+<span class="sourceLineNo">142</span><a name="line.142"></a>
+<span class="sourceLineNo">143</span> // If consecutiveLogRolls is larger than lowReplicationRollLimit,<a name="line.143"></a>
+<span class="sourceLineNo">144</span> // then disable the rolling in checkLowReplication().<a name="line.144"></a>
+<span class="sourceLineNo">145</span> // Enable it if the replications recover.<a name="line.145"></a>
+<span class="sourceLineNo">146</span> private volatile boolean lowReplicationRollEnabled = true;<a name="line.146"></a>
<span class="sourceLineNo">147</span><a name="line.147"></a>
-<span class="sourceLineNo">148</span> private final AtomicInteger closeErrorCount = new AtomicInteger();<a name="line.148"></a>
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