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https://issues.apache.org/jira/browse/HBASE-1394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12708270#action_12708270
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stack commented on HBASE-1394:
------------------------------
Was thinking the log should be compressed. Now I think otherwise. If gzip for
instance, after the header, data is compressed in "blocks" of 32k (IIRC). That
means that since the gzip block is not tied off properly, we will lose up to
32k edits regardless of whether we hdfs sync.
> Uploads sometimes fall to 0 requests/second (Binding up on HLog#append?)
> ------------------------------------------------------------------------
>
> Key: HBASE-1394
> URL: https://issues.apache.org/jira/browse/HBASE-1394
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Priority: Critical
> Fix For: 0.20.0
>
> Attachments: loghowlongittookappendinghlog.patch
>
>
> Trying to figure why rate sometimes goes to zero.
> Studying the reginoserver, HLog#append looks like a possible culprit.
> {code}
> "IPC Server handler 7 on 60021" daemon prio=10 tid=0x000000004057dc00
> nid=0x1bc4 in Object.wait() [0x0000000043393000..0x0000000043393b80]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:485)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.writeChunk(DFSClient.java:2964)
> - locked <0x00007f9e3e449ff0> (a java.util.LinkedList)
> - locked <0x00007f9e3e449e18> (a
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream)
> at
> org.apache.hadoop.fs.FSOutputSummer.writeChecksumChunk(FSOutputSummer.java:150)
> at org.apache.hadoop.fs.FSOutputSummer.write1(FSOutputSummer.java:100)
> at org.apache.hadoop.fs.FSOutputSummer.write(FSOutputSummer.java:86)
> - locked <0x00007f9e3e449e18> (a
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream)
> at
> org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:49)
> at java.io.DataOutputStream.write(DataOutputStream.java:90)
> - locked <0x00007f9e434e5588> (a
> org.apache.hadoop.fs.FSDataOutputStream)
> at
> org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:1020)
> - locked <0x00007f9e434e55c0> (a
> org.apache.hadoop.io.SequenceFile$Writer)
> at
> org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:984)
> - locked <0x00007f9e434e55c0> (a
> org.apache.hadoop.io.SequenceFile$Writer)
> at org.apache.hadoop.hbase.regionserver.HLog.doWrite(HLog.java:565)
> at org.apache.hadoop.hbase.regionserver.HLog.append(HLog.java:521)
> - locked <0x00007f9dfa376f70> (a java.lang.Object)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.update(HRegion.java:1777)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.batchUpdate(HRegion.java:1348)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.batchUpdate(HRegion.java:1289)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.batchUpdates(HRegionServer.java:1727)
> at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:642)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:911)
> {code}
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