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From "Chris Westin (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DRILL-1976) Possible Memory Leak in drill jdbc client when dealing with wide columns (5000 chars long)
Date Fri, 18 Sep 2015 02:01:04 GMT

     [ https://issues.apache.org/jira/browse/DRILL-1976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Westin resolved DRILL-1976.
---------------------------------
    Resolution: Fixed

> Possible Memory Leak in drill jdbc client when dealing with wide columns (5000 chars
long)
> ------------------------------------------------------------------------------------------
>
>                 Key: DRILL-1976
>                 URL: https://issues.apache.org/jira/browse/DRILL-1976
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>            Reporter: Rahul Challapalli
>            Assignee: Chris Westin
>             Fix For: 1.2.0
>
>         Attachments: wide-strings-mod.sh, wide-strings.sh
>
>
> git.commit.id.abbrev=b491cdb
> I am seeing an execution failure when I execute the same query multiple times (<10).
The data file contains 9 columns out of which 7 are wide strings (4000-5000 chars long)
> {code}
> select ws.*, sub.str_var str_var1 from widestrings ws INNER JOIN (select str_var, max(tinyint_var)
max_ti from widestrings group by str_var) sub on ws.tinyint_var = sub.max_ti
> {code}
> Below are my memory settings :
> {code}
> DRILL_MAX_DIRECT_MEMORY="32G"
> DRILL_MAX_HEAP="4G"
> {code}
> Error From the JDBC client
> {code}
> select ws.*, sub.str_var str_var1 from widestrings ws INNER JOIN (select str_var, max(tinyint_var)
max_ti from widestrings group by str_var) sub on ws.tinyint_var = sub.max_ti
> Exception in pipeline.  Closing channel between local /10.10.100.190:38179 and remote
qa-node191.qa.lab/10.10.100.191:31010
> io.netty.handler.codec.DecoderException: java.lang.OutOfMemoryError: Direct buffer memory
> 	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:151)
> 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
> 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
> 	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
> 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
> 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
> 	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)
> 	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130)
> 	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> 	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> 	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> 	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> 	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.OutOfMemoryError: Direct buffer memory
> 	at java.nio.Bits.reserveMemory(Bits.java:658)
> 	at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
> 	at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:306)
> 	at io.netty.buffer.PoolArena$DirectArena.newUnpooledChunk(PoolArena.java:443)
> 	at io.netty.buffer.PoolArena.allocateHuge(PoolArena.java:187)
> 	at io.netty.buffer.PoolArena.allocate(PoolArena.java:165)
> 	at io.netty.buffer.PoolArena.reallocate(PoolArena.java:280)
> 	at io.netty.buffer.PooledByteBuf.capacity(PooledByteBuf.java:110)
> 	at io.netty.buffer.AbstractByteBuf.ensureWritable(AbstractByteBuf.java:251)
> 	at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:849)
> 	at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:841)
> 	at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:831)
> 	at io.netty.buffer.WrappedByteBuf.writeBytes(WrappedByteBuf.java:600)
> 	at io.netty.buffer.UnsafeDirectLittleEndian.writeBytes(UnsafeDirectLittleEndian.java:25)
> 	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:144)
> 	... 13 more
> Channel closed between local /10.10.100.190:38179 and remote qa-node191.qa.lab/10.10.100.191:31010
> Channel is closed, discarding remaining 255231 byte(s) in buffer.
> {code}
> The logs



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